xspice/icm/digital, introduce d_genlut
a digital n-input x m-output look-up table gate
This commit is contained in:
Tim Edwards
rlar
parent
8ae3b84c7c
commit
fd79197fc0
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/*.......1.........2.........3.........4.........5.........6.........7.........8
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================================================================================
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FILE d_genlut/cfunc.mod
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AUTHORS
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25 Aug 2016 Tim Edwards efabless inc., San Jose, CA
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SUMMARY
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This file contains the functional description of the d_genlut
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code model.
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LICENSE
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This software is in the public domain.
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INTERFACES
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FILE ROUTINE CALLED
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CMevt.c void *cm_event_alloc()
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void *cm_event_get_ptr()
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REFERENCED FILES
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Inputs from and outputs to ARGS structure.
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NON-STANDARD FEATURES
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NONE
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===============================================================================*/
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/*=== INCLUDE FILES ====================*/
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#include <stdio.h>
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#include <ctype.h>
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#include <math.h>
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#include <string.h>
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/*=== CONSTANTS ========================*/
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/*=== MACROS ===========================*/
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/*=== LOCAL VARIABLES & TYPEDEFS =======*/
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/*=== FUNCTION PROTOTYPE DEFINITIONS ===*/
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/*==============================================================================
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FUNCTION cm_d_genlut()
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AUTHORS
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25 Aug 2016 Tim Edwards
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SUMMARY
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This function implements the d_genlut code model.
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INTERFACES
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FILE ROUTINE CALLED
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CMevt.c void *cm_event_alloc()
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void *cm_event_get_ptr()
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RETURNED VALUE
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Returns inputs and outputs via ARGS structure.
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GLOBAL VARIABLES
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NONE
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NON-STANDARD FEATURES
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NONE
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==============================================================================*/
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/*=== CM_D_LUT ROUTINE ===*/
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/************************************************
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* The following is the model for the *
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* digital n-input LUT gate *
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* *
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* Created 8/25/16 Tim Edwards *
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************************************************/
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void cm_d_genlut(ARGS)
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{
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int i, /* generic loop counter index */
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j, /* lookup index bit value */
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k, /* generic loop counter index */
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idx, /* lookup index */
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ivalid, /* check for valid input */
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isize, /* number of input ports */
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osize, /* number of output ports */
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dsize, /* number of input delay params */
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rsize, /* number of output rise delay params */
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fsize, /* number of output fall delay params */
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lsize, /* number of input load params */
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entrylen, /* length of table per output (2^isize) */
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tablelen; /* length of table (osize * (2^isize)) */
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char *table_string;
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double maxdelay, /* maximum input-to-output delay */
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testdelay;
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Digital_State_t *in, /* temp storage for input bits */
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*in_old; /* previous input for buffers */
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Digital_t *out, /* temporary output for buffers */
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*out_old, /* previous output for buffers */
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*lookup_table; /* lookup table */
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/** Retrieve size values and compute table length... **/
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isize = PORT_SIZE(in);
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osize = PORT_SIZE(out);
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if (PARAM_NULL(input_load))
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lsize = 0;
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else
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lsize = PARAM_SIZE(input_load);
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if (PARAM_NULL(input_delay))
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dsize = 0;
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else
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dsize = PARAM_SIZE(input_delay);
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if (PARAM_NULL(rise_delay))
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rsize = 0;
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else
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rsize = PARAM_SIZE(rise_delay);
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if (PARAM_NULL(fall_delay))
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fsize = 0;
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else
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fsize = PARAM_SIZE(fall_delay);
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entrylen = (1 << isize);
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tablelen = osize * entrylen;
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/*** Setup required state variables ***/
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if (INIT) { /* initial pass */
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/* allocate storage for the lookup table */
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STATIC_VAR (locdata) = calloc((size_t) tablelen, sizeof(Digital_t));
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lookup_table = STATIC_VAR (locdata);
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/* allocate storage for the outputs */
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cm_event_alloc(0, osize * (int) sizeof(Digital_t));
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cm_event_alloc(1, isize * (int) sizeof(Digital_State_t));
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/* set loading for inputs */
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for (i = 0; i < isize; i++)
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if (i < lsize)
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LOAD(in[i]) = PARAM(input_load[i]);
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else if (lsize > 0)
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LOAD(in[i]) = PARAM(input_load[lsize - 1]);
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else
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LOAD(in[i]) = 1.0e-12;
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/* retrieve storage for the outputs */
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out = out_old = (Digital_t *) cm_event_get_ptr(0, 0);
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in = in_old = (Digital_State_t *) cm_event_get_ptr(1, 0);
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/* read parameter string into lookup table */
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table_string = PARAM(table_values);
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for (idx = 0; idx < (int)strlen(table_string); idx++) {
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if (idx == tablelen)
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// If string is longer than 2^num_inputs, ignore
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// the extra values at the end
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break;
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if (table_string[idx] == '1') {
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lookup_table[idx].state = ONE;
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lookup_table[idx].strength = STRONG;
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} else if (table_string[idx] == '0') {
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lookup_table[idx].state = ZERO;
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lookup_table[idx].strength = STRONG;
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} else if (table_string[idx] == 'z') {
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lookup_table[idx].state = UNKNOWN;
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lookup_table[idx].strength = HI_IMPEDANCE;
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} else {
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lookup_table[idx].state = UNKNOWN;
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lookup_table[idx].strength = UNDETERMINED;
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}
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}
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for (; idx < tablelen; idx++) {
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// If string is shorter than 2^num_inputs, fill
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// the remainder of the lookup table with UNKNOWN
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// values.
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lookup_table[idx].state = UNKNOWN;
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lookup_table[idx].strength = UNDETERMINED;
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}
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} else { /* Retrieve previous values */
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/* retrieve lookup table */
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lookup_table = STATIC_VAR (locdata);
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/* retrieve storage for the inputs and outputs */
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out = (Digital_t *) cm_event_get_ptr(0, 0);
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out_old = (Digital_t *) cm_event_get_ptr(0, 1);
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in = (Digital_State_t *) cm_event_get_ptr(1, 0);
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in_old = (Digital_State_t *) cm_event_get_ptr(1, 1);
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}
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/*** Calculate new output value based on inputs and table ***/
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j = 1;
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idx = 0;
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ivalid = 1;
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for (k = 0; k < osize; k++) {
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out[k].state = UNKNOWN;
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out[k].strength = UNDETERMINED;
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}
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for (i = 0; i < isize; i++) {
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/* make sure this input isn't floating... */
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if (PORT_NULL(in) == FALSE) {
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/* use inputs to find index into lookup table */
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if ((in[i] = INPUT_STATE(in[i])) == UNKNOWN) {
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ivalid = 0;
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break;
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} else if (in[i] == ONE) {
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idx += j;
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}
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j <<= 1;
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} else {
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/* at least one port is floating...output is unknown */
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ivalid = 0;
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break;
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}
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}
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if (ivalid)
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for (k = 0; k < osize; k++)
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out[k] = lookup_table[idx + (k * entrylen)];
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/*** Determine analysis type and output appropriate values ***/
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if (ANALYSIS == DC) { /** DC analysis...output w/o delays **/
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for (i = 0; i < osize; i++) {
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OUTPUT_STATE(out[i]) = out[i].state;
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OUTPUT_STRENGTH(out[i]) = out[i].strength;
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}
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}
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else { /** Transient Analysis **/
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/* Determine maximum input-to-output delay */
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maxdelay = 0.0;
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for (i = 0; i < isize; i++)
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if (in[i] != in_old[i]) {
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if (i < dsize)
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testdelay = PARAM(input_delay[i]);
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else if (dsize > 0)
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testdelay = PARAM(input_delay[dsize - 1]);
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else
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testdelay = 0.0;
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if (maxdelay < testdelay)
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maxdelay = testdelay;
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}
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for (i = 0; i < osize; i++) {
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if (out[i].state != out_old[i].state) { /* output value is changing */
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OUTPUT_DELAY(out[i]) = maxdelay;
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switch (out[i].state) {
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/* fall to zero value */
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case ZERO:
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OUTPUT_STATE(out[i]) = ZERO;
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if (i < fsize)
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OUTPUT_DELAY(out[i]) += PARAM(fall_delay[i]);
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else if (fsize > 0)
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OUTPUT_DELAY(out[i]) += PARAM(fall_delay[fsize - 1]);
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else
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OUTPUT_DELAY(out[i]) += 1.0e-9;
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OUTPUT_STRENGTH(out[i]) = out[i].strength;
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break;
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/* rise to one value */
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case ONE:
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OUTPUT_STATE(out[i]) = ONE;
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if (i < rsize)
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OUTPUT_DELAY(out[i]) += PARAM(rise_delay[i]);
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else if (rsize > 0)
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OUTPUT_DELAY(out[i]) += PARAM(rise_delay[rsize - 1]);
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else
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OUTPUT_DELAY(out[i]) += 1.0e-9;
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OUTPUT_STRENGTH(out[i]) = out[i].strength;
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break;
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/* unknown output */
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default:
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OUTPUT_STATE(out[i]) = out[i].state = UNKNOWN;
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OUTPUT_STRENGTH(out[i]) = out[i].strength;
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/* based on old value, add rise or fall delay */
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if (out_old[i].state == 0) { /* add rising delay */
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if (i < rsize)
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OUTPUT_DELAY(out[i]) += PARAM(rise_delay[i]);
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else if (rsize > 0)
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OUTPUT_DELAY(out[i]) += PARAM(rise_delay[rsize - 1]);
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else
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OUTPUT_DELAY(out[i]) += 1.0e-9;
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} else { /* add falling delay */
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if (i < fsize)
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OUTPUT_DELAY(out[i]) += PARAM(fall_delay[i]);
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else if (fsize > 0)
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OUTPUT_DELAY(out[i]) += PARAM(fall_delay[fsize - 1]);
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else
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OUTPUT_DELAY(out[i]) += 1.0e-9;
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}
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break;
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}
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} else if (out[i].strength != out_old[i].strength) {
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/* output strength is changing */
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OUTPUT_STRENGTH(out[i]) = out[i].strength;
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switch (out[i].strength) {
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case STRONG:
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if (out_old[i].state == 0) { /* add falling delay */
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if (i < fsize)
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OUTPUT_DELAY(out[i]) += PARAM(fall_delay[i]);
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else if (fsize > 0)
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OUTPUT_DELAY(out[i]) += PARAM(fall_delay[fsize - 1]);
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else
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OUTPUT_DELAY(out[i]) += 1.0e-9;
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} else { /* add rising delay */
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if (i < rsize)
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OUTPUT_DELAY(out[i]) += PARAM(rise_delay[i]);
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else if (rsize > 0)
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OUTPUT_DELAY(out[i]) += PARAM(rise_delay[rsize - 1]);
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else
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OUTPUT_DELAY(out[i]) += 1.0e-9;
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}
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break;
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default:
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if (out_old[i].state == 0) { /* add rising delay */
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if (i < rsize)
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OUTPUT_DELAY(out[i]) += PARAM(rise_delay[i]);
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else if (rsize > 0)
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OUTPUT_DELAY(out[i]) += PARAM(rise_delay[rsize - 1]);
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else
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OUTPUT_DELAY(out[i]) += 1.0e-9;
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} else { /* add falling delay */
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if (i < fsize)
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OUTPUT_DELAY(out[i]) += PARAM(fall_delay[i]);
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else if (fsize > 0)
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OUTPUT_DELAY(out[i]) += PARAM(fall_delay[fsize - 1]);
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else
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OUTPUT_DELAY(out[i]) += 1.0e-9;
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}
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break;
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}
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} else { /* output value not changing */
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OUTPUT_CHANGED(out[i]) = FALSE;
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}
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}
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}
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}
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@ -0,0 +1,77 @@
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/*.......1.........2.........3.........4.........5.........6.........7.........8
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================================================================================
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AUTHORS
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25 Aug 2016 Tim Edwards efabless inc., San Jose, CA
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SUMMARY
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This file contains the interface specification file for the
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digital d_genlut code model.
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LICENSE
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This software is in the public domain.
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===============================================================================*/
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NAME_TABLE:
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C_Function_Name: cm_d_genlut
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Spice_Model_Name: d_genlut
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Description: "digital n-input x m-output look-up table gate"
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PORT_TABLE:
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Port_Name: in out
|
||||||
|
Description: "input" "output"
|
||||||
|
Direction: in out
|
||||||
|
Default_Type: d d
|
||||||
|
Allowed_Types: [d] [d]
|
||||||
|
Vector: yes yes
|
||||||
|
Vector_Bounds: - -
|
||||||
|
Null_Allowed: no no
|
||||||
|
|
||||||
|
|
||||||
|
PARAMETER_TABLE:
|
||||||
|
|
||||||
|
Parameter_Name: rise_delay fall_delay
|
||||||
|
Description: "rise delay" "fall delay"
|
||||||
|
Data_Type: real real
|
||||||
|
Default_Value: 1.0e-9 1.0e-9
|
||||||
|
Limits: [1e-12 -] [1e-12 -]
|
||||||
|
Vector: yes yes
|
||||||
|
Vector_Bounds: - -
|
||||||
|
Null_Allowed: yes yes
|
||||||
|
|
||||||
|
|
||||||
|
PARAMETER_TABLE:
|
||||||
|
|
||||||
|
Parameter_Name: input_load input_delay
|
||||||
|
Description: "input load value (F)" "input delay"
|
||||||
|
Data_Type: real real
|
||||||
|
Default_Value: 1.0e-12 0.0
|
||||||
|
Limits: - -
|
||||||
|
Vector: yes yes
|
||||||
|
Vector_Bounds: - -
|
||||||
|
Null_Allowed: yes yes
|
||||||
|
|
||||||
|
PARAMETER_TABLE:
|
||||||
|
|
||||||
|
Parameter_Name: table_values
|
||||||
|
Description: "lookup table values"
|
||||||
|
Data_Type: string
|
||||||
|
Default_Value: "0"
|
||||||
|
Limits: -
|
||||||
|
Vector: no
|
||||||
|
Vector_Bounds: -
|
||||||
|
Null_Allowed: no
|
||||||
|
|
||||||
|
STATIC_VAR_TABLE:
|
||||||
|
|
||||||
|
Static_Var_Name: locdata
|
||||||
|
Description: "lookup table"
|
||||||
|
Data_Type: pointer
|
||||||
|
|
@ -5,6 +5,7 @@ d_buffer
|
||||||
d_dff
|
d_dff
|
||||||
d_dlatch
|
d_dlatch
|
||||||
d_fdiv
|
d_fdiv
|
||||||
|
d_genlut
|
||||||
d_inverter
|
d_inverter
|
||||||
d_jkff
|
d_jkff
|
||||||
d_lut
|
d_lut
|
||||||
|
|
|
||||||
|
|
@ -241,6 +241,8 @@
|
||||||
<ClCompile Include="icm\digital\d_jkff\d_jkff-ifspec.c" />
|
<ClCompile Include="icm\digital\d_jkff\d_jkff-ifspec.c" />
|
||||||
<ClCompile Include="icm\digital\d_lut\d_lut-cfunc.c" />
|
<ClCompile Include="icm\digital\d_lut\d_lut-cfunc.c" />
|
||||||
<ClCompile Include="icm\digital\d_lut\d_lut-ifspec.c" />
|
<ClCompile Include="icm\digital\d_lut\d_lut-ifspec.c" />
|
||||||
|
<ClCompile Include="icm\digital\d_genlut\d_genlut-cfunc.c" />
|
||||||
|
<ClCompile Include="icm\digital\d_genlut\d_genlut-ifspec.c" />
|
||||||
<ClCompile Include="icm\digital\d_nand\d_nand-cfunc.c">
|
<ClCompile Include="icm\digital\d_nand\d_nand-cfunc.c">
|
||||||
<AdditionalIncludeDirectories>..\..\src\xspice\%(RelativeDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
<AdditionalIncludeDirectories>..\..\src\xspice\%(RelativeDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
||||||
</ClCompile>
|
</ClCompile>
|
||||||
|
|
@ -326,6 +328,8 @@
|
||||||
<None Include="..\..\src\xspice\icm\digital\d_dlatch\ifspec.ifs" />
|
<None Include="..\..\src\xspice\icm\digital\d_dlatch\ifspec.ifs" />
|
||||||
<None Include="..\..\src\xspice\icm\digital\d_fdiv\cfunc.mod" />
|
<None Include="..\..\src\xspice\icm\digital\d_fdiv\cfunc.mod" />
|
||||||
<None Include="..\..\src\xspice\icm\digital\d_fdiv\ifspec.ifs" />
|
<None Include="..\..\src\xspice\icm\digital\d_fdiv\ifspec.ifs" />
|
||||||
|
<None Include="..\..\src\xspice\icm\digital\d_genlut\cfunc.mod" />
|
||||||
|
<None Include="..\..\src\xspice\icm\digital\d_genlut\ifspec.ifs" />
|
||||||
<None Include="..\..\src\xspice\icm\digital\d_inverter\cfunc.mod" />
|
<None Include="..\..\src\xspice\icm\digital\d_inverter\cfunc.mod" />
|
||||||
<None Include="..\..\src\xspice\icm\digital\d_inverter\ifspec.ifs" />
|
<None Include="..\..\src\xspice\icm\digital\d_inverter\ifspec.ifs" />
|
||||||
<None Include="..\..\src\xspice\icm\digital\d_jkff\cfunc.mod" />
|
<None Include="..\..\src\xspice\icm\digital\d_jkff\cfunc.mod" />
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue