TMS28F002AXY datasheet(7/79 Pages) TI

7 / 79 page

TMS28F002Axy, TMS28F200Axy

262144 BY 8-BIT/131072 BY 16-BIT

AUTO-SELECT BOOT-BLOCK FLASH MEMORIES

SMJS826D – JANUARY 1996 – REVISED SEPTEMBER 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

block memory maps (continued)

3FFFFh

3C000h

3BFFFh

3A000h

39FFFh

38000h

37FFFh

20000h

1FFFFh

00000h

Address

Range

Boot Block

16K Addresses

Parameter Block

8K Addresses

Parameter Block

8K Addresses

Main Block

96K Addresses

Main Block

128K Addresses

8-Bit Configuration

DQ15/A –1 Is LSB Address

1FFFFh

1E000h

1DFFFh

1D000h

1CFFFh

1C000h

1BFFFh

10000h

0FFFFh

00000h

Address

Range

Boot Block

8K Addresses

Parameter Block

4K Addresses

Parameter Block

4K Addresses

Main Block

48K Addresses

Main Block

64K Addresses

16-bit

Configuration

A0 Is LSB Address

NOTE A: The TMS28F002AxT is mapped the same way as the 8-bit configuration

of the TMS28F200AxT and the LSB is A0.

Figure 1. TMS28F200AxT ( Top Boot Block ) Memory Map (See Note A)

Boot Block

16K Addresses

Parameter Block

8K Addresses

Parameter Block

8K Addresses

Main Block

128K Addresses

Main Block

96K Addresses

3FFFFh

20000h

1FFFFh

08000h

07FFFh

06000h

05FFFh

04000h

03FFFh

00000h

Address

Range 8-Bit Configuration

DQ15/A –1 Is LSB Address

1FFFFh

10000h

0FFFFh

04000h

03FFFh

03000h

02FFFh

02000h

01FFFh

00000h

Address

Range

Main Block

64K Addresses

Main Block

48K Addresses

Parameter Block

4K Addresses

Parameter Block

4K Addresses

Boot Block

8K Addresses

16-Bit

Configuration

A0 Is LSB Address

NOTE A: The TMS28F002AxB is mapped the same way as the 8-bit

configuration of the TMS28F200AxB and the LSB is A0.

Figure 2. TMS28F200AxB (Bottom-Boot Block ) Memory Map (See Note A)

boot-block data protection

The 16K-byte boot block can be used to store key system data that is seldom changed in normal operation. Data

in this block can be secured by using different combinations of the reset / deep power-down pin (RP), the

write-protect pin (WP), and VPP supply levels. Table 2 shows a listing of these combinations.

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