TMP92FD54AI datasheet(26/84 Pages) TOSHIBA

26 / 84 page

2006-01-27

92FD54AI-26

TMP92FD54AI

Single Boot Mode

(2-A) Using the rewrite algorithm in the internal boot ROM

(Step 1)

The state of the flash memory is not important; it may contain the old version of the

user program or it may have been erased. Since the rewriting routine and rewrite data

are transferred via SIO (SIO1), the device’s SIO (SIO1) and the external controller should

be connected on the board. The user must ensure that (a), the rewrite routine, is present

on the controller.

(Step 2)

To turn the boot ROM on, Reset must be de-asserted by setting the input pins

accordingly. (a), the rewriting routine, must be transferred from the source (the

controller) into the device via SIO. Before this is carried out, however, the password

entered by the user must be checked against the password registered on the user

application program. (When the flash memory has been erased, erase data

(“0xFF”12byte ) is used as the password.)

(TMP92FD54AI)

Flash memory

RAM

Contains old user

application program

(or has been erased).

(Controller)

New user

application program

(I/O)

(a) Rewrite routine

Boot ROM

SIO1

(TMP92FD54AI)

(Controller)

(I/O)

→ 1 RESET

New user

application program

(a) Rewrite routine

Flash memory

RAM

Old user application

program (or erased)

Boot ROM

SIO1

TMP92FD54AI Datasheet(PDF) 26 Page - Toshiba Semiconductor

TMP92FD54AI Datasheet(HTML) 26 Page - Toshiba Semiconductor

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