TMPR4955AF datasheet(131/168 Pages) TOSHIBA

131 / 168 page

Chapter 6 TX4955A System Interface

6-59

Table 6.3.6 Encoding of SysCmd (1:0) for Single Address Requests

SysCmd (1:0)

Data size.

One byte valid (byte)

Two bytes valid (halfword).

Three bytes valid (tribyte).

Four bytes valid (single word)

The encoding of SysCmd (3:0) for processor data identifiers is described in Table 6.3.7.

The encoding of SysCmd (3:0) for external data identifiers is illustrated in Table 6.3.8.

Table 6.3.7 Encoding of SysCmd(3:0) for Processor Data Identifiers

SysCmd (3)

Last Data Element Indication

Last data element

Not the last data element

SysCmd (2)

Reserved

SysCmd (1)

Reserved for: Good Data Indication

Processor drives 0

(Data is error free)

SysCmd (0)

Reserved for: Data Checking Enable

Processor drives 1

(Disable data checking)

Table 6.3.8 Encoding of SysCmd(3:0) for External Data Identifiers

SysCmd (3)

Last Data Element Indication

Last data element

Not the last data element

SysCmd (2)

Response Data Indication

Data is response data

Data is not response data

SysCmd (1)

Reserved for: Good Data Indication

Data is error free

Data is erroneous

SysCmd (0)

Reserved for: Data Checking Enable

Processor ignores this field (Suggested drive of 1,

disable data checking)

Note: External read requests for processor resources are not supported in the TX4955A processor.

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