IDT72511 데이터 시트보기 (PDF) - Integrated Device Technology

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IDT72511

PARALLEL BIDIRECTIONAL FIFO 512 x 18 & 1024 x 18

Integrated Device Technology 

IDT72511/IDT72521

BIDIRECTIONAL FIRST-IN FIRST-OUT MEMORY

MILITARY AND COMMERCIAL TEMPERATURE RANGES

CONFIGURATION REGISTER FORMATS

15

10 9

0

Config. Reg. 0 X X X X X X

A→B FIFO Almost Empty Flag Offset

15

10 9

0

Config. Reg. 1 X X X X X X

A→B FIFO Almost Full Flag Offset

15

10 9

0

Config. Reg. 2 X X X X X X

B→A FIFO Almost Empty Flag Offset

15

10 9

0

Config. Reg. 3 X X X X X X

B→A FIFO Almost Full Flag Offset

Config. Reg. 4

15

12

Flag D Pin Assignment

11

8

Flag C Pin Assignment

7

4

Flag B Pin Assignment

3

0

Flag A Pin Assignment

15

0

Config. Reg. 5

General Control

15

0

Config. Reg. 6

I/O Data

15

0

Config. Reg. 7

I/O Direction Control

NOTE:

1. Bit 9 of Configuration Registers 0-3 must be set to 0 on the IDT72511.

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Table 8. The BiFIFO Configuration Register Formats

Programmable Flags

The IDT BiFIFO has eight internal flags. Associated with

each FIFO memory array are four internal flags, Empty,

Almost-Empty, Almost-Full and Full, for the total of eight

internal flags. The Almost-Empty and Almost-Full offsets can

be set to any depth through the Configuration Registers 0-3

(see Table 8). The flags are asserted at the depths shown in

Table 11. After a hardware reset or a software Reset All, the

almost flag offsets are set to 0. Even though the offsets are

equivalent, the Empty and Almost-Empty flags have different

timing which means that the flags are not coincident. Similarly,

the Full and Almost-Full flags are not coincident after reset

because of timing.

These eight internal flags can be assigned to any of four

external flag pins (FLGA-FLGD) through Configuration Regis-

ter 4 (see Table 9). For the specific flag timings, see Figures

20-23.

The current state of all eight flags is available in the Status

Register.

EXTERNAL FLAG ASSIGNMENT CODES

Assignment

Code

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

Internal Flag Assigned to Flag Pin

A→B Empty

A→B Almost-Empty

A→B Full

A→B Almost-Full

B→A Empty

B→A Almost-Empty

B→A Full

B→A Almost-Full

A→B Empty

A→B Almost-Empty

A→B Full

A→B Almost-Full

B→A Empty

B→A Almost-Empty

B→A Full

B→A Almost-Full

2668 tbl 11

Table 9. Configuration Register 4 Internal Flag Assignments to

External Flag Pins

5.32

10

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