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TMPR4955AF датащи(PDF) 99 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) 99 Page - Toshiba Semiconductor

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Chapter 6 TX4955A System Interface
6-27
6.2.11.3 Read requests
Figure 6.2.25 illustrates the SysCmd format in the case of read requests.
87
5 4
0
0
000
Read request specific
Figure 6.2.25 Bit Definition of SysCmd Bus for Read Requests
Table 6.2.8, 6.2.9, and 6.2.10 indicate the methods for specifying SysCmd(4:0) for
read requests.
Table 6.2.8 Specification Method of SysCmd(4:3) for Read Requests
SysCmd(4:3)
Read Properties
0
∼ 1
Reserved
2
Non-coherent block read
3
Word or partial word read
Table 6.2.9 Specification Method of SysCmd(2:0) for Block Read Requests
SysCmd(2)
Reserved
SysCmd(1:0)
Read Block Size
0
Reserved
18 words
2
∼ 3
Reserved
Table 6.2.10 Data Size Expressed by SysCmd(2:0) for Double Word, Partial Double Word, Word or
Partial Word Read Requests
SysCmd(2:0)
Read Data Size
0
1 byte valid (byte)
1
2 bytes valid (half-word)
2
3 bytes valid (tri-byte)
3
4 bytes valid (word)
4
5 bytes valid (quinti-byte)
5
6 bytes valid (sexi-byte)
6
7 bytes valid (septi-byte)
7
8 bytes valid (double word)
Note: 6.10.4 of SysCmd(2:0) is only valid when in the 64-bit bus mode.



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