8

Am29F800T/Am29F800B

8/18/97

PR E L IM IN A R Y

Table 1.

Table 2.

Legend:

L = logic 0, H = logic 1, X = Don’t Care. See Characteristics for voltage levels.

Notes:

1. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Table 7.

2. Refer to the section on Sector Protection.

Read Mode

The Am29F800 has two control functions which must

be satisfied in order to obtain data at the outputs. CE is

the power control and should be used for device selec-

tion. OE is the output control and should be used to

gate data to the output pins if a device is selected.

stable addresses to valid output data. The chip enable

and stable CE to valid data at the output pins.

The output enable access time is the delay from the

fa lling edge of OE to va lid data at the output

pins (assuming the addresses have been stable for at

Standby Mode

There are two ways to implement the standby mode on

the Am29F800 device, both using the CE pin.

A CMOS standby mode is achieved with the CE input

typically reduced to less than 5

µA. A TTL standby

this condition the current is typically reduced to 1 mA.

Operation

CE

OE

WE

A0

A1

A6

A9

DQ0–DQ15

RESET

Autoselect, AMD Manuf. Code (Note 1)

L

L

H

L

L

L

Code

H

Autoselect Device Code (Note 1)

L

L

H

H

L

L

Code

H

Read

L

L

X

A0A1A6A9

H

Standby

H

XXXX

XX

HIGH Z

H

Output Disable

L

H

H

X

X

X

X

HIGH Z

H

Write

L

H

L

A0

A1

A6

A9

H

Verify Sector Protect (Note 2)

L

L

H

L

H

L

Code

H

Temporary Sector Unprotect

X

XXXX

XX

X

Hardware Reset

X

XXXX

XX

HIGH Z

L

Operation

CE

OE

WE

A0

A1

A6

A9

DQ0–DQ7 DQ8–DQ15 RESET

Autoselect, AMD Manuf. Code

(Note 1)

L

L

H

LLL

Code

HIGH Z

H

Autoselect Device Code (Note 1)

L

L

H

H

L

L

Code

HIGH Z

H

Read

L

L

X

A0A1A6A9

HIGH Z

H

Standby

H

X

XXXXX

HIGH Z

HIGH Z

H

Output Disable

L

H

H

XXXX

HIGH Z

HIGH Z

H

Write

L

H

L

A0

A1

A6

A9

HIGH Z

H

Verify

Sector Protect (Note 2)

L

L

HLHL

Code

HIGH Z

H

Temporary

Sector Unprotect

XX

XXXXX

X

HIGH Z

Hardware Reset

X

X

XXXXX

HIGH Z

HIGH Z

L