AM29F016-75EC datasheet(9/36 Pages) AMD

9 / 36 page

Am29F016

Autoselect

The autoselect mode allows the reading of a binary

code from the device and will identify its manufacturer

and type. This mode is intended for use by program-

ming equipment for the purpose of automatically

matching the device to be programmed with its corre-

sponding programming algorithm. This mode is func-

tional over the entire temperature range of the device.

To activate this mode, the programming equipment

must force VID (11.5 V to 12.5 V) on address pin A9.

Two identifier bytes may then be sequenced from the

device outputs by toggling address A0 from VIL to VIH.

All addresses are don’t cares except A0, A1, and A6

(see Table 2).

The manufacturer and device codes may also be read

via the command register, for instances when the

Am29F016 is erased or programmed in a system with-

out access to high voltage on the A9 pin. The command

sequence is illustrated in Table 5 (see Autoselect Com-

mand Sequence).

Byte 0 (A0 = VIL) represents the manufacturer’s code

(AMD = 01H) and byte 1 (A0 = VIH) the device identifier

code for Am29F016 = ADH. These two bytes are given

in the table below. All identifiers for manufacturer and

device will exhibit odd parity with DQ7 defined as the

parity bit. In order to read the proper device codes

when executing the Autoselect, A1 must be VIL (see

Table 2).

The autoselect mode also facilitates the determination

of sector group protection in the system. By performing

a read operation at the address location XX02H with

the higher order address bits A18, A19, and A20 set to

the desired sector group address, the device will return

01H for a protected sector group and 00H for a

non-protected sector group.

Table 2.

Am29F016 Sector Protection Verify Autoselect Codes

* Outputs 01H at protected sector addresses

Type

A18 to A20

Code

(HEX)

DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0

Manufacturer Code

–AMD

XXX

VIL

01H

000

0000

Am29F016 Device

VIL

VIH

ADH

101

0110

Sector Group Protection

Sector Group

Address

VIL

VIH

VIL

01H*

000

0000

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