TMPR4956C datasheet(199/286 Pages) TOSHIBA

199 / 286 page

Chapter 11 TX4956 System Interface

11-31

11.2.11.8 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 11.2.5 indicates methods of specifying SysCmd[7:3] for processor data identifiers.

Table 11.2.16 indicates methods of specifying SysCmd[7:3] for external data identifiers.

Table 11.2.15 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 11.2.16 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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