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xfer-logic: stretch toggles to allow capture

main
Rejeesh Kutty 2015-02-06 22:07:00 -05:00
parent e9231c8f36
commit 9e2e2ef44e
1 changed files with 17 additions and 2 deletions
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19
library/common/up_xfer_status.v
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@ -72,6 +72,9 @@ module up_xfer_status (
// internal registers
reg d_xfer_state_m1 = 'd0;
reg d_xfer_state_m2 = 'd0;
reg d_xfer_state = 'd0;
reg [ 5:0] d_xfer_count = 'd0;
reg d_xfer_toggle = 'd0;
reg [DW:0] d_xfer_data = 'd0;
@ -79,27 +82,37 @@ module up_xfer_status (
reg up_xfer_toggle_m1 = 'd0;
reg up_xfer_toggle_m2 = 'd0;
reg up_xfer_toggle_m3 = 'd0;
reg up_xfer_toggle = 'd0;
reg [DW:0] up_data_status = 'd0;
// internal signals
wire d_xfer_enable_s;
wire up_xfer_toggle_s;
// device status transfer
assign d_xfer_enable_s = d_xfer_state ^ d_xfer_toggle;
always @(posedge d_clk) begin
if (d_rst == 1'b1) begin
d_xfer_state_m1 <= 'd0;
d_xfer_state_m2 <= 'd0;
d_xfer_state <= 'd0;
d_xfer_count <= 'd0;
d_xfer_toggle <= 'd0;
d_xfer_data <= 'd0;
d_acc_data <= 'd0;
end else begin
d_xfer_state_m1 <= up_xfer_toggle;
d_xfer_state_m2 <= d_xfer_state_m1;
d_xfer_state <= d_xfer_state_m2;
d_xfer_count <= d_xfer_count + 1'd1;
if (d_xfer_count == 6'd1) begin
if ((d_xfer_count == 6'd1) && (d_xfer_enable_s == 1'b0)) begin
d_xfer_toggle <= ~d_xfer_toggle;
d_xfer_data <= d_acc_data;
end
if (d_xfer_count == 6'd1) begin
if ((d_xfer_count == 6'd1) && (d_xfer_enable_s == 1'b0)) begin
d_acc_data <= d_data_status;
end else begin
d_acc_data <= d_acc_data | d_data_status;
@ -114,11 +127,13 @@ module up_xfer_status (
up_xfer_toggle_m1 <= 'd0;
up_xfer_toggle_m2 <= 'd0;
up_xfer_toggle_m3 <= 'd0;
up_xfer_toggle <= 'd0;
up_data_status <= 'd0;
end else begin
up_xfer_toggle_m1 <= d_xfer_toggle;
up_xfer_toggle_m2 <= up_xfer_toggle_m1;
up_xfer_toggle_m3 <= up_xfer_toggle_m2;
up_xfer_toggle <= up_xfer_toggle_m3;
if (up_xfer_toggle_s == 1'b1) begin
up_data_status <= d_xfer_data;
end