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clarify bufif output strenghts.

This commit is contained in:
steve 2001-12-19 23:43:03 +00:00
parent dddbeb957a
commit 7c9fe0c173
1 changed files with 17 additions and 8 deletions
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25
vvp/bufif.cc
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@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: bufif.cc,v 1.5 2001/12/14 06:03:17 steve Exp $"
#ident "$Id: bufif.cc,v 1.6 2001/12/19 23:43:03 steve Exp $"
#endif
# include "bufif.h"
@ -33,9 +33,9 @@ void vvp_bufif_s::set(vvp_ipoint_t ptr, bool push, unsigned v, unsigned)
unsigned char out0 = 0x00 | (odrive0<<0) | (odrive0<<4);
unsigned char out1 = 0x88 | (odrive1<<0) | (odrive1<<4);
unsigned char outX = 0x80 | (odrive1<<0) | (odrive0<<4);
unsigned char outX = 0x80 | (odrive0<<0) | (odrive1<<4);
unsigned char outH = 0x88 | (0) | (odrive1<<4);
unsigned char outL = 0x00 | (odrive1<<0) | (0);
unsigned char outL = 0x00 | (odrive0<<0) | (0);
unsigned val;
unsigned str;
@ -43,13 +43,13 @@ void vvp_bufif_s::set(vvp_ipoint_t ptr, bool push, unsigned v, unsigned)
switch (in1 ^ pol_) {
case 1:
switch (in0) {
switch (in0 ^ inv_) {
case 0:
val = 0 ^ inv_;
val = 0;
str = out0;
break;
case 1:
val = 1 ^ inv_;
val = 1;
str = out1;
break;
default:
@ -64,16 +64,22 @@ void vvp_bufif_s::set(vvp_ipoint_t ptr, bool push, unsigned v, unsigned)
str = HiZ;
break;
/* The control input is x or z, so the output is H or
L, depending on the (possibly inverted) input. This
is not the same as X, as it is a combination of the
drive strength of the output and HiZ. */
default:
val = 2;
switch (in0) {
switch (in0 ^ inv_) {
case 0:
val = 2;
str = outL;
break;
case 1:
val = 2;
str = outH;
break;
default:
val = 2;
str = outX;
break;
}
@ -85,6 +91,9 @@ void vvp_bufif_s::set(vvp_ipoint_t ptr, bool push, unsigned v, unsigned)
/*
* $Log: bufif.cc,v $
* Revision 1.6 2001/12/19 23:43:03 steve
* clarify bufif output strenghts.
*
* Revision 1.5 2001/12/14 06:03:17 steve
* Arrange bufif to support notif as well.
*