IDT72805LB/72815LB/72825LB/72835LB/72845LB CMOS Dual SyncFIFOTM
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� IDT72825LB15PFI8
寤犲晢锛� IDT, Integrated Device Technology Inc
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 17/26闋�(y猫)
鏂囦欢澶у皬锛� 0K
鎻忚堪锛� IC FIFO SYNC DL 1024X18 128TQFP
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 1,000
绯诲垪锛� 7200
鍔熻兘锛� 鍚屾
瀛樺劜(ch菙)瀹归噺锛� 18.4K锛�1K x 18锛�
鏁�(sh霉)鎿�(j霉)閫熺巼锛� 67MHz
瑷晱(w猫n)鏅�(sh铆)闁擄細 15ns
闆绘簮闆诲锛� 4.5 V ~ 5.5 V
宸ヤ綔婧害锛� -40°C ~ 85°C
瀹夎椤�(l猫i)鍨嬶細 琛ㄩ潰璨艰
灏佽/澶栨锛� 128-LQFP
渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 128-TQFP锛�14x20锛�
鍖呰锛� 甯跺嵎 (TR)
鍏跺畠鍚嶇ū锛� 72825LB15PFI8
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72805LB/72815LB/72825LB/72835LB/72845LB CMOS Dual SyncFIFOTM
256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18 and 4,096 x 18
24
JANUARY 13, 2009
Figure 30. Block Diagram of 8,192 x 18 Synchronous
FIFO Memory With Programmable Flags used in Depth Expansion Configuration
DEPTH EXPANSION CONFIGURATION 鈥� DAISY CHAIN TECHNIQUE
(WITH PROGRAMMABLE FLAGS)
These devices can easily be adapted to applications requiring more than
256/512/1,024/2,048/4,096 words of buffering. Figure 30 shows Depth
Expansion using one IDT72805LB/72815LB/72825LB/72835LB/72845LBs.
Maximum depth is limited only by signal loading. Follow these steps:
1.ThefirstdevicemustbedesignatedbygroundingtheFirstLoad(
FL)controlinput.
2. All other devices must have
FL in the HIGH state.
3. The Write Expansion Out (
WXO) pin of each device must be tied to the
Write Expansion In (
WXI) pin of the next device. See Figure 30.
4. The Read Expansion Out (
RXO) pin of each device must be tied to the
Read Expansion In (
RXI) pin of the next device. See Figure 30.
5. All Load (
LD) pins are tied together.
6. The Half-Full flag (
HF) is not available in this Depth Expansion
Configuration.
7.
EF, FF, PAE, and PAF are created with composite flags by ORing
together every respective flags for monitoring. The composite
PAE and
PAF flags are not precise.
8. In Daisy Chain mode, the flag outputs are single register-buffered and
the partial flags are in asynchronous timing mode.
LOAD
WRITE CLOCK
WRITE ENABLE
READ CLOCK
READ ENABLE
OUTPUT ENABLE
DATA IN
DATA OUT
RESET
FIRST LOAD (FL)
Vcc
WXOA
WXIA
RXOA
RXIA
WXOB
WXIB
RXOB
RXIB
IDT72845
FFA/IRA
PAFA
EFA/ORA
PAEA
PAFB
PAEB
EF/OR
PAE
FF/IR
PAF
3139 drw 30
RCLKB
RENB
OEB
WCLKB
WENB
RSB
FLA
RCLKA
RENA
OEA
WCLKA
WENA
RSA
LDA
DAn
QAn
DBn
QBn
LDB
FIFO A
4,096 x 18
FIFO B
4,096 x 18
FFA/IRA EFA/ORA
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