8/18/97

Am29F800T/Am29F800B

13

PR E L IM IN A R Y

Table 7.

Am29F800 Command Definitions

Legend:

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 are latched on the falling edge of the WE or CE pulse.

PD = Data to be programmed at location PA. Data is latched on the rising edge of WE or CE pulse.

SA = Address of the sector to be erased. Address bits A18–A12 uniquely select any sector.

Notes:

1. All values are in hexadecimal.

2. See Tables 1 and 2 for description of bus operations.

3. The data is 00H for an unprotected sector group and 01H for a protected sector group. The complete bus address is

composed of the sector address (A18–A12), A1 = 1, and A0 = 0.

4. Read and program functions in non-erasing sectors are allowed in the Erase Suspend mode.

5. Address bits A18–A11 are don’t care for unlock and command cycles.

Command

Sequence

Read/Reset

(Note 2)

Bus

Write

Cycles

Req’d

First Bus

Write Cycle

Second Bus

Read/Write

Cycle

Third Bus Write

Cycle

Fourth Bus

Read/Write

Cycle

Fifth Bus

Write Cycle

Sixth Bus

Write Cycle

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Reset/Read

Word

1XXX

XXF0

RA

RD

Byte

F0

Autoselect

Manufacturer ID

Word

3

555

XXAA

2AA

XX55

555

XX90

XX00

XX01

Byte

AAA

AA

555

55

AAA

90

00

01

Autoselect

Device ID

(Top Boot Block)

Word

3

555

XXAA

2AA

XX55

555

XX90

XX01

22D6

Byte

AAA

AA

555

55

AAA

90

02

D6

Autoselect

Device ID

(Bottom Boot

Block)

Word

3

555

XXAA

2AA

XX55

555

XX90

XX01

2258

Byte

AAA

AA

555

55

AAA

90

02

58

Autoselect

Sector Protect

Verify (Note 3)

Word

3

555

XXAA

2AA

XX55

555

XX90

(SA)

X02

XX00

XX01

Byte

AAA

AA

555

55

AAA

90

(SA)

X04

00

01

Byte Program

Word

4

555

XXAA

2AA

XX55

555

XXA0

PA

PD

Byte

AAA

AA

555

55

AAA

A0

Chip Erase

Word

6

555

XXAA

2AA

XX55

555

XX80

555

XXAA

2AA

XX55

555

XX10

Byte

AAA

AA

555

55

AAA

80

AAA

AA

555

55

AAA

10

Sector Erase

Word

6

555

XXAA

2AA

XX55

555

XX80

555

XXAA

2AA

XX55

SA

XX30

Byte

AAA

AA

555

55

AAA

80

AAA

AA

555

55

30

Erase Suspend

(Note 4)

Word

1XXX

XXB0

Byte

B0

Erase Resume

Word

1XXX

XX30

Byte

30