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FIFO Design
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This presentation outlines the fundamentals of FIFO Design.
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FIFO Design
1.
FIFO Design Aditya
Mittal
2.
Objective • Use Design
Framework • Request/Grant Handshake • Valid/Busy Handshake © Arrow Devices Pvt. Ltd. 2
3.
FIFO Interface
© Arrow Devices Pvt. Ltd. 3
4.
FIFO Protocol • FIFO
not guaranteed to work if protocol violated • Write Data qualified by Push • Read Data validated by !Empty • Should not Push when Full • Should not Pop when Empty © Arrow Devices Pvt. Ltd. 4
5.
FIFO Protocol
© Arrow Devices Pvt. Ltd. 5
6.
FIFO Datapath • Input
Data (bus) • Output Data (bus) • Data Store (memory /flop array) © Arrow Devices Pvt. Ltd. 6
7.
FIFO Datapath
© Arrow Devices Pvt. Ltd. 7
8.
FIFO Control Path •
Data Path Control – Write Control – Read Control • Flow Control © Arrow Devices Pvt. Ltd. 8
9.
FIFO Write Control •
Write Pointer: Next memory address to write • Convention: Push causes write pointer to move to next location • Decode of write pointer enables memory locations © Arrow Devices Pvt. Ltd. 9
10.
FIFO Read Control •
Read Pointer: Next memory address to read • Convention: Pop causes read pointer to move to next location © Arrow Devices Pvt. Ltd. 10
11.
FIFO Read/Write
© Arrow Devices Pvt. Ltd. 11
12.
FIFO Flow Control •
Write Interface: Full signal • Read Interface: Empty signal © Arrow Devices Pvt. Ltd. 12
13.
© Arrow Devices
Pvt. Ltd. 13
14.
FIFO Full Generation •
Full Condition: Both pointers are pointing to same location © Arrow Devices Pvt. Ltd. 14
15.
FIFO Empty Generation •
Empty Condition: Both pointers are pointing to same location © Arrow Devices Pvt. Ltd. 15
16.
Pointer Wrap State •
Set wrap bit every time pointer “wraps around” the max value © Arrow Devices Pvt. Ltd. 16
17.
FIFO Full/Empty
Conditions • Full when pointer values are same and wrap states are different • Empty when pointer values are same and wrap states are same © Arrow Devices Pvt. Ltd. 17