common: Make sure RAM inference works with yosys

icecube doesn't care about init values, but yosys does and you can't
satisfy them with HW RAM module.

So here we remove all the init values and we make sure the reads are
not dependent on the reset line

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

Author: smunaut

common/usb_fs_in_pe.v

@@ -51,7 +51,7 @@ module usb_fs_in_pe #(
   // Data payload to send if any
   output tx_data_avail,
   input tx_data_get,
-  output reg [7:0] tx_data = 0
+  output reg [7:0] tx_data
 );
 
   ////////////////////////////////////////////////////////////////////////////////
@@ -344,6 +344,9 @@ module usb_fs_in_pe #(
     endcase
   end
 
+  always @(posedge clk)
+      tx_data <= in_data_buffer[buffer_get_addr];
+
   integer j;
   always @(posedge clk) begin
     if (reset) begin
@@ -352,8 +355,6 @@ module usb_fs_in_pe #(
     end else begin
       in_xfr_state <= in_xfr_state_next;
 
-      tx_data <= in_data_buffer[buffer_get_addr];
-
       if (setup_token_received) begin
         data_toggle[rx_endp] <= 1;
       end

common/usb_fs_out_pe.v

@@ -14,7 +14,7 @@ module usb_fs_out_pe #(
   output [NUM_OUT_EPS-1:0] out_ep_data_avail,
   output reg [NUM_OUT_EPS-1:0] out_ep_setup = 0,
   input [NUM_OUT_EPS-1:0] out_ep_data_get,
-  output reg [7:0] out_ep_data = 0,
+  output reg [7:0] out_ep_data,
   input [NUM_OUT_EPS-1:0] out_ep_stall,
   output reg [NUM_OUT_EPS-1:0] out_ep_acked = 0,