IDT72V81 IDT [Integrated Device Technology], IDT72V81 Datasheet - Page 9

• Manufacturer Part Number: IDT72V81
• Description: 3.3 Volt CMOS DUAL ASYNCHRONOUS FIFO DUAL 512 x 9, DUAL 1,024 x 9 DUAL 2,048 x 9, DUAL 4,096 X 9
• Manufacturer: IDT [Integrated Device Technology]

Single Device Configuration/Width Expansion Mode
NOTE:
1. Pointer will increment if flag is High.
Depth Expansion/Compound Expansion Mode
NOTE:
1. XI is connected to XO of previous device. See Figure 14. RS = Reset Input, FL/RT = First Load/Retransmit, EF = Empty Flag Output, FF = Full Flag Output,
Reset
Retransmit
Read/Write
Reset First Device
Reset All Other Devices
Read/Write
IDT72V81/72V82/72V83/72V84/72V85
sion Input, HF = Half-Full Flag Output
Mode
Mode
Figure 14. Block Diagram of 2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9 and 32,768 x 9 FIFO Memory (Depth Expansion)
FULL
RSA
W
D
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
0
1
0
0
1
1
9
Inputs
Inputs
RT
RT
RT
RT
RT
FL FL FL FL FL
X
X
0
1
0
1
9
9
FFA
(1)
(1)
(1)
XI XI XI XI XI
XI XI XI XI XI
FFB
0
0
0
FFA
FFB
9
72V81/72V82
72V83/72V84
72V81/72V82
72V83/72V84
72V85
72V85
Location Zero
Increment
Read Pointer
Location Zero
Location Zero
FIFO A
FIFO B
FIFO A
FIFO B
Location Zero
Read Pointer
XOA
XIB
9
XOA
XIB
X
(1)
FLB
EFA
EFB
FLB
FLA
XIA
XOB
EFA
XOB
EFB
FLA
XIA
Internal Status
Internal Status
Location Zero
Increment
Write Pointer
Location Zero
Location Zero
Unchanged
Write Pointer
9
X
(1)
Commercial Temperature Range
V
R
Q
EMPTY
EF
EF
EF
EF
EF
3966 drw 16
CC
0
X
X
EF
EF
EF
EF
EF
0
0
X
Outputs
Outputs
FF FF FF FF FF
1
X
X
FF FF FF FF FF
X
XI = Expan-
1
1
HF
HF
HF
HF
HF
X
X
1