According to the text(and second code snippet), you have to check for
enq_ack and
not full, as is written in the code. Follows diff.
--- ogp/docs/fifos.tex 2007-04-26 07:59:22.000000000 -0300
+++ my-ogp/docs/fifos.tex 2007-04-26 08:25:09.000000000 -0300
@@ -65,7 +65,7 @@
reg enq;
reg [16:0] din;
always @(posedge clock) begin
- if (!full) begin
+ if (enq_ack) begin
enq <= 0;
end
if (want_to_write) begin
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