IDT70V659S(2008) Ver la hoja de datos (PDF) - Integrated Device Technology

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IDT70V659S
(Rev.:2008)

HIGH-SPEED 3.3V 128/64/32K x 36 ASYNCHRONOUS DUAL-PORT STATIC RAM

Integrated Device Technology 

IDT70V659/58/57S

High-Speed 3.3V 128/64/32K x 36 Asynchronous Dual-Port Static RAM

Industrial and Commercial Temperature Ranges

Truth Table I—Read/Write and Enable Control(1,2)

OE SEM CE0 CE1 BE3 BE2 BE1 BE0 R/W

Byte 3

I/O27-35

Byte 2

I/O18-26

Byte 1

I/O9-17

Byte 0

I/O0-8

MODE

X H H X X X X X X High-Z High-Z High-Z High-Z Deselected–Power Down

X H X L X X X X X High-Z High-Z High-Z High-Z Deselected–Power Down

X H L H H H H H X High-Z High-Z High-Z High-Z All Bytes Deselected

X H L H H H H L L High-Z High-Z High-Z

DIN Write to Byte 0 Only

X H L H H H L H L High-Z High-Z

DIN

High-Z Write to Byte 1 Only

X H L H H L H H L High-Z

DIN

High-Z High-Z Write to Byte 2 Only

XHL HL HHHL

DIN

High-Z High-Z High-Z Write to Byte 3 Only

X H L H H H L L L High-Z High-Z

DIN

DIN Write to Lower 2 Bytes Only

XHL HL L HHL

DIN

DIN

High-Z High-Z Write to Upper 2 bytes Only

XHLHL L L L L

DIN

DIN

DIN

DIN Write to All Bytes

L

HL

HHHHL

H High-Z High-Z High-Z

DOUT Read Byte 0 Only

L

HL

HHH

L

H H High-Z High-Z

DOUT

High-Z Read Byte 1 Only

L

HL

HHL

H H H High-Z

DOUT

High-Z High-Z Read Byte 2 Only

L

HL

HL

HHHH

DOUT

High-Z High-Z High-Z Read Byte 3 Only

L

HL

HHH

L

L

H High-Z High-Z

DOUT

DOUT Read Lower 2 Bytes Only

L

HL

HL

L

HHH

DOUT

DOUT

High-Z High-Z Read Upper 2 Bytes Only

L

HL

HL

L

L

L

H

DOUT

DOUT

DOUT

DOUT Read All Bytes

H H L H L L L L X High-Z High-Z High-Z High-Z Outputs Disabled

NOTES:

1. "H" = VIH, "L" = VIL, "X" = Don't Care.

2. It is possible to read or write any combination of bytes during a given access. A few representative samples have been illustrated here.

4869 tbl 02

Truth Table II – Semaphore Read/Write Control(1)

Inputs(1)

Outputs

CE(2)

R/W

OE

BE3

BE2

BE1

BE0

SEM

I/O1-35

I/O0

Mode

H

H

L

L

L

L

L

L

DATAOUT DATAOUT Read Data in Semaphore Flag(3)

H

↑

X

X

X

X

L

L

X

DATAIN Write I/O0 into Semaphore Flag

L

X

X

X

X

X

X

L

______

______

Not Allowed

NOTES:

1. There are eight semaphore flags written to I/O0 and read from all the I/Os (I/O0-I/O35). These eight semaphore flags are addressed by A0-A2.

2. CE = L occurs when CE0 = VIL and CE1 = VIH.

3. Each byte is controlled by the respective BEn. To read data BEn = VIL.

4869 tbl 03

7

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