IDT72511/IDT72521
BIDIRECTIONAL FIRST-IN FIRST-OUT MEMORY
B→A READ BYPASS
R/WA
MILITARY AND COMMERCIAL TEMPERATURE RANGES
taS
taH
DSA
DA0–DA7,
DA16
RB (or DSB)
t aLZ
tBYA
taDV
(1)
BYTE 0 BYTE 1
taHZ
tBYD
tBYD
BYTE 2
(R/WB)
DB0–DB8
t BYD
BYTE 0
tBYD
(1)
BYTE 1
NOTES:
1. Once the bypass mode starts, any data change on Port B bus (Byte 0→Byte 1) will be passed to Port A bus.
2. WB = 1
tBYD
BYTE 2
A→B WRITE BYPASS
R/WA
DSA
DA0–DA7,
DA16
WB (or DSB)
taS
tBYD
(1)
BYTE 0
tBYD
BYTE 1
taH
BYTE 2
tBYD
tBYD
(R/WB)
DB0–DB8
tb BYDV
taBYDV
t bLZ
(1)
BYTE 0 BYTE 1
BYTE 2
tBYA
tbHZ
NOTES:
1. Once the bypass mode starts, any data change on Port A bus (Byte 0→Byte 1) will be passed to Port B bus.
2. RB = 1
Figure 16. Bypass Path Timing, BiFIFO Must Be in Peripheral Interface Mode
5.32
tBYD
2668 drw 17
23