參數(shù)資料
型號(hào)： TMPR4955
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)： 42/60頁(yè)
文件大小： 244K
代理商： TMPR4955
TOSHIBA
TENTATIVE
TMPR4955/56
20-Oct.-1999
42
SysCmd(7:5)
0
1
2
3
4 – 7
Command
Read request
Reserve
Write request
Null request
Reserve
Table 10-1 SysCmd(7:5) Specification Method for System Interface Commands
SysCmd(4:0) varies depending on the type of request. Each specification type is indicated below.
5.10.3 Read requests
Figure 10-2 illustrates the SysCmd format in the case of read requests.
0
0 0 0
Figure 10-2 Bit Definition of SysCmd Bus for Read Requests
Tables 10-2, 10-3, and 10-4 indicate the methods for specifying SysCmd(4:0) for read requests.
SysCmd(4:3)
0 – 1
2
3
Read Properties
Reserved
Non-coherent block read
64-bit
Double word, partial double word, word, or
partial word read
32-bit
Word or partial word read
mode
mode
Table 10-2 Specification Method of SysCmd(4:3) for Read Requests
SysCmd(2)
SysCmd(1:0)
0
1
2 – 3
Reserved
Read Block Size
Reserved
8 words (64-bit or 32-bit bus mode)
Reserved
Table 10-3 Specification Method of SysCmd(2:0) for Block Read Requests
8
7
5
4
0
Read request specific
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