M58BF008 datasheet(7/36 Pages) STMICROELECTRONICS

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M58BF008

DEVICE OPERATIONS

See Table 4 for Asynchronous or Synchronous

Bus Operations.

In the Asynchronous mode the memory is selected

with Chip Enable E Low. The data outputs are en-

abled by Output Enable G Low or disabled by Out-

put Disable GD Low. Data is input by Write Enable

W Low.

In the Synchronous mode the memory latches ad-

dresses and data (input or output) on the rising

edge of the System Clock CLK. Burst address

latching is enabled by Load Burst Address LBA

Low with Write/Read WR Low for a write cycle or

High for a read cycle.

Data outputs are enabled for reading on the rising

edge of the System Clock CLK when Output En-

able G is low. Data is input on the rising edge of

the System Clock CLK when Write Enable W is

Low.

The memory is deselected and in standby mode

when Chip Enable E is High, and it is reset or in

power-down mode when Reset/Power-Down RP

is Low.

Read. Read operations are used to output the

contents of the memory, the Electronic Signature

or the Status Register. The data read depends on

the previous Instruction given to the memory.

Read operations can be Asynchronous or Syn-

chronous, with a single or burst read. On power-up

the device is in Asynchronous read mode, the In-

struction Asynchronous/Synchronous Read Tog-

gle ART can be used to enter the Synchronous

read mode.

– Asynchronous Read. To read a data Double-

Word in Asynchronous mode the address inputs

must be stable and Chip Enable E must be Low

during the read cycle. Output Enable G must be

Low and Output Disable GD High. The Load

Burst Address LBA is Don’t Care, but its falling

edge will start a new read cycle.

Table 4. Bus Operations

(1,2)

Note: 1. See Device Operations, Instructions and Commands, sections for more details.

2. X=VIL or VIH.

Table 5. Read Electronic Signature

Note: ”x” = version level. The first version is ”0” and it can have a value up to ”7”.

Operation

CLK

LBA

DQ0-DQ31

Asynchronous Read

VIH

VIL

VIH

VIL

Data Output

Asynchronous Write

VIH

VIL

VIH

Data Input

Synchronous Read

VIH

VIL

VIH

VIL

Data Output

Synchronous Write Address for

Read

VIH

VIL

VIH

Synchronous Write Address for

Command

VIH

VIL

XVIH

VIH

Synchronous Data Write

VIH

VIL

VIH

VIL

VIH

Data Input

Output Disabled by G

VIH

VIL

XXX

VIH

Hi-Z

Output Disabled by GD

VIH

VIL

XXX

VIL

Hi-Z

Standby

VIH

XXXXX

Hi-Z

Reset / Power-down

VIL

XXXXX

Hi-Z

Code

A2-A17

DQ0-DQ31

Manufacturer

VIH

VIL

VIH

VIL

Don’t Care

00000020h

Device

VIH

VIL

VIH

VIL

Don’t Care

000000F0h

Version

VIH

VIL

VIH

VIL

VIH

Don’t Care

0000000xh

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