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UberDDR3
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replace ioserdes loopback with logic

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Angelo Jacobo 2024-10-12 09:43:27 +08:00 committed by GitHub
parent 5b94f77746
commit 95820556c2
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1 changed files with 26 additions and 2 deletions
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28
rtl/ddr3_phy.v
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@ -66,7 +66,7 @@ module ddr3_phy #(
input wire i_controller_write_leveling_calib,
output wire[DQ_BITS*LANES*8-1:0] o_controller_iserdes_data,
output wire[LANES*8-1:0] o_controller_iserdes_dqs,
output wire[LANES*8-1:0] o_controller_iserdes_bitslip_reference,
output reg[LANES*8-1:0] o_controller_iserdes_bitslip_reference,
output wire o_controller_idelayctrl_rdy,
// DDR3 I/O Interface
output wire o_ddr3_clk_p,o_ddr3_clk_n,
@ -148,6 +148,14 @@ module ddr3_phy #(
assign o_ddr3_debug_read_dqs_p = 0;
assign o_ddr3_debug_read_dqs_n = 0;
`endif
reg[LANES - 1 : 0] shift_bitslip_index = 0;
integer index;
// initial value of bitslip reference
initial begin
o_controller_iserdes_bitslip_reference = {LANES{8'b0001_1110}};
shift_bitslip_index = 0;
end
//synchronous reset
always @(posedge i_controller_clk) begin
@ -971,6 +979,7 @@ module ddr3_phy #(
);
// End of IDELAYE2_inst instantiation
// End of IOBUF_inst instantiation
// ISERDESE2: Input SERial/DESerializer with bitslip
//7 Series
@ -1039,6 +1048,21 @@ module ddr3_phy #(
// End of ISERDESE2_inst instantiation
`endif
always @(posedge i_controller_clk) begin
if(!i_rst_n || i_controller_reset) begin
o_controller_iserdes_bitslip_reference[(serdes_ratio*2*gen_index + 7) : (serdes_ratio*2*gen_index + 0)] <= 8'b0001_1110;
shift_bitslip_index[gen_index] <= 0;
end
else if(i_controller_bitslip[gen_index]) begin
// if shift_bitslip_index high, shift right by 3, else shift left by 1 (this is reverse of the IOSelect document for ISERDES sincebit is reversed)
o_controller_iserdes_bitslip_reference[(serdes_ratio*2*gen_index + 7) : (serdes_ratio*2*gen_index + 0)] <=
shift_bitslip_index[gen_index]? {o_controller_iserdes_bitslip_reference[(serdes_ratio*2*gen_index + 2) : (serdes_ratio*2*gen_index + 0)], o_controller_iserdes_bitslip_reference[(serdes_ratio*2*gen_index + 7) : (serdes_ratio*2*gen_index + 3)]}
: {o_controller_iserdes_bitslip_reference[(serdes_ratio*2*gen_index + 6) : (serdes_ratio*2*gen_index + 0)], o_controller_iserdes_bitslip_reference[(serdes_ratio*2*gen_index + 7)]};
shift_bitslip_index[gen_index] <= !shift_bitslip_index[gen_index];
end
end
/*
//ISERDES train
// End of IOBUF_inst instantiation
// ISERDESE2: Input SERial/DESerializer with bitslip
@ -1153,7 +1177,7 @@ module ddr3_phy #(
// 1-bit input: 3-state clock enable
);
// End of OSERDESE2_inst instantiation
*/
end
endgenerate