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IDT723676L15PF

CMOS TRIPLE BUS SyncFIFO™ WITH BUS-MATCHING 2,048 x 36 x 2 4,096 x 36 x 2 8,192 x 36 x 2

Integrated Device Technology 

IDT723656/723666/723676 CMOS TRIPLE BUS SyncFIFOTM WITH

BUS MATCHING 2,048 x 36 x 2, 4,096 x 36 x 2 and 8,192 x 36 x 2

COMMERCIAL TEMPERATURE RANGE

PIN DESCRIPTIONS

Symbol

Name

I/O

A0-A35 Port A Data

I/O

AEA

Port A Almost-

O

Empty Flag

AEB

Port B Almost-

O

Empty Flag

AFA

Port A Almost-

O

Full Flag

AFC

Port C Almost-

O

Full Flag

B0-B17 Port B Data

O

BE/FWFT Big-Endian/

I

First Word Fall

Through Select

C0-C17 Port C Data

I

CLKA

Port A Clock

I

CLKB

Port B Clock

I

CLKC

Port C Clock

I

CSA

Port A Chip

I

Select

CSB

Port B Chip

I

Select

EFA/ORA Port A Empty/

O

Output Ready

Flag

EFB/ORB Port B Empty/

O

Output Ready Flag

ENA

Port A Enable

I

FFA/IRA Port A Full/

O

Input Ready Flag

FFC/IRC Port C Full/

O

Input Ready Flag

Description

36-bit bidirectional data port for side A.

Programmable Almost-Empty flag synchronized to CLKA. It is LOW when the number of words in FIFO2

is less than or equal to the value in the Almost-Empty A Offset register, X2.

Programmable Almost-Empty flag synchronized to CLKB. It is LOW when the number of words in FIFO1

is less than or equal to the value in the Almost-Empty B Offset register, X1.

Programmable Almost-Full flag synchronized to CLKA. It is LOW when the number of empty locations

in FIFO1 is less than or equal to the value in the Almost-Full A Offset register, Y1.

Programmable Almost-Full flag synchronized to CLKC. It is LOW when the number of empty locations

in FIFO2 is less than or equal to the value in the Almost-Full C Offset register, Y2.

18-bit output data port for side B.

This is a dual purpose pin. During Master Reset, a HIGH on BE will select Big-Endian operation.

In this case, depending on the bus size, the most significant byte or word on Port A is read from

Port B first (A-to-B data flow) or is written to Port C first (C-to-A data flow). A LOW on BE will select

Little-Endian operation. In this case, the least significant byte or word on Port A is read from Port B first

(A-to-B data flow) or is written to Port C first (C-to-A data flow).

After Master Reset, this pin selects the timing mode. A HIGH on FWFT selects IDT Standard mode, a

LOW selects First Word Fall Through mode. Once the timing mode has been selected, the level on

FWFT must be static throughout device operation.

18-bit input data port for side C.

CLKA is a continuous clock that synchronizes all data transfers through Port A and can be

asynchronous or coincident to CLKB. FFA/IRA, EFA/ORA, AFA, and AEA are all synchronized to

the LOW-to-HIGH transition of CLKA.

CLKB is a continuous clock that synchronizes all data transfers through Port B and can be asynchronous

or coincident to CLKA. EFB/ORB and AEB are synchronized to the LOW-to-HIGH transition of CLKB.

CLKC is a continuous clock that synchronizes all data transfers through Port C and can be asynchronous

or coincident to CLKA. FFC/IRC and AFC are synchronized to the LOW-to-HIGH transition of CLKC.

CSA must be LOW to enable to LOW-to-HIGH transition of CLKA to read or write on Port A. The A0-A35

outputs are in the high-impedance state when CSA is HIGH.

CSB must be LOW to enable a LOW-to-HIGH transition of CLKB to read data on Port B. The B0-B17

outputs are in the high-impedance state when CSB is HIGH.

This is a dual function pin. In the IDT Standard mode, the EFA function is selected. EFA indicates

whether or not the FIFO2 memory is empty. In the FWFT mode, the ORA function is selected. ORA

indicates the presence of valid data on the A0-A35 outputs, available for reading. EFA/ORA is

synchronized to the LOW-to-HIGH transition of CLKA.

This is a dual function pin. In the IDT Standard mode, the EFB function is selected. EFB indicates

whether or not the FIFO1 memory is empty. In the FWFT mode, the ORB function is selected. ORB

indicates the presence of valid data on the B0-B17 outputs, available for reading. EFB/ORB is synchronized

to the LOW-to-HIGH transition of CLKB.

ENA must be HIGH to enable a LOW-to-HIGH transition of CLKA to read or write data on Port A.

This is a dual function pin. In the IDT Standard mode, the FFA function is selected. FFA indicates

whether or not the FIFO1 memory is full. In the FWFT mode, the IRA function is selected. IRA

indicates whether or not there is space available for writing to the FIFO1 memory. FFA/IRA is

synchronized to the LOW-to-HIGH transition of CLKA.

This is a dual function pin. In the IDT Standard mode, the FFC function is selected. FFC indicates

whether or not the FIFO2 memory is full. In the FWFT mode, the IRC function is selected. IRC

indicates whether or not there is space available for writing to the FIFO2 memory. FFC/IRC is

synchronized to the LOW-to-HIGH transition of CLKC.

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