TMPR4956C datasheet(229/286 Pages) TOSHIBA

229 / 286 page

Chapter 11 TX4956 System Interface

11-61

Table 11.3.6 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 11.3.7. The encoding

of SysCmd[3:0] for external data identifiers is illustrated in Table 11.3.8.

Table 11.3.7 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 11.3.8 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]

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 TX4956 processor.

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