TMPR4955AF datasheet(102/168 Pages) TOSHIBA

102 / 168 page

Chapter 6 TX4955A System Interface

6-30

6.2.11.8 Bit definition of data identifiers

In the case of processor or external coherent data identifiers and processor or

external non-coherent data identifiers, SysCmd(7) indicates that they are the final

data element, and SysCmd(6) indicates whether they are response data. Response

data are the data that are returned to a read request as a response.

SysCmd(5) indicates whether there is an error in a data element. Uncorrectable

errors are included in the error data. When such an error is returned to the processor,

a bus error is generated. If a primary parity error is detected in the data items to be

transferred, the processor deasserts the good data bits and sends data.

SysCmd(4) indicates to the processor whether the data bits and check bits of a data

element should be searched.

SysCmd(3) is reserved in the case of external data identifiers.

SysCmd(4:3) is reserved in the case of non-coherent processor data identifiers.

SysCmd(2:0) is reserved in the case of non-coherent data identifiers.

Table 6.2.15 indicates methods of specifying SysCmd(7:3) for processor data

identifiers. Table 6.2.16 indicates methods of specifying SysCmd(7:3) for external

data identifiers.

Table 6.2.15 Methods of Specifying SysCmd(7:3) for Processor Data Identifiers

SysCmd(7)

Final Data Element Indication

Final data element

Is not final data element

SysCmd(6)

Response Data Indication

Response data

Is not response data

SysCmd(5)

Good Data Indication

No errors

Is error data

SysCmd(4:3)

Reserved

Table 6.2.16 Method of Specifying SysCmd(7:3) for External Data Identifiers

SysCmd(7)

Final Data Element Indication

Final data element

Is not final data element

SysCmd(6)

Response Data Indication

Response data

Is not response data

SysCmd(5)

Good Data Indication

No errors

Is error data

SysCmd(4)

Enable Data Check

Check data bits and check bits

Do not check data bits and check bits

SysCmd(3)

Reserved

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