TMP92FD54AI datasheet(39/84 Pages) TOSHIBA

39 / 84 page

2006-01-27

92FD54AI-39

TMP92FD54AI

to part 7), entitled

The password, on page 50 of subsection 4.3.2 (6), Boot

program. If the received data does not correspond to any operation command,

the device returns the ACK response data for an Operation Command error

(bit 0) X1H and waits for the next operation command (third byte). The four

high-order bits of the returned ACK response data are undefined. (They are

the four high-order bits of the immediately preceding operation command

data.)

5. The data received in bytes 5 to 16 is password data (12 bytes). The data in

bytes 5 to 16 is compared with the data in flash memory address 08FEF4H to

08FEFFH respectively. If the password does not match, the device sets the

Password Error flag.

6. The data received as the 17th byte is checksum data. For details of how to

calculate CHECKSUM data, please refer to part 9), entitled

Calculating

CHECKSUM, on page 51 of subsection 4.3.2 (6), Boot program. The checksum

sent by the controller should be equal to the 2’s complement of the unsigned

8-bit value obtained by summing the value of bytes 5 to 16, ignoring any

overflow.

7. The data in the 18th byte is the ACK response data returned by the device for

the data received as bytes 5 to 17 (the ACK response for the CHECKSUM

value). The device first checks to see whether the data received as bytes 5 to

17 contains any Receive errors. If a Receive error is found, the device returns

the ACK response data for a Communications error (bit 3) 18H and waits for

the next operation command (third byte). The four high-order bits of the

returned ACK response data are the four high-order bits of the immediately

preceding operation command data, so the value of these bits is always 1.

Next, the device checks the CHECKSUM data in the 17th byte. This check is

made to see if the low-order 8-bit value obtained by adding eight bits of the

transmission data to bytes 5 to17 not including the sign (ignoring overflow) is

00H. If the value is not 00H, the device returns the ACK response data for a

CHECKSUM error (bit 0) 11H and waits for the next operation command

(third byte).

Finally, the device examines the result of the password matching check. In the

following cases the device returns ACK response data for a Password error (bit

0) 11H and waits for the next operation command (third byte).

•

Irrespective of the result of the password matching check for bytes 5 to 17,

all 12 bytes of data in the password area will have the same value (a value

other than FFH).

•

None of the password data in bytes 5 to 17 matches the corresponding

flash memory data.

If all data is found to be normal as a result of the above check, the device

returns the ACK response data for normal reception, 10H.

8. The data received as bytes 19 to 22 indicates the start address in RAM in

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