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TMPR4955AF датащи(PDF) 131 Page - Toshiba Semiconductor

номер детали TMPR4955AF
подробное описание детали  64-Bit TX System RISC TX49 Family
PDF  168 Pages
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производитель  TOSHIBA [Toshiba Semiconductor]
домашняя страница  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TMPR4955AF датащи(HTML) 131 Page - Toshiba Semiconductor

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Chapter 6 TX4955A System Interface
6-59
Table 6.3.6 Encoding of SysCmd (1:0) for Single Address Requests
SysCmd (1:0)
Data size.
0
One byte valid (byte)
1
Two bytes valid (halfword).
2
Three bytes valid (tribyte).
3
Four bytes valid (single word)
The encoding of SysCmd (3:0) for processor data identifiers is described in Table 6.3.7.
The encoding of SysCmd (3:0) for external data identifiers is illustrated in Table 6.3.8.
Table 6.3.7 Encoding of SysCmd(3:0) for Processor Data Identifiers
SysCmd (3)
Last Data Element Indication
0
Last data element
1
Not the last data element
SysCmd (2)
Reserved
SysCmd (1)
Reserved for: Good Data Indication
Processor drives 0
(Data is error free)
SysCmd (0)
Reserved for: Data Checking Enable
Processor drives 1
(Disable data checking)
Table 6.3.8 Encoding of SysCmd(3:0) for External Data Identifiers
SysCmd (3)
Last Data Element Indication
0
Last data element
1
Not the last data element
SysCmd (2)
Response Data Indication
0
Data is response data
1
Data is not response data
SysCmd (1)
Reserved for: Good Data Indication
0
Data is error free
1
Data is erroneous
SysCmd (0)
Reserved for: Data Checking Enable
Processor ignores this field (Suggested drive of 1,
disable data checking)
Note: External read requests for processor resources are not supported in the TX4955A processor.



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