HY29F040A Datasheet, PDF(7/40 Page) Hynix Semiconductor – 512K x 8-bit CMOS 5.0 volt-only, Sector Erase Flash Memory

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HY29F040A Datasheet, PDF (7/40 Pages) Hynix Semiconductor – 512K x 8-bit CMOS 5.0 volt-only, Sector Erase Flash Memory

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COMMAND DEFINITIONS

Device operations are selected by writing

specific address and data sequences into the

Command register. Writing incorrect addresses

and data values or writing them in the improper

sequence will reset the device to Read mode.

Table 4 defines the valid register command

sequences. Either Read/Reset command will

reset the device (when applicable).

Table 4. Command Definitions(1,2,3,4)

Command

Sequence

Bus

Write

Cycles

Req'd

First Bus

Write Cycle

Addr Data

Second Bus

Write Cycle

Addr Data

Third Bus

Write Cycle

Addr Data

Fourth Bus

Write Cycle

Fifth Bus

Write Cycle

Sixth Bus

Write Cycle

Addr Data Addr Data Addr Data

Read/Reset

Electronic ID

Byte Program

Chip Erase

Sector Erase

Erase Suspend

Erase Resume

1 XXXH F0H RA

4 5555H AAH 2AAAH 55H 5555H F0H

4 5555H AAH 2AAAH 55H 5555H 90H XX00H ADH

XX01H A4H

4 5555H AAH 2AAAH 55H 5555H A0H

6 5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H 5555H 10H

6 5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H SA 30H

1 XXXH B0H

1 XXXH 30H

Notes:

1. Bus Operations are defined in Table 1.

2. For a Command Sequence, address bits A15, A14, A13, A12, and A11 = X = Donât care. Address bits A18, A17, A16,

and A15 = X = Donât care for all address commands except for Program Address(PA) and Sector Address(SA).

In the case of Sector Address, address bit A15 = X = Donât care for all addresses except for Program Address (PA)

and Sector Addresses (SA).

3. 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 pulse.

PD = Data to be programmed at location PA. Data is latched on the falling edge of /WE.

SA = Address of the sector to be erased (see Table 3).

4. The Erase Suspend (B0H) and Erase Resume (30H) commands are valid only while the Sector Erase operation

is in progress.

HY29F040A

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