AM29F032B datasheet(18/39 Pages) AMD

18 / 39 page

Am29F032B

Command Definitions

Table 5.

Am29F032B Command Definitions

Legend:

X = Don’t care

RA = Address of the memory location to be read.

RD = Data read from location RA during read operation.

PA = Address of the memory location to be programmed.

Addresses latch on the falling edge of the WE# or CE# pulse,

whichever happens later.

PD = Data to be programmed at location PA. Data latches on

the rising edge of WE# or CE# pulse, whichever happens first.

SA = Address of the sector to be verified (in autoselect mode)

or erased. Address bits A21–A16 select a unique sector.

SGA = Address of the sector group to be verified. Address

bits A21–A18 select a unique sector group.

Notes:

1. See Table 1 for description of bus operations.

2. All values are in hexadecimal.

3. Except when reading array or autoselect data, all bus

cycles are write operations.

4. Address bits A21–A11 are don’t cares for unlock and

command cycles, unless SA or PA required.

5. No unlock or command cycles required when reading

array data.

6. The Reset command is required to return to reading array

data when device is in the autoselect mode, or if DQ5

goes high (while the device is providing status data).

7. The fourth cycle of the autoselect command sequence is

a read cycle.

8. The data is 00h for an unprotected sector group and 01h

for a protected sector group.See “Autoselect Command

Sequence” for more information.

9. The system may read and program in non-erasing

sectors, or enter the autoselect mode, when in the Erase

Suspend mode. The Erase Suspend command is valid

only during a sector erase operation.

10. The Erase Resume command is valid only during the

Erase Suspend mode.

Command

Sequence

(Note 1)

Bus Cycles (Notes 2–4)

First

Second

Third

Fourth

Fifth

Sixth

Addr

Data

Addr

Data

Addr

Data Addr

Data

Addr Data

Addr

Data

Read (Note 5)

Reset (Note 6)

XXX

Autoselect

(Note 7)

Manufacturer ID

555

2AA

555

X00

Device ID

555

2AA

555

X01

Sector Group Protect

Verify (Note 8)

555

2AA

555

SGA

X02

XX00

XX01

Program

555

2AA

555

Chip Erase

555

2AA

555

2AA

555

Sector Erase

555

2AA

555

2AA

Erase Suspend (Note 9)

XXX

Erase Resume (Note 10)

XXX

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