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| 型號： | TMPR4956F |
| 廠商： | Toshiba Corporation |
| 英文描述： | 64-bit RISC (Reduced Instruction Set Computer) microprocessor(64位精簡指令集系統(tǒng)計算機微處理器) |
| 中文描述： | 64位RISC（精簡指令集計算機）微處理器（64位精簡指令集系統(tǒng)計算機微處理器） |
| 文件頁數(shù)： | 41/60頁 |
| 文件大?。?/td> | 244K |
| 代理商： | TMPR4956F |
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TOSHIBA
TENTATIVE
TMPR4955/56
20-Oct.-1999
41
Category
1
2
3
Minimum cycle count
3
1
0
Maximum cycle count
5
24
0
Table 9-1 Release Latency for External Requests
5.10 System Interface Command and Data Identifiers
System interface commands specify the type of system interface and its properties. This specification is
performed in the request address cycle. The system interface data identifiers specify the properties of the
data transferred during the system interface data cycle.
Of the system interface commands and data identifiers used for external requests, set the bits and fields
that are reserved to “1.” In the case of system interface commands and data identifiers used for processor
requests, bits, field contents and data identifiers that are reserved in the commands are undefined.
5.10.1 Syntax of commands and data identifiers
System interface commands and data identifiers consist of 9 bits. These commands are sent by the
SysCmd bus from the processor to the external agent or from the external agent to the processor during
either the address cycle or the data cycle. Bit 8 (MSB) of the SysCmd bus specifies whether the SysCmd
contents at that time are a command or a data identifier (namely, whether the current cycle is an address
cycle or a data cycle). If the contents are a system interface command, then SysCmd(8) must be set to
“0.” If the contents are a system interface data identifier, then SysCmd(8) must be set to “1.”
5.10.2 Syntax of system interface commands
Following is an explanation of the SysCmd bus structure in the case of a system interface command.
Figure 10-1 illustrates the structure common to all system interface commands.
0
Request type
Request specific
Figure 10-1 Syntax Bit Structure of System Interface Command
SysCmd(8) must always be set to “0” in the case of system interface commands.
SysCmd(7:5) specifies the type of system interface request (read, write, null). Table 10-1 indicates the
SysCmd(7:5) specification method.
8
7
5
4
0
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