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xfer-logic: stretch toggles to allow capture

main
Rejeesh Kutty 2015-02-06 22:06:56 -05:00
parent e111e1336e
commit e9231c8f36
1 changed files with 17 additions and 2 deletions
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19
library/common/up_xfer_cntrl.v
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@ -74,6 +74,9 @@ module up_xfer_cntrl (
// internal registers
reg up_xfer_state_m1 = 'd0;
reg up_xfer_state_m2 = 'd0;
reg up_xfer_state = 'd0;
reg [ 5:0] up_xfer_count = 'd0;
reg up_xfer_done = 'd0;
reg up_xfer_toggle = 'd0;
@ -81,24 +84,34 @@ module up_xfer_cntrl (
reg d_xfer_toggle_m1 = 'd0;
reg d_xfer_toggle_m2 = 'd0;
reg d_xfer_toggle_m3 = 'd0;
reg d_xfer_toggle = 'd0;
reg [DW:0] d_data_cntrl = 'd0;
// internal signals
wire up_xfer_enable_s;
wire d_xfer_toggle_s;
// device control transfer
assign up_xfer_enable_s = up_xfer_state ^ up_xfer_toggle;
always @(negedge up_rstn or posedge up_clk) begin
if (up_rstn == 1'b0) begin
up_xfer_state_m1 <= 'd0;
up_xfer_state_m2 <= 'd0;
up_xfer_state <= 'd0;
up_xfer_count <= 'd0;
up_xfer_done <= 'd0;
up_xfer_toggle <= 'd0;
up_xfer_data <= 'd0;
end else begin
up_xfer_state_m1 <= d_xfer_toggle;
up_xfer_state_m2 <= up_xfer_state_m1;
up_xfer_state <= up_xfer_state_m2;
up_xfer_count <= up_xfer_count + 1'd1;
up_xfer_done <= (up_xfer_count == 6'd1) ? 1'b1 : 1'b0;
if (up_xfer_count == 6'd1) begin
up_xfer_done <= (up_xfer_count == 6'd1) ? ~up_xfer_enable_s : 1'b0;
if ((up_xfer_count == 6'd1) && (up_xfer_enable_s == 1'b0)) begin
up_xfer_toggle <= ~up_xfer_toggle;
up_xfer_data <= up_data_cntrl;
end
@ -112,11 +125,13 @@ module up_xfer_cntrl (
d_xfer_toggle_m1 <= 'd0;
d_xfer_toggle_m2 <= 'd0;
d_xfer_toggle_m3 <= 'd0;
d_xfer_toggle <= 'd0;
d_data_cntrl <= 'd0;
end else begin
d_xfer_toggle_m1 <= up_xfer_toggle;
d_xfer_toggle_m2 <= d_xfer_toggle_m1;
d_xfer_toggle_m3 <= d_xfer_toggle_m2;
d_xfer_toggle <= d_xfer_toggle_m3;
if (d_xfer_toggle_s == 1'b1) begin
d_data_cntrl <= up_xfer_data;
end