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From: bknpk@h...<bknpk@h...>
Date: Mon Feb 21 09:38:35 CET 2005
Subject: [usb] processRxBit.v fix to previous fix
I still with my fix so a problem. Here is a new fix. Please send comments.
A good test is tring to send from host to slave a DATA0 packet of 0x1e,
0x1f, 0xff, 0xff.

I would like to suggest now :

`DATA_RX_CHK_SE0:
begin
next_bitStuffError <= 1'b0;
if (RxBits == `SE0)
begin
NextState_prRxBit <= `DATA_RX_WAIT_PRB_RDY;
end //RxBits == `SE0
else
begin
NextState_prRxBit <= `DATA_RX_DATA_DESTUFF;
if (RxBits == oldRXBits) //NRZI no change 1 /change 0
//if the current 'RxBits' are the same as the old 'RxBits', then
begin
next_RXSameBitCount <= RXSameBitCount + 1'b1;
//inc 'RXSameBitCount'
if (RXSameBitCount == `MAX_CONSEC_SAME_BITS)
//if 'RXSameBitCount' == 7 there has been a bit stuff error
next_bitStuffError <= 1'b1;
//flag 'bitStuffError'
else //else no bit stuffing error
begin
next_RXBitCount <= RXBitCount + 1'b1;
if (RXBitCount != 4'h7) begin
next_processRxBitRdy <= 1'b1;
//early indication of ready
end
next_RXByte <= { 1'b1, RXByte[7:1]};
//RZ bit <= 1 (ie no change in 'RxBits')
end
end
else //else current 'RxBits' are
different from old 'RxBits'
begin
if (RXSameBitCount != `MAX_CONSEC_SAME_BITS)
//if this is not the RZ 0 bit after 6 consecutive RZ 1s, then
begin
next_RXBitCount <= RXBitCount + 1'b1;
if (RXBitCount != 4'h7) begin
next_processRxBitRdy <= 1'b1;
//early indication of ready
end
next_RXByte <= {1'b0, RXByte[7:1]};
//RZ bit <= 0 (ie current'RxBits' is different than old 'RxBits')
end
//by PK
//old
//next_RXSameBitCount <= 4'h1;
//old
//new
if (RXSameBitCount == `MAX_CONSEC_SAME_BITS)
next_RXSameBitCount <= 4'h1;
else
next_RXSameBitCount <= 4'h0;
//reset 'RXSameBitCount'
//new
//by PK
end
next_oldRXBits <= RxBits;
end
end