AM29F100T-75FE データシートの表示（PDF） - Advanced Micro Devices

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AM29F100T-75FE

1 Megabit (131,072 x 8-Bit/65,536 x 16-Bit) CMOS 5.0 Volt-only, Sector Erase Flash Memory

Advanced Micro Devices 

AMD

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

ance state, independent of the OE input.

Output Disable

With the OE input at a logic high level (VIH), output from

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

be in a high impedance state.

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 programming

equipment for the purpose of automatically matching

the device to be programmed with its corresponding

programming algorithm. This mode is functional 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 2.1).

The manufacturer and device codes may also be read

via the command register, for instances when the

Am29F100 is erased or programmed in a system with-

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

sequence is illustrated in Table 4 (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 (Am29F100T = D9H and Am29F100B = DFH for

x8 mode; Am29F100T = 22D9H and Am29F100B =

22DFH for x16 mode). These two bytes/words 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 Tables

2.1 and 2.2).

The autoselect mode also facilitates the determination

of sector protection in the system. By performing a read

operation at the address location XX02H with the higher

order address bits A12 – A15 set to the desired sector

address, the device will return 01H for a protected sector

and 00H for a non-protected sector.

Table 2.1 Am29F100 Sector Protection Verify Autoselect Codes

Type

A12–A15

A6

A1

A0

Manufacturer Code–AMD

X

VIL

VIL

VIL

Byte

Am29F100T

X

VIL

VIL

VIH

Am29F100

Word

Device

Byte

Am29F100B

X

VIL

VIL

VIH

Word

Sector Protection

Sector

Address

VIL

VIH

VIL

*Outputs 01H at protected sector addresses

Code (HEX)

01H

D9H

22D9H

DFH

22DFH

01H*

Table 2.2 Expanded Autoselect Code Table

Type

DD D D D D D

QQ Q Q Q Q Q

Code 15 14 13 12 11 10 9

D D D D D DD D D

Q Q Q Q Q QQ Q Q

8 7 6 5 4 32 1 0

Manufacturer Code–AMD 01H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1

Am29F100T(B) D9H A–1 HI–Z HI–Z HI–Z HI–Z HI–Z HI–Z HI–Z 1 1 0 1 1 0 0 1

Am29F100

(W) 22D9H 0 0 1 0 0 0 1 0 1 1 0 1 1 0 0 1

Device

Am29F100B(B) DFH A–1 HI–Z HI–Z HI–Z HI–Z HI–Z HI–Z HI–Z 1 1 0 1 1 1 1 1

(W) 22DFH 0 0 1 0 0 0 1 0 1 1 0 1 1 1 1 1

Sector Protection

01H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1

(B) – Byte mode

(W) – Word mode

1-40

Am29F100T/Am29F100B

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