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TMPR4955AF Datasheet(PDF) 102 Page - Toshiba Semiconductor

Part # TMPR4955AF
Description  64-Bit TX System RISC TX49 Family
PDF  168 Pages
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Manufacturer  TOSHIBA [Toshiba Semiconductor]
Direct Link  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TMPR4955AF Datasheet(HTML) 102 Page - Toshiba Semiconductor

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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
0
Final data element
1
Is not final data element
SysCmd(6)
Response Data Indication
0
Response data
1
Is not response data
SysCmd(5)
Good Data Indication
0
No errors
1
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
0
Final data element
1
Is not final data element
SysCmd(6)
Response Data Indication
0
Response data
1
Is not response data
SysCmd(5)
Good Data Indication
0
No errors
1
Is error data
SysCmd(4)
Enable Data Check
0
Check data bits and check bits
1
Do not check data bits and check bits
SysCmd(3)
Reserved



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