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Latch handshake on success.

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This commit is contained in:
Martin Vejnár 2013-06-09 10:56:02 +02:00
parent ee47046404
commit e407f26ea6
1 changed files with 7 additions and 2 deletions
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9
usb.v
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@ -136,6 +136,8 @@ localparam
reg[6:0] token_timeout; reg[6:0] token_timeout;
wire token_active = token_timeout != 1'b0; wire token_active = token_timeout != 1'b0;
reg[1:0] handshake_latch;
always @(posedge clk_48 or negedge rst_n) begin always @(posedge clk_48 or negedge rst_n) begin
if (!rst_n) begin if (!rst_n) begin
success <= 1'b0; success <= 1'b0;
@ -149,6 +151,7 @@ always @(posedge clk_48 or negedge rst_n) begin
tx_transmit <= 1'b0; tx_transmit <= 1'b0;
tx_enable_crc16 <= 1'b0; tx_enable_crc16 <= 1'b0;
handshake_latch <= 2'bxx;
end else begin end else begin
if (token_timeout != 1'b0) if (token_timeout != 1'b0)
token_timeout <= token_timeout - 1'b1; token_timeout <= token_timeout - 1'b1;
@ -157,6 +160,7 @@ always @(posedge clk_48 or negedge rst_n) begin
endpoint <= 1'sbx; endpoint <= 1'sbx;
direction_in <= 1'bx; direction_in <= 1'bx;
setup <= 1'bx; setup <= 1'bx;
handshake_latch <= 2'bxx;
end end
success <= 1'b0; success <= 1'b0;
@ -211,9 +215,9 @@ always @(posedge clk_48 or negedge rst_n) begin
end end
pt_data: begin pt_data: begin
if (recv_queue_1_valid && recv_crc16_ok) begin if (recv_queue_1_valid && recv_crc16_ok) begin
transaction_active <= 1'b0;
if (handshake == hs_ack || handshake == hs_none) if (handshake == hs_ack || handshake == hs_none)
success <= 1'b1; success <= 1'b1;
handshake_latch <= handshake;
state <= st_send_handshake; state <= st_send_handshake;
end end
end end
@ -244,6 +248,7 @@ always @(posedge clk_48 or negedge rst_n) begin
if (!tx_transmit && recv_short_idle) begin if (!tx_transmit && recv_short_idle) begin
if (handshake != hs_ack && handshake != hs_none) begin if (handshake != hs_ack && handshake != hs_none) begin
handshake_latch <= handshake;
state <= st_send_handshake; state <= st_send_handshake;
end else begin end else begin
tx_data <= { !data_toggle, 3'b100, data_toggle, 3'b011 }; tx_data <= { !data_toggle, 3'b100, data_toggle, 3'b011 };
@ -303,7 +308,7 @@ always @(posedge clk_48 or negedge rst_n) begin
tx_transmit <= tx_transmit; tx_transmit <= tx_transmit;
if (!tx_transmit && recv_short_idle) begin if (!tx_transmit && recv_short_idle) begin
case (handshake) case (handshake_latch)
hs_none: begin hs_none: begin
state <= st_idle; state <= st_idle;
end end