IDT72521L25JB datasheet(11/28 Pages) IDT

Part #	IDT72521L25JB

Description	PARALLEL BIDIRECTIONAL FIFO 512 x 18 & 1024 x 18

Download	28 Pages

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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IDT72511/IDT72521

BIDIRECTIONAL FIRST-IN FIRST-OUT MEMORY

MILITARY AND COMMERCIAL TEMPERATURE RANGES

5.32

11

Bit

Function

0

Select Port B Interface

0

Pins are

RB and WB (Intel-style interface)

RB and WB or DSB and R/WB

1

Pins are

DSB and R/WB (Motorola-style interface)

1

Unused

2

Full Flag Definition

0

Write pointer meets read pointer

1

Write pointer meets reread pointer

3

Empty Flag Definition

0

Read pointer meets write pointer

1

Read pointer meets rewrite pointer

4

REQ Pin Polarity

0

REQ pin active HIGH

1

REQ pin active LOW

5

ACK Pin Polarity

0

ACK pin active LOW

1

ACK pin active HIGH

7-6

REQ / ACK Timing

00

2 internal clocks between REQ assertion and ACK assertion

01

3 internal clocks between REQ assertion and ACK assertion

10

4 internal clocks between REQ assertion and ACK assertion

11

5 internal clocks between REQ assertion and ACK assertion

8

Port B Read & Write

0

RB, WB, and DSB are asserted for 1 internal clock

Timing Control for Peripheral Mode

1

RB, WB, and DSB are asserted for 2 internal clocks

9

Internal Clock

0

Internal clock = CLK

Frequency Control

1

Internal clock = CLK divided by 2

10

Port B Interface

0

Processor interface mode (Port B controls are inputs)

Mode Control

1

Peripheral interface mode (Port B controls are outputs)

11

Unused

12

Unused

13

Unused

14

Unused

15

Unused

CONFIGURATION REGISTER 5 FORMAT

15

6

5

4

3

2

1

0

Unused

PIO5

PIO4

PIO3

PIO2

PIO1

PIO0

2668 tbl 13

Figure 4. BiFIFO Configuration Register 6 Format for Programmable I/O Data

CONFIGURATION REGISTER 7 FORMAT

2668 tbl 14

Figure 5. BiFIFO Configuration Register 7 Format for Programmable I/O Direction Mask

Unused

MIO5

MIO4

MIO3

MIO2

MIO1

MIO0

15

6

5

4

3

2

1

0

2668 tbl 12

Table 10. BiFIFO Configuration Register 5 Format

CONFIGURATION REGISTER 6 FORMAT

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