TMPR4955AF datasheet(101/168 Pages) TOSHIBA

101 / 168 page

Chapter 6 TX4955A System Interface

6-29

6.2.11.5 Null requests

Figure 6.2.27 illustrates the SysCmd format in the case of read requests.

5 4

011

Null request specific

Figure 6.2.27 Bit Definition of the SysCmd Bus for Null Requests

Null request commands are always used for system interface release external null

requests. Table 6.2.14 indicates methods of specifying SysCmd(4:3) for system

interface release external null requests. SysCmd(2:0) is reserved for null requests.

Table 6.2.14 Method of Specifying SysCmd(4:3) for External Null Requests

SysCmd(4:3)

Null Properties

Release system interface

∼ 3

Reserved

6.2.11.6 Syntax of system interface data identifiers

This section defines methods of specifying the SysCmd bus for system interface

identifiers. The bit structure illustrated in Figure 6.2.28 is common to all system

interface data identifiers.

Final

Data

Response

Data

Error

Data

Check

Reserved

Figure 6.2.28 Bit Definition of the SysCmd Bus for Null Requests

SysCmd(8) must always be set to “1” for system interface data identifiers. System

interface data identifiers are in the non-coherent data format.

6.2.11.7 Non-coherent data

Non-coherent data are data such as the following.

•

Data that are the subject of a processor block write request or a processor

double word/partial double word/word/partial word write request.

•

Data that are returned to a processor non-coherent block read request or a

processor double word/

partial double word/word/partial word read request.

•

Data that are the subject of an external write request.

•

Data that are returned to an external read request as a response.

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