Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

FIFO holding one item in it

Gentlemen; I have used the Megafunction wizard to create a 8x64 FIFO buffer on my DE0-NANO board. It is to buffer signals received on GPIO0[0] at 9600 baud and retransmit them on GPIO1[0]. I have...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

In the default configuration for FIFO's you have to do a read request on the read side and one clock cycle later the first data is presented on the output. This is why you read 0x00 on your first read.

You can configure the FIFO in "read ahead" mode to avoid this or adapt your logic according to the one clock cycle delayed read.