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TMP92FD54AI 数据表(PDF) 26 Page - Toshiba Semiconductor |
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TMP92FD54AI 数据表(HTML) 26 Page - Toshiba Semiconductor |
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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) 0 → 1 RESET New user application program (a) Rewrite routine Flash memory RAM Old user application program (or erased) Boot ROM SIO1 |
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