TMS28F008AXY datasheet(23/52 Pages) TI

23 / 52 page

TMS28F008Axy,TMS28F800Axy

1 048 576 BY 8-BIT/524 288 BY 16-BIT

AUTO-SELECT BOOT-BLOCK FLASH MEMORIES

SMJS851A – NOVEMBER 1997 – REVISED MARCH 1998

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

BUS

OPERATION

COMMAND

COMMENTS

Write

Write erase

setup

Data = 20h

Block Addr = Address

within

block to

erased

Write

Erase

Data = D0h

Block Addr = Address

within

block to

erased

Read

Status-register data.

Toggle OE or CE to

update status register

Standby

Check SB7

1 = Ready, 0 = Busy

Repeat for subsequent blocks.

Write FFh after the last block-erase operation to reset the

device to read-array mode

BUS

OPERATION

COMMAND

COMMENTS

Standby

Check SB3

1 = Detect VPP low

(see Note B)

Standby

Check SB4 and SB5

1 = Block-erase

error

Standby

Check SB5

1 = Block-erase error

(see Note C)

NOTES: A. Full status-register check can be done after each block or after a sequence of blocks.

B. SB3 must be cleared before attempting additional program/erase operations.

C. SB5 is cleared only by the clear-status-register command in cases where multiple blocks are erased before full status is checked.

Figure 5. Automated Block-Erase Flow Chart

Start

Issue Erase-Setup Command

and Block Address

Issue Block-Erase-Confirm

Command and

Block Address

Read Status-Register Bits

SB7 = 1

Full Status-Register

Check (optional)

See Note A

Yes

Block-Erase Completed

FULL STATUS-REGISTER-CHECK FLOW

SB3 = 0

Yes

VPP Range Error

SB4 = 1,

SB5 = 1

Yes

Command Sequence

Error

Block-Erase Passed

Erase

Suspend

Yes

Erase-

Suspend

Loop

SB5 = 0

Block-Erase Failed

Yes

Read Status-Register

Bits

TMS28F008AXY Datasheet(PDF) 23 Page - Texas Instruments

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