First-in, First-out (FIFO) Memory Buffer with Built-in Self Test (BIST)

Specifications

Write speed: 400 MHz
Read speed: 40 MHz
Depth: 10 words
Flags:
- Empty: set when the synchronized write pointer is equal to read pointer
- Full: set when write pointer's MSB is not equal to synchronized read pointer's MSB, while the rest of the bits must be equal.

Features

Utilizes 5-bit Johnson counters for clock domain crossing.
BIST features a walking ones pattern generator, controller, ROM, and comparator.

Operating Modes

If BIST = 1, ring counter outputs are compared to ROM values to ensure no lines are shorted together
If BIST = 0, FIFO is in normal operation