TMP92FD54AI datasheet(50/84 Pages) TOSHIBA

50 / 84 page

2006-01-27

92FD54AI-50

TMP92FD54AI

7) The password

If the received operation command data is a RAM Transfer command (10H), the boot

program checks the password. First, after echoing back the received operation

command data (10H), the boot program checks the data (12 bytes) in the password area

(addresses 08FEF4H to 08FEFFH).

Next, the boot program checks the received data in bytes 5 to 16 (the password data)

against the corresponding data in the flash memory. The relationship between the

received data and the flash memory data which is compared with it is shown in Table

4.3.5. Unless all of 12 bytes of the data match, a Password error is assumed to have

occurred. In this case, the ACK response returned for the CHECKSUM value in the

17th byte will signify a Password error.

Table 4.3.12 Relationship between data received and data in flash memory

with which it is compared

Received Data

Flash Memory Data for Comparison

5th byte

Data at address 08FEF4H

6th byte

Data at address 08FEF5H

7th byte

Data at address 08FEF6H

8th byte

Data at address 08FEF7H

9th byte

Data at address 08FEF8H

10th byte

Data at address 08FEF9H

11th byte

Data at address 08FEFAH

12th byte

Data at address 08FEFBH

13th byte

Data at address 08FEFCH

14th byte

Data at address 08FEFDH

15th byte

Data at address 08FEFEH

16th byte

Data at address 08FEFFH

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