TMP92FD54AI datasheet(40/84 Pages) TOSHIBA

40 / 84 page

2006-01-27

92FD54AI-40

TMP92FD54AI

which the block-transferred data is to be stored. The 19th byte corresponds to

address bits 31 to 24 and the 22nd byte corresponds to address bits 7 to 0.

9. The data received as bytes 23 to 24 as bytes 19 to 22 the number of

block-transferred bytes. The 23rd byte corresponds to bits 15 to 8 and the 24th

byte to bits 7 to 0 of the transfer byte count.

10. The data received as the 25th byte is checksum data. The checksum data sent

by the controller should be equal to the 2’s complement of the unsigned 8-bit

value obtained by summing the values of bytes 19 to 24 ignoring any overflow.

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.

11. The data in the 26th byte is the ACK response data returned by the device for

the data received as bytes 19 to 25 (the ACK response for CHECKSUM value).

The device first checks to see whether the data received as bytes 19 to 25

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 25th 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 19 to 25 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).

•

Write your program so that the data in bytes 19 to 25 are stored within a

RAM address area from 000400H to 006BFFH.

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

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

12. The data received as bytes 27 to m is the data which is to be stored in RAM.

This data is written to RAM starting at the start address specified by the data

received as bytes 19 to 22 and up until the number of bytes specified by the

data received as bytes 23 to 24 in the 23rd to the 24th bytes has been reached.

13. The data received as the m + 1’th byte is checksum data. The checksum sent

by the controller should be equal to the 2’s complement of the unsigned 8-bit

value obtained by summing the values of bytes 27 to m, ignoring any overflow.

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.

14. The data in the m + 2’th byte is the ACK response data returned by the device

for the data received as bytes 27 to m + 1 (the ACK response for the

CHECKSUM value). The device first checks to see whether the data received

as bytes 27 to m + 1 contains any Receive error. If a receive error is found, the

TMP92FD54AI 数据表(PDF) 40 Page - Toshiba Semiconductor

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