IDT72V845 데이터 시트보기 (PDF) - Integrated Device Technology

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IDT72V845

3.3 VOLT CMOS DUAL SyncFIFO DUAL 256 x 18, DUAL 512 x 18, DUAL 1,024 x 18, DUAL 2,048 x 18 and DUAL 4,096 x 18

Integrated Device Technology 

IDT72V805/72V815/72V825/72V835/72V845

3.3 V CMOS DUAL SyncFIFO™ 256 x 18, 512 x 18, 1,024 x 18, 4,096 x 18

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

WRITE EXPANSION OUT/HALF-FULL FLAG

(WXOA/HFA, WXOB/HFB)

This is a dual-purpose output. In the Single Device and Width Expansion

mode, when Write Expansion In (WXIA/WXIB) and/or Read Expansion In

(RXIA/RXIB) are grounded, this output acts as an indication of a half-full

memory.

After half of the memory is filled, and at the LOW-to-HIGH transition of

the next write cycle, the Half-Full flag goes LOW and will remain set until

the difference between the write pointer and read pointer is less than or

equal to one half of the total memory of the device. The Half-Full flag (HFA/

HFB) is then reset to HIGH by the LOW-to-HIGH transition of the Read

Clock (RCLK). The HF is asynchronous.

In the Daisy Chain Depth Expansion mode, WXI is connected to WXO

of the previous device. This output acts as a signal to the next device in

the Daisy Chain by providing a pulse when the previous device writes to

the last location of memory.

READ EXPANSION OUT (RXOA/RXOB)

In the Daisy Chain Depth Expansion configuration, Read Expansion In

(RXIA/RXIB) is connected to Read Expansion Out (RXOA/RXOB) of the

previous device. This output acts as a signal to the next device in the Daisy

Chain by providing a pulse when the previous device reads from the last

location of memory.

DATA OUTPUTS (Q0-Q17, QB0-QB17)

Q0-Q17 are data outputs for 18-bit wide data.

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