TMS28F008AXY datasheet(16/52 Pages) TI

16 / 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

byte-wide or word-wide mode selection

The memory array is divided into two parts: an upper-half that outputs data through I/O pins DQ8–DQ15, and

a lower-half that outputs data through DQ0–DQ7. Device operation in either byte-wide or word-wide mode is

user-selectable and is determined by the logic state of BYTE. When BYTE is at a logic-high level, the device

is in the word-wide mode and data is written to, or read from, I/O pins DQ0–DQ15. When BYTE is at a logic-low

level, the device is in the byte-wide mode and data is written to or read from I/O pins DQ0–DQ7. In the byte-wide

mode, I/O pins DQ8–DQ14 are placed in the high-impedance state and DQ15/A–1 becomes the low-order

address pin and selects either the upper- or lower-half of the array. Array data from the upper half (DQ8–DQ15)

and the lower half (DQ0–DQ7) are multiplexed to appear on DQ0–DQ7. Table 6 and Table 7 summarize

operations for word-wide mode and byte-wide mode, respectively. Table 8 summarizes the operation for

’28F008Axy.

Table 6. Operation Modes for Word-Wide Mode (BYTE = VIH) (’28F800Axy) (see Note 2)

MODE

VPP

DQ0–DQ15

Read

VIL

VIH

Data out

VIL

VIH

VID

VIL

Manufacturer-equivalent code

0089h

Algorithm-selection mode

VIL

VIH

VID

VIH

Device-equivalent code 889Ch

(top boot block)

VIL

VIH

VID

VIH

Device-equivalent code 889Dh

(bottom boot block)

Output disable

VIL

VIH

Hi-Z

Standby

VIH

Hi-Z

Reset/deep power down

VIL

Hi-Z

Write (see Note 3)

VIL or

VIH

VIL

VIH

VIH or

VHH

VIL

VPPLor

VPPH

Data in

Table 7. Operation Modes for Byte-Wide Mode (BYTE = VIL) (’28F800Axy) (see Note 2)

MODE

VPP

DQ15/A–1

DQ8–DQ14

DQ0–DQ7

Read lower byte

VIL

VIH

VIL

Hi-Z

Data out

Read upper byte

VIL

VIH

Hi-Z

Data out

VIL

VIH

VID

VIL

Hi-Z

Manufacturer-equivalent

code 89h

Algorithm-selection

Device-equivalent code

mode

VIL

VIH

VID

VIH

Hi Z

9Ch (top boot block)

VIL

VIH

VID

VIH

Hi-Z

Device-equivalent code

9Dh (bottom boot block)

Output disable

VIL

VIH

Hi-Z

Standby

VIH

Hi-Z

Reset/deep power

down

VIL

Hi-Z

Write (see Note 3)

VIL

VIH

VIL

VIH

VHH

VIL

VPPL

VPPH

Hi-Z

Data in

NOTES:

2. X = don’t care

3. When writing commands to the ’28F008Axy and the ’28F800Axy, VPP must be in the appropriate VPP voltage range (as shown in

the recommended operating conditions table for a specific product) for block-erase or program commands to be executed. Also,

depending on the combination of RP and WP, the boot block can be secured and, therefore, is not programmable (see Table 2 for

a list of the combinations).

TMS28F008AXY Datasheet(PDF) 16 Page - Texas Instruments

TMS28F008AXY Datasheet(HTML) 16 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Datasheet Download

Link URL