8

Am29F016

Table 1.

Am29F016 User Bus Operations

Legend:

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

Notes:

1. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Table 5.

2. Refer to the section on Sector Group Protection.

Read Mode

The Am29F016 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 the device is selected.

stable addresses to valid output data. The chip

addresses and stable CE to valid data at the output

pins. The output enable access time is the delay from

the falling edge of OE to valid 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 Am29F016 device, one using both the CE and

RESET pins; the other via the RESET pin only.

When using both pins, a CMOS standby mode is

± 0.3 V. Under this condition the current is typically

reduced to less than 1

µA. A TTL standby mode is

this condition the current is typically reduced to 200

µA.

When using the RESET pin only, a CMOS standby

(CE = don’t care). Under this condition the current is typ-

ically reduced to less than 1

µA. A TTL standby mode is

Under this condition the current is typically reduced to

less than 200

µA. Once the RESET pin is taken high,

the device requires 50 ns of wake up time before out-

puts are valid for read access.

In the standby mode the outputs are in the high imped-

ance state, independent of the OE input.

Output Disable

the device is disabled. This will cause the output pins to

be in a high impedance state.

Operation

CE

OE

WE

A0

A1

A6

A9

DQ0

RESET

Autoselect, AMD Manuf. Code (1)

L

L

H

L

L

L

Code

H

Autoselect Device Code (1)

L

L

H

H

L

L

Code

H

Read

L

L

X

A0

A1

A6

A9

H

Standby

H

X

X

X

X

X

X

HIGH Z

H

Output Disable

L

H

H

XXX

X

HIGH Z

H

Write

L

H

L

A0

A1

A6

A9

H

Enable Sector Group Protect (2)

L

L

XXX

XH

Verify Sector Group Protect (2)

L

L

H

L

H

L

Code

H

Temporary Sector Group Unprotect

X

X

X

X

X

X

X

X

Hardware Reset/Standby

XXX

XXX

X

HIGH Z

L