AM29F040B-120JE データシートの表示（PDF） - Advanced Micro Devices

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AM29F040B-120JE

4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory

Advanced Micro Devices 

PRELIMINARY

The device enters the CMOS standby mode when the

CE# pin is held at VCC ± 0.5 V. (Note that this is a more

restricted voltage range than VIH.) The device enters

the TTL standby mode when CE# is held at VIH. The

device requires the standard access time (tCE) before it

is ready to read data.

If the device is deselected during erasure or program-

ming, the device draws active current until the

operation is completed.

ICC3 in the DC Characteristics tables represents the

standby current specification.

Output Disable Mode

When the OE# input is at VIH, output from the device is

disabled. The output pins are placed in the high imped-

ance state.

Sector

A18

SA0

0

SA1

0

SA2

0

SA3

0

SA4

1

SA5

1

SA6

1

SA7

1

Note: All sectors are 64 Kbytes in size.

Table 2. Sector Addresses Table

A17

A16

0

0

0

1

1

0

1

1

0

0

0

1

1

0

1

1

Address Range

00000h–0FFFFh

10000h–1FFFFh

20000h–2FFFFh

30000h–3FFFFh

40000h–4FFFFh

50000h–5FFFFh

60000h–6FFFFh

70000h–7FFFFh

Autoselect Mode

The autoselect mode provides manufacturer and de-

vice identification, and sector protection verification,

through identifier codes output on DQ7–DQ0. This

mode is primarily intended for programming equipment

to automatically match a device to be programmed with

its corresponding programming algorithm. However,

the autoselect codes can also be accessed in-system

through the command register.

When using programming equipment, the autoselect

mode requires VID (11.5 V to 12.5 V) on address pin

A9. Address pins A6, A1, and A0 must be as shown in

Autoselect Codes (High Voltage Method) table. In addi-

tion, when verifying sector protection, the sector ad-

dress must appear on the appropriate highest order

address bits. Refer to the corresponding Sector Ad-

dress Tables. The Command Definitions table shows

the remaining address bits that are don’t care. When all

necessary bits have been set as required, the program-

ming equipment may then read the corresponding

identifier code on DQ7–DQ0.

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in the Command Defini-

tions table. This method does not require VID. See

“Command Definitions” for details on using the autose-

lect mode.

Am29F040B

7

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