參數(shù)資料
型號(hào)： TMPR4956F
廠商： Toshiba Corporation
英文描述： 64-bit RISC (Reduced Instruction Set Computer) microprocessor(64位精簡(jiǎn)指令集系統(tǒng)計(jì)算機(jī)微處理器)
中文描述： 64位RISC（精簡(jiǎn)指令集計(jì)算機(jī)）微處理器（64位精簡(jiǎn)指令集系統(tǒng)計(jì)算機(jī)微處理器）
文件頁(yè)數(shù)： 46/60頁(yè)
文件大?。?/td> 244K
代理商： TMPR4956F
TOSHIBA
TENTATIVE
TMPR4955/56
20-Oct.-1999
46
5.10.8 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 10-9 indicates methods of specifying SysCmd(7:3) for processor data identifiers. Table 10-10
indicates methods of specifying SysCmd(7:3) for external data identifiers.
SysCmd(7)
0
1
SysCmd(6)
0
1
SysCmd(5)
0
1
SysCmd(4:3)
Final Data Element Indication
Final data element
Is not final data element
Response Data Indication
Response data
Is not response data
Good Data Indication
No errors
Is error data
Reserved
Table 10-9 Methods of Specifying SysCmd(7:3) for Processor Data Identifiers
SysCmd(7)
0
1
SysCmd(6)
0
1
SysCmd(5)
0
1
SysCmd(4)
0
1
SysCmd(3)
Final Data Element Indication
Final data element
Is not final data element
Response Data Indication
Response data
Is not response data
Good Data Indication
No errors
Is error data
Enable Data Check
Check data bits and check bits
Do not check data bits and check bits
Reserved
Table 10-10 Method of Specifying SysCmd(7:3) for External Data Identifiers
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