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xfcp: Rename signals based on upstream/downstsream port role and data direction to simplify connections

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
This commit is contained in:
Alex Forencich
2025-03-11 18:33:57 -07:00
parent 8d4ad59727
commit 7df14e54e5
12 changed files with 432 additions and 432 deletions
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324
rtl/xfcp/taxi_xfcp_mod_axil.sv
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@@ -30,8 +30,8 @@ module taxi_xfcp_mod_axil #
/*
* XFCP upstream port
*/
taxi_axis_if.snk up_xfcp_in,
taxi_axis_if.src up_xfcp_out,
taxi_axis_if.snk xfcp_usp_ds,
taxi_axis_if.src xfcp_usp_us,
/*
* AXI lite master interface
@@ -166,7 +166,7 @@ logic write_reg = 1'b0, write_next;
logic [ADDR_W_ADJ-1:0] addr_reg = '0, addr_next;
logic [DATA_W-1:0] data_reg = '0, data_next;
logic up_xfcp_in_tready_reg = 1'b0, up_xfcp_in_tready_next;
logic xfcp_usp_ds_tready_reg = 1'b0, xfcp_usp_ds_tready_next;
logic m_axil_awvalid_reg = 1'b0, m_axil_awvalid_next;
logic [STRB_W-1:0] m_axil_wstrb_reg = '0, m_axil_wstrb_next;
@@ -176,14 +176,14 @@ logic m_axil_arvalid_reg = 1'b0, m_axil_arvalid_next;
logic m_axil_rready_reg = 1'b0, m_axil_rready_next;
// internal datapath
logic [7:0] up_xfcp_out_tdata_int;
logic up_xfcp_out_tvalid_int;
logic up_xfcp_out_tready_int_reg = 1'b0;
logic up_xfcp_out_tlast_int;
logic up_xfcp_out_tuser_int;
wire up_xfcp_out_tready_int_early;
logic [7:0] xfcp_usp_us_tdata_int;
logic xfcp_usp_us_tvalid_int;
logic xfcp_usp_us_tready_int_reg = 1'b0;
logic xfcp_usp_us_tlast_int;
logic xfcp_usp_us_tuser_int;
wire xfcp_usp_us_tready_int_early;
assign up_xfcp_in.tready = up_xfcp_in_tready_reg;
assign xfcp_usp_ds.tready = xfcp_usp_ds_tready_reg;
assign m_axil_wr.awaddr = addr_reg;
assign m_axil_wr.awprot = 3'b010;
@@ -210,12 +210,12 @@ always_comb begin
id_ptr_next = id_ptr_reg;
up_xfcp_in_tready_next = 1'b0;
xfcp_usp_ds_tready_next = 1'b0;
up_xfcp_out_tdata_int = '0;
up_xfcp_out_tvalid_int = 1'b0;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = '0;
xfcp_usp_us_tvalid_int = 1'b0;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
addr_next = addr_reg;
data_next = data_reg;
@@ -230,26 +230,26 @@ always_comb begin
case (state_reg)
STATE_IDLE: begin
// idle, wait for start of packet
up_xfcp_in_tready_next = up_xfcp_out_tready_int_early;
xfcp_usp_ds_tready_next = xfcp_usp_us_tready_int_early;
id_ptr_next = '0;
if (up_xfcp_in.tready && up_xfcp_in.tvalid) begin
if (up_xfcp_in.tlast) begin
if (xfcp_usp_ds.tready && xfcp_usp_ds.tvalid) begin
if (xfcp_usp_ds.tlast) begin
// last asserted, ignore cycle
state_next = STATE_IDLE;
end else if (up_xfcp_in.tdata == RPATH_TAG) begin
end else if (xfcp_usp_ds.tdata == RPATH_TAG) begin
// need to pass through rpath
up_xfcp_out_tdata_int = up_xfcp_in.tdata;
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = xfcp_usp_ds.tdata;
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
state_next = STATE_HEADER_1;
end else if (up_xfcp_in.tdata == START_TAG) begin
end else if (xfcp_usp_ds.tdata == START_TAG) begin
// process header
up_xfcp_out_tdata_int = up_xfcp_in.tdata;
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = xfcp_usp_ds.tdata;
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
state_next = STATE_HEADER_2;
end else begin
// bad start byte, drop packet
@@ -261,20 +261,20 @@ always_comb begin
end
STATE_HEADER_1: begin
// transfer through header
up_xfcp_in_tready_next = up_xfcp_out_tready_int_early;
xfcp_usp_ds_tready_next = xfcp_usp_us_tready_int_early;
if (up_xfcp_in.tready && up_xfcp_in.tvalid) begin
if (xfcp_usp_ds.tready && xfcp_usp_ds.tvalid) begin
// transfer through
up_xfcp_out_tdata_int = up_xfcp_in.tdata;
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = xfcp_usp_ds.tdata;
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
if (up_xfcp_in.tlast) begin
if (xfcp_usp_ds.tlast) begin
// last asserted in header, mark as such and drop
up_xfcp_out_tuser_int = 1'b1;
xfcp_usp_us_tuser_int = 1'b1;
state_next = STATE_IDLE;
end else if (up_xfcp_in.tdata == START_TAG) begin
end else if (xfcp_usp_ds.tdata == START_TAG) begin
// process header
state_next = STATE_HEADER_2;
end else begin
@@ -286,40 +286,40 @@ always_comb begin
end
STATE_HEADER_2: begin
// read packet type
up_xfcp_in_tready_next = up_xfcp_out_tready_int_early;
xfcp_usp_ds_tready_next = xfcp_usp_us_tready_int_early;
if (up_xfcp_in.tready && up_xfcp_in.tvalid) begin
if (up_xfcp_in.tdata == READ_REQ && !up_xfcp_in.tlast) begin
if (xfcp_usp_ds.tready && xfcp_usp_ds.tvalid) begin
if (xfcp_usp_ds.tdata == READ_REQ && !xfcp_usp_ds.tlast) begin
// start of read
up_xfcp_out_tdata_int = READ_RESP;
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = READ_RESP;
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
write_next = 1'b0;
count_next = 8'(COUNT_BYTE_LANES+ADDR_BYTE_LANES-1);
state_next = STATE_HEADER_3;
end else if (up_xfcp_in.tdata == WRITE_REQ && !up_xfcp_in.tlast) begin
end else if (xfcp_usp_ds.tdata == WRITE_REQ && !xfcp_usp_ds.tlast) begin
// start of write
up_xfcp_out_tdata_int = WRITE_RESP;
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = WRITE_RESP;
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
write_next = 1'b1;
count_next = 8'(COUNT_BYTE_LANES+ADDR_BYTE_LANES-1);
state_next = STATE_HEADER_3;
end else if (up_xfcp_in.tdata == ID_REQ) begin
end else if (xfcp_usp_ds.tdata == ID_REQ) begin
// identify
up_xfcp_out_tdata_int = ID_RESP;
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = ID_RESP;
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
state_next = STATE_ID;
end else begin
// invalid start of packet
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b1;
up_xfcp_out_tuser_int = 1'b1;
if (up_xfcp_in.tlast) begin
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b1;
xfcp_usp_us_tuser_int = 1'b1;
if (xfcp_usp_ds.tlast) begin
state_next = STATE_IDLE;
end else begin
state_next = STATE_WAIT_LAST;
@@ -331,19 +331,19 @@ always_comb begin
end
STATE_HEADER_3: begin
// store address and length
up_xfcp_in_tready_next = up_xfcp_out_tready_int_early;
xfcp_usp_ds_tready_next = xfcp_usp_us_tready_int_early;
if (up_xfcp_in.tready && up_xfcp_in.tvalid) begin
if (xfcp_usp_ds.tready && xfcp_usp_ds.tvalid) begin
// pass through
up_xfcp_out_tdata_int = up_xfcp_in.tdata;
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = xfcp_usp_ds.tdata;
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
// store pointers
if (count_reg < COUNT_BYTE_LANES) begin
ptr_next[8*(COUNT_BYTE_LANES-count_reg-1) +: 8] = up_xfcp_in.tdata;
ptr_next[8*(COUNT_BYTE_LANES-count_reg-1) +: 8] = xfcp_usp_ds.tdata;
end else begin
addr_next[8*(ADDR_BYTE_LANES-(count_reg-COUNT_BYTE_LANES)-1) +: 8] = up_xfcp_in.tdata;
addr_next[8*(ADDR_BYTE_LANES-(count_reg-COUNT_BYTE_LANES)-1) +: 8] = xfcp_usp_ds.tdata;
end
count_next = count_reg - 1;
if (count_reg == 0) begin
@@ -354,27 +354,27 @@ always_comb begin
data_next = '0;
if (write_reg) begin
// start writing
if (up_xfcp_in.tlast) begin
if (xfcp_usp_ds.tlast) begin
// end of frame in header
up_xfcp_out_tlast_int = 1'b1;
up_xfcp_out_tuser_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b1;
xfcp_usp_us_tuser_int = 1'b1;
state_next = STATE_IDLE;
end else begin
up_xfcp_out_tlast_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b1;
state_next = STATE_WRITE_1;
end
end else begin
// start reading
up_xfcp_in_tready_next = !(last_cycle_reg || (up_xfcp_in.tvalid && up_xfcp_in.tlast));
xfcp_usp_ds_tready_next = !(last_cycle_reg || (xfcp_usp_ds.tvalid && xfcp_usp_ds.tlast));
m_axil_arvalid_next = 1'b1;
m_axil_rready_next = 1'b1;
state_next = STATE_READ_1;
end
end else begin
if (up_xfcp_in.tlast) begin
if (xfcp_usp_ds.tlast) begin
// end of frame in header
up_xfcp_out_tlast_int = 1'b1;
up_xfcp_out_tuser_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b1;
xfcp_usp_us_tuser_int = 1'b1;
state_next = STATE_IDLE;
end else begin
state_next = STATE_HEADER_3;
@@ -389,7 +389,7 @@ always_comb begin
m_axil_rready_next = 1'b1;
// drop padding
up_xfcp_in_tready_next = !(last_cycle_reg || (up_xfcp_in.tvalid && up_xfcp_in.tlast));
xfcp_usp_ds_tready_next = !(last_cycle_reg || (xfcp_usp_ds.tvalid && xfcp_usp_ds.tlast));
if (m_axil_rd.rready && m_axil_rd.rvalid) begin
// read cycle complete, store result
@@ -405,23 +405,23 @@ always_comb begin
// send data
// drop padding
up_xfcp_in_tready_next = !(last_cycle_reg || (up_xfcp_in.tvalid && up_xfcp_in.tlast));
xfcp_usp_ds_tready_next = !(last_cycle_reg || (xfcp_usp_ds.tvalid && xfcp_usp_ds.tlast));
if (up_xfcp_out_tready_int_reg) begin
if (xfcp_usp_us_tready_int_reg) begin
// transfer word and update pointers
up_xfcp_out_tdata_int = data_reg[8*count_reg +: 8];
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = data_reg[8*count_reg +: 8];
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
count_next = count_reg + 1;
ptr_next = ptr_reg - 1;
if (ptr_reg == 1) begin
// last word of read
up_xfcp_out_tlast_int = 1'b1;
if (!(last_cycle_reg || (up_xfcp_in.tvalid && up_xfcp_in.tlast))) begin
xfcp_usp_us_tlast_int = 1'b1;
if (!(last_cycle_reg || (xfcp_usp_ds.tvalid && xfcp_usp_ds.tlast))) begin
state_next = STATE_WAIT_LAST;
end else begin
up_xfcp_in_tready_next = up_xfcp_out_tready_int_early;
xfcp_usp_ds_tready_next = xfcp_usp_us_tready_int_early;
state_next = STATE_IDLE;
end
end else if (count_reg == (STRB_W*BYTE_W/8)-1) begin
@@ -439,27 +439,27 @@ always_comb begin
end
STATE_WRITE_1: begin
// write data
up_xfcp_in_tready_next = 1'b1;
xfcp_usp_ds_tready_next = 1'b1;
if (up_xfcp_in.tready && up_xfcp_in.tvalid) begin
if (xfcp_usp_ds.tready && xfcp_usp_ds.tvalid) begin
// store word
data_next[8*count_reg +: 8] = up_xfcp_in.tdata;
data_next[8*count_reg +: 8] = xfcp_usp_ds.tdata;
count_next = count_reg + 1;
ptr_next = ptr_reg - 1;
m_axil_wstrb_next[count_reg >> ((BYTE_W/8)-1)] = 1'b1;
if (count_reg == (STRB_W*BYTE_W/8)-1 || ptr_reg == 1) begin
// have full word or at end of block, start write operation
count_next = 0;
up_xfcp_in_tready_next = 1'b0;
xfcp_usp_ds_tready_next = 1'b0;
m_axil_awvalid_next = 1'b1;
m_axil_wvalid_next = 1'b1;
m_axil_bready_next = 1'b1;
state_next = STATE_WRITE_2;
if (up_xfcp_in.tlast) begin
if (xfcp_usp_ds.tlast) begin
// last asserted, nothing further to write
ptr_next = 0;
end
end else if (up_xfcp_in.tlast) begin
end else if (xfcp_usp_ds.tlast) begin
// last asserted, return to idle
state_next = STATE_IDLE;
end else begin
@@ -482,10 +482,10 @@ always_comb begin
if (ptr_reg == 0) begin
// done writing
if (!last_cycle_reg) begin
up_xfcp_in_tready_next = 1'b1;
xfcp_usp_ds_tready_next = 1'b1;
state_next = STATE_WAIT_LAST;
end else begin
up_xfcp_in_tready_next = up_xfcp_out_tready_int_early;
xfcp_usp_ds_tready_next = xfcp_usp_us_tready_int_early;
state_next = STATE_IDLE;
end
end else begin
@@ -500,23 +500,23 @@ always_comb begin
// send ID
// drop padding
up_xfcp_in_tready_next = !(last_cycle_reg || (up_xfcp_in.tvalid && up_xfcp_in.tlast));
xfcp_usp_ds_tready_next = !(last_cycle_reg || (xfcp_usp_ds.tvalid && xfcp_usp_ds.tlast));
up_xfcp_out_tdata_int = id_rom[id_ptr_reg];
up_xfcp_out_tvalid_int = 1'b1;
up_xfcp_out_tlast_int = 1'b0;
up_xfcp_out_tuser_int = 1'b0;
xfcp_usp_us_tdata_int = id_rom[id_ptr_reg];
xfcp_usp_us_tvalid_int = 1'b1;
xfcp_usp_us_tlast_int = 1'b0;
xfcp_usp_us_tuser_int = 1'b0;
if (up_xfcp_out_tready_int_reg) begin
if (xfcp_usp_us_tready_int_reg) begin
// increment pointer
id_ptr_next = id_ptr_reg + 1;
if (id_ptr_reg == ID_PTR_W'(ID_ROM_SIZE-1)) begin
// read out whole ID
up_xfcp_out_tlast_int = 1'b1;
if (!(last_cycle_reg || (up_xfcp_in.tvalid && up_xfcp_in.tlast))) begin
xfcp_usp_us_tlast_int = 1'b1;
if (!(last_cycle_reg || (xfcp_usp_ds.tvalid && xfcp_usp_ds.tlast))) begin
state_next = STATE_WAIT_LAST;
end else begin
up_xfcp_in_tready_next = up_xfcp_out_tready_int_early;
xfcp_usp_ds_tready_next = xfcp_usp_us_tready_int_early;
state_next = STATE_IDLE;
end
end else begin
@@ -528,12 +528,12 @@ always_comb begin
end
STATE_WAIT_LAST: begin
// wait for end of frame
up_xfcp_in_tready_next = 1'b1;
xfcp_usp_ds_tready_next = 1'b1;
if (up_xfcp_in.tready && up_xfcp_in.tvalid) begin
if (xfcp_usp_ds.tready && xfcp_usp_ds.tvalid) begin
// wait for tlast
if (up_xfcp_in.tlast) begin
up_xfcp_in_tready_next = up_xfcp_out_tready_int_early;
if (xfcp_usp_ds.tlast) begin
xfcp_usp_ds_tready_next = xfcp_usp_us_tready_int_early;
state_next = STATE_IDLE;
end else begin
state_next = STATE_WAIT_LAST;
@@ -558,14 +558,14 @@ always_ff @(posedge clk) begin
count_reg <= count_next;
write_reg <= write_next;
if (up_xfcp_in.tready && up_xfcp_in.tvalid) begin
last_cycle_reg <= up_xfcp_in.tlast;
if (xfcp_usp_ds.tready && xfcp_usp_ds.tvalid) begin
last_cycle_reg <= xfcp_usp_ds.tlast;
end
addr_reg <= addr_next;
data_reg <= data_next;
up_xfcp_in_tready_reg <= up_xfcp_in_tready_next;
xfcp_usp_ds_tready_reg <= xfcp_usp_ds_tready_next;
m_axil_awvalid_reg <= m_axil_awvalid_next;
m_axil_wstrb_reg <= m_axil_wstrb_next;
@@ -576,7 +576,7 @@ always_ff @(posedge clk) begin
if (rst) begin
state_reg <= STATE_IDLE;
up_xfcp_in_tready_reg <= 1'b0;
xfcp_usp_ds_tready_reg <= 1'b0;
m_axil_awvalid_reg <= 1'b0;
m_axil_wvalid_reg <= 1'b0;
m_axil_bready_reg <= 1'b0;
@@ -586,87 +586,87 @@ always_ff @(posedge clk) begin
end
// output datapath logic
logic [7:0] up_xfcp_out_tdata_reg = '0;
logic up_xfcp_out_tvalid_reg = 1'b0, up_xfcp_out_tvalid_next;
logic up_xfcp_out_tlast_reg = 1'b0;
logic up_xfcp_out_tuser_reg = 1'b0;
logic [7:0] xfcp_usp_us_tdata_reg = '0;
logic xfcp_usp_us_tvalid_reg = 1'b0, xfcp_usp_us_tvalid_next;
logic xfcp_usp_us_tlast_reg = 1'b0;
logic xfcp_usp_us_tuser_reg = 1'b0;
logic [7:0] temp_up_xfcp_tdata_reg = '0;
logic temp_up_xfcp_tvalid_reg = 1'b0, temp_up_xfcp_tvalid_next;
logic temp_up_xfcp_tlast_reg = 1'b0;
logic temp_up_xfcp_tuser_reg = 1'b0;
logic [7:0] temp_xfcp_usp_us_tdata_reg = '0;
logic temp_xfcp_usp_us_tvalid_reg = 1'b0, temp_xfcp_usp_us_tvalid_next;
logic temp_xfcp_usp_us_tlast_reg = 1'b0;
logic temp_xfcp_usp_us_tuser_reg = 1'b0;
// datapath control
reg store_up_xfcp_int_to_output;
reg store_up_xfcp_int_to_temp;
reg store_up_xfcp_temp_to_output;
reg store_xfcp_usp_us_int_to_output;
reg store_xfcp_usp_us_int_to_temp;
reg store_xfcp_usp_us_temp_to_output;
assign up_xfcp_out.tdata = up_xfcp_out_tdata_reg;
assign up_xfcp_out.tkeep = '1;
assign up_xfcp_out.tstrb = up_xfcp_out.tkeep;
assign up_xfcp_out.tvalid = up_xfcp_out_tvalid_reg;
assign up_xfcp_out.tlast = up_xfcp_out_tlast_reg;
assign up_xfcp_out.tid = '0;
assign up_xfcp_out.tdest = '0;
assign up_xfcp_out.tuser = up_xfcp_out_tuser_reg;
assign xfcp_usp_us.tdata = xfcp_usp_us_tdata_reg;
assign xfcp_usp_us.tkeep = '1;
assign xfcp_usp_us.tstrb = xfcp_usp_us.tkeep;
assign xfcp_usp_us.tvalid = xfcp_usp_us_tvalid_reg;
assign xfcp_usp_us.tlast = xfcp_usp_us_tlast_reg;
assign xfcp_usp_us.tid = '0;
assign xfcp_usp_us.tdest = '0;
assign xfcp_usp_us.tuser = xfcp_usp_us_tuser_reg;
// enable ready input next cycle if output is ready or the temp reg will not be filled on the next cycle (output reg empty or no input)
assign up_xfcp_out_tready_int_early = up_xfcp_out.tready || (!temp_up_xfcp_tvalid_reg && (!up_xfcp_out_tvalid_reg || !up_xfcp_out_tvalid_int));
assign xfcp_usp_us_tready_int_early = xfcp_usp_us.tready || (!temp_xfcp_usp_us_tvalid_reg && (!xfcp_usp_us_tvalid_reg || !xfcp_usp_us_tvalid_int));
always_comb begin
// transfer sink ready state to source
up_xfcp_out_tvalid_next = up_xfcp_out_tvalid_reg;
temp_up_xfcp_tvalid_next = temp_up_xfcp_tvalid_reg;
xfcp_usp_us_tvalid_next = xfcp_usp_us_tvalid_reg;
temp_xfcp_usp_us_tvalid_next = temp_xfcp_usp_us_tvalid_reg;
store_up_xfcp_int_to_output = 1'b0;
store_up_xfcp_int_to_temp = 1'b0;
store_up_xfcp_temp_to_output = 1'b0;
store_xfcp_usp_us_int_to_output = 1'b0;
store_xfcp_usp_us_int_to_temp = 1'b0;
store_xfcp_usp_us_temp_to_output = 1'b0;
if (up_xfcp_out_tready_int_reg) begin
if (xfcp_usp_us_tready_int_reg) begin
// input is ready
if (up_xfcp_out.tready || !up_xfcp_out_tvalid_reg) begin
if (xfcp_usp_us.tready || !xfcp_usp_us_tvalid_reg) begin
// output is ready or currently not valid, transfer data to output
up_xfcp_out_tvalid_next = up_xfcp_out_tvalid_int;
store_up_xfcp_int_to_output = 1'b1;
xfcp_usp_us_tvalid_next = xfcp_usp_us_tvalid_int;
store_xfcp_usp_us_int_to_output = 1'b1;
end else begin
// output is not ready, store input in temp
temp_up_xfcp_tvalid_next = up_xfcp_out_tvalid_int;
store_up_xfcp_int_to_temp = 1'b1;
temp_xfcp_usp_us_tvalid_next = xfcp_usp_us_tvalid_int;
store_xfcp_usp_us_int_to_temp = 1'b1;
end
end else if (up_xfcp_out.tready) begin
end else if (xfcp_usp_us.tready) begin
// input is not ready, but output is ready
up_xfcp_out_tvalid_next = temp_up_xfcp_tvalid_reg;
temp_up_xfcp_tvalid_next = 1'b0;
store_up_xfcp_temp_to_output = 1'b1;
xfcp_usp_us_tvalid_next = temp_xfcp_usp_us_tvalid_reg;
temp_xfcp_usp_us_tvalid_next = 1'b0;
store_xfcp_usp_us_temp_to_output = 1'b1;
end
end
always_ff @(posedge clk) begin
up_xfcp_out_tvalid_reg <= up_xfcp_out_tvalid_next;
up_xfcp_out_tready_int_reg <= up_xfcp_out_tready_int_early;
temp_up_xfcp_tvalid_reg <= temp_up_xfcp_tvalid_next;
xfcp_usp_us_tvalid_reg <= xfcp_usp_us_tvalid_next;
xfcp_usp_us_tready_int_reg <= xfcp_usp_us_tready_int_early;
temp_xfcp_usp_us_tvalid_reg <= temp_xfcp_usp_us_tvalid_next;
// datapath
if (store_up_xfcp_int_to_output) begin
up_xfcp_out_tdata_reg <= up_xfcp_out_tdata_int;
up_xfcp_out_tlast_reg <= up_xfcp_out_tlast_int;
up_xfcp_out_tuser_reg <= up_xfcp_out_tuser_int;
end else if (store_up_xfcp_temp_to_output) begin
up_xfcp_out_tdata_reg <= temp_up_xfcp_tdata_reg;
up_xfcp_out_tlast_reg <= temp_up_xfcp_tlast_reg;
up_xfcp_out_tuser_reg <= temp_up_xfcp_tuser_reg;
if (store_xfcp_usp_us_int_to_output) begin
xfcp_usp_us_tdata_reg <= xfcp_usp_us_tdata_int;
xfcp_usp_us_tlast_reg <= xfcp_usp_us_tlast_int;
xfcp_usp_us_tuser_reg <= xfcp_usp_us_tuser_int;
end else if (store_xfcp_usp_us_temp_to_output) begin
xfcp_usp_us_tdata_reg <= temp_xfcp_usp_us_tdata_reg;
xfcp_usp_us_tlast_reg <= temp_xfcp_usp_us_tlast_reg;
xfcp_usp_us_tuser_reg <= temp_xfcp_usp_us_tuser_reg;
end
if (store_up_xfcp_int_to_temp) begin
temp_up_xfcp_tdata_reg <= up_xfcp_out_tdata_int;
temp_up_xfcp_tlast_reg <= up_xfcp_out_tlast_int;
temp_up_xfcp_tuser_reg <= up_xfcp_out_tuser_int;
if (store_xfcp_usp_us_int_to_temp) begin
temp_xfcp_usp_us_tdata_reg <= xfcp_usp_us_tdata_int;
temp_xfcp_usp_us_tlast_reg <= xfcp_usp_us_tlast_int;
temp_xfcp_usp_us_tuser_reg <= xfcp_usp_us_tuser_int;
end
if (rst) begin
up_xfcp_out_tvalid_reg <= 1'b0;
up_xfcp_out_tready_int_reg <= 1'b0;
temp_up_xfcp_tvalid_reg <= 1'b0;
xfcp_usp_us_tvalid_reg <= 1'b0;
xfcp_usp_us_tready_int_reg <= 1'b0;
temp_xfcp_usp_us_tvalid_reg <= 1'b0;
end
end