參數(shù)資料
型號: IDT72811
廠商: Integrated Device Technology, Inc.
英文描述: DUAL CMOS SyncFIFO
中文描述: 雙通道CMOS SyncFIFO
文件頁數(shù): 18/21頁
文件大小: 228K
代理商: IDT72811
5.15
18
COMMERCIAL TEMPERATURE
72801/72811/72821/72831/72841 DUAL CMOS SyncFIFO
256 x 9, 512 x 9, 1024 x 9, 2048 x 9 and 4096 x 9
OPERATING CONFIGURATIONS
SINGLE DEVICE CONFIGURATION —
When FIFO A (B)
is in a Single Device Configuration, the Read Enable 2
RENA2
(
RENB2
) control input can be grounded (see Figure 14). In
WIDTH EXPANSION CONFIGURATION —
Word width
may be increased simply by connecting the corresponding
input control signals of FIFOs A and B. A composite flag
should be created for each of the end-point status flags
EFA
and
EFB
, also
FFA
and
FFB
). The partial status flags
PAEA
,
PAFB
,
PAEA
and
PAFB
can be detected from any one device.
Figure 15 demonstrates an 18-bit word width using the two
FIFOs contained in one IDT72801/72811/72821/72831/72841.
Any word width can be attained by adding additional IDT2801/
72811/72821/72831/72841s.
When the IDT2801/72811/72821/72831/72841 is in a Width
Expansion Configuration, the Read Enable 2 (
RENA2
and
RENB2
) control inputs can be grounded (see Figure 15). In
this configuration, the Write Enable 2/Load (WENA2/
LDA
,
WENB2/
LDB
) pins are set LOW at Reset so that the pin
operates as a control to load and read the programmable flag
offsets.
Figure 15. Block diagram of the two FIFOs contained in one 72801/72811/72821/72831/72841configured for an 18-bit width-expansion
this configuration, the Write Enable 2/Load WENA2/
LDA
(WENB2/
LDB
) pin is set LOW at Reset so that the pin
operates as a control to load and read the programmable flag
offsets.
Figure 14. Block Diagram of One of the 72801/72811/72821/72831/72841's two FIFOs configured as a single device
QA
0
- QA
8
(QB
0
- QB
8
)
DA
0
- DA
8
(DB
0
- DB
8
)
RSA
(
RSB
)
RCLKA (RCLKB)
RENA1
(
RENB1
)
OEA
(
OEB
)
EFA
(
EFB
)
PAEA
(
PAEB
)
RENA2
(
RENB2
)
WCLKA (WCLKB)
WENA1
(
WENB1
)
WENA2/
LDA
(WENB2/
LDB
)
FFA
(
FFB
)
PAFA
(
PAFB
)
IDT
72801
72811
72821
72831
72841
FIFO
A (B)
3034 drw 16
DATA IN
WRITE CLOCK
18
9
RSB
READ CLOCK
9
18
RENB2
RENA2
WRITE ENABLE
FFA
FFB
EFB
OUTPUT ENABLE
READ ENABLE
9
WRITE ENABLE/LOAD
EFA
RSA
RAM
ARRAY
B
256x9
512x9
1024x9
2048x9
4096x9
RAM
ARRAY
A
256x9
512x9
1024x9
2048x9
4096x9
DATA OUT
RCLKA
EMPTY FLAG
RENB1
RENA
1
WENB1
OEB
OEA1
2WENB2/
LDB
RCLKB
WCLKA
WCLKB
WENA1
DA0 - DA8
DB0 - DB8
QA0 - QA8
QB0 - QB8
WENA2/
LDA
RESET
9
FULL FLAG
3034 drw 17
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