參數(shù)資料
型號: TMPR4955
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): 43/60頁
文件大?。?/td> 244K
代理商: TMPR4955
TOSHIBA
TENTATIVE
TMPR4955/56
20-Oct.-1999
43
SysCmd(2:0)
0
1
2
3
4
5
6
7
Read Data Size
1 byte valid (byte)
2 bytes valid (half-word)
3 bytes valid (tri-byte)
4 bytes valid (word)
5 bytes valid (quinti-byte)
6 bytes valid (sexi-byte)
7 bytes valid (septi-byte)
8 bytes valid (double word)
Note: 4 – 7 of SysCmd(2:0) is only valid when in the 64-bit bus mode.
Table 10-4 Data Size Expressed by SysCmd(2:0) for Double Word, Word, or Partial Word Read
Requests
5.10.4 Write requests
Figure 10-3 illustrates the SysCmd format for write requests.
Table 10-5 indicates the methods of specifying write properties using SysCmd(4:3). Table 10-6 indicates
the methods of specifying replacements properties using SysCmd(2:0) for block write requests. Table 10-
7 indicates the methods of specifying the data size using SysCmd(2:0) for write requests.
0
1
0 1 0
Figure 10-3 SysCmd Bus Bit Specification for Write Requests
SysCmd(4:3)
0 – 1
2
3
Write Properties
Reserved
Block write
64-bit
Double word, partial double word, word, or
partial word write
32-bit
Word or partial word write
mode
mode
Table 10-5 Methods of Specifying SysCmd(4:3) for Write Requests
SysCmd(2)
SysCmd(1:0)
0
1
2 – 3
Reserved
Read Block Size
Reserved
8 words
Reserved
Table 10-6 Specification Method of SysCmd(2:0) for Block Write Requests
8
7
5
4
0
Write request specific
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