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Changed SDC outputs to ensure they are aligned to the falling edge of the divided down clock rather than the processor clock.

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This commit is contained in:
Ross Thompson 2023-10-10 17:46:12 -05:00
parent 5e65138552
commit d33c966a42
1 changed files with 2 additions and 2 deletions
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4
fpga/src/axi_sdc_controller.v
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@ -205,7 +205,7 @@ always @(posedge clock)
reset_sync <= {reset_sync[1:0], !async_resetn}; reset_sync <= {reset_sync[1:0], !async_resetn};
reg [7:0] clock_cnt; reg [7:0] clock_cnt;
reg clock_state; (* mark_debug = "true" *) reg clock_state;
(* mark_debug = "true" *) reg clock_posedge; (* mark_debug = "true" *) reg clock_posedge;
reg clock_data_in; reg clock_data_in;
wire fifo_almost_full; wire fifo_almost_full;
@ -265,7 +265,7 @@ wire sd_dat_oe;
// IOBUF IOBUF_dat2 (.O(sd_dat_i[2]), .IO(sdio_dat[2]), .I(sd_dat_reg_o[2]), .T(sd_dat_reg_t)); // IOBUF IOBUF_dat2 (.O(sd_dat_i[2]), .IO(sdio_dat[2]), .I(sd_dat_reg_o[2]), .T(sd_dat_reg_t));
// IOBUF IOBUF_dat3 (.O(sd_dat_i[3]), .IO(sdio_dat[3]), .I(sd_dat_reg_o[3]), .T(sd_dat_reg_t)); // IOBUF IOBUF_dat3 (.O(sd_dat_i[3]), .IO(sdio_dat[3]), .I(sd_dat_reg_o[3]), .T(sd_dat_reg_t));
always @(negedge clock) begin always @(negedge sdio_clk) begin
// Output data delayed by 1/2 clock cycle (5ns) to ensure // Output data delayed by 1/2 clock cycle (5ns) to ensure
// required hold time: default speed - min 5ns, high speed - min 2ns (actual 5ns) // required hold time: default speed - min 5ns, high speed - min 2ns (actual 5ns)
if (sdio_reset) begin if (sdio_reset) begin