431 Dual Deque

431 : Dual Deque

  • Author: Andrew Dona-Couch
  • Description: Dual byte-width double-ended queues
  • GitHub repository
  • Clock: 0 Hz

Two independent double-ended queues in one tiny footprint.

How it works

Each deque is an array of flip flops with a pointer to the top. The empty and full status flags for each are directly available on pins. The push and pop inputs as well as data bus lines are multiplexed using the deque select line.

Hold end_select low to operate as a stack. Tie end_select to push to operate as a queue.

How to test

To push (if full is low):

  • Put the data byte on data_in
  • Select which deque to push to with deque_select
  • Select which end to push to with end_select
  • Bring push high for one cycle

To pop (if empty is low):

  • Select which deque to push to with deque_select
  • Select which end to push to with end_select
  • Bring pop high for one cycle

To replace the last element of the deque (if empty is low):

  • Select which deque to push to with deque_select
  • Select which end to push to with end_select
  • Put the new data byte on data_in
  • Bring both push and pop high for one cycle

To read the end of the deque:

  • Select which deque to push to with deque_select
  • Select which end to push to with end_select
  • Wait one cycle
  • Read end of deque from data_out

External hardware

You would probably want to connect this to other devices that would find it useful.

IO

#InputOutputBidirectional
0Data In 0Data Out 0Deque Select
1Data In 1Data Out 1End Select
2Data In 2Data Out 2Push
3Data In 3Data Out 3Pop
4Data In 4Data Out 4Deque 0 Empty
5Data In 5Data Out 5Deque 0 Full
6Data In 6Data Out 6Deque 1 Empty
7Data In 7Data Out 7Deque 1 Full

Chip location

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