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9

EN29F080

Rev. C, Issue Date: 2001/07/05

COMMAND DEFINITIONS

The operations of the EN29F080 are selected by one or more commands written into the command

register to perform Read/Reset Memory, Read ID, Read Sector Protection, Program, Sector Erase,

Chip Erase, Erase Suspend and Erase Resume. Commands are made up of data sequences

written at specific addresses via the command register. The sequences for the specified operation

are defined in the Command Definitions table (Table 5). Incorrect addresses, incorrect data values

or improper sequences will reset the device to Read Mode.

Table 5. EN29F080 Command Definitions

1

st

Write Cycle

2

nd

Write Cycle

3

rd

Write Cycle

4

th

Write Cycle

5

th

Write Cycle

6

th

Write Cycle

Command

Sequence

Read/Reset

Cycles

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Reset

1

XXXh

F0h

Read

4

RA

RD

AutoSelect

Manufacturer ID

4

555h

AAh

2AAh

55h

555h

90h

X100h

1c

AutoSelect Device ID

4

555h

AAh

2AAh

55h

555h

90h

X101h

08

AutoSelect Sector

Protect Verify

4

555h

AAh

2AAh

55h

555h

90h

BA &

02h

00h/

01h

Byte Program

4

555h

AAh

2AAh

55h

555h

A0h

PA

PD

Chip Erase

6

555h

AAh

2AAh

55h

555h

80h

555h

AAh 2AAh 55h

555h

10h

Sector Erase

6

555h

AAh

2AAh

55h

555h

80h

555h

AAh 2AAh 55h

BA

30h

Sector Erase Suspend

1

xxxh

B0h

Sector Erase Resume

1

xxxh

30h

RA = Read Address: address of the memory location to be read. This one is a read cycle.

RD = Read Data: data read from location RA during Read operation. This one is a read cycle.

PA = Program Address: address of the memory location to be programmed

PD = Program Data: data to be programmed at location PA

BA = Sector Address: address of the Sector to be erased or verified. Address bits A17-A13 uniquely select any Sector.

Reading Array Data

The device is automatically set to reading array data after power up. No commands are required to

retrieve data. The device is also ready to read array data after completing an Embedded Program or

Embedded Erase algorithm.

Following an Erase Suspend command, Erase Suspend mode is entered. The system can read array data

using the standard read timings, with the only difference in that if it reads at an address within erase

suspended sectors, the device outputs status data. After completing a programming operation in the Erase

Suspend mode, the system may once again read array data with the same exception.

The Reset command must be issued to re-enable the device for reading array data if DQ5 goes high, or while

in the autoselect mode. See next section for details on Reset.

Reset Command

Writing the reset command to the device resets the device to reading array data. Address bits are don’t-

care for this command.

The reset command may be written between the sequence cycles in an erase command sequence before

erasing begins. This resets the device to reading array data. Once erasure begins, however, the device

ignores reset commands until the operation is complete. The reset command may be written between the

sequence cycles in a program command sequence before programming begins. This resets the device to

reading array data (also applies to programming in Erase Suspend mode). Once programming begins,

however, the device ignores reset commands until the operation is complete.