Toshiba TX39 user manual Read Operation, Single Read

TMPR3901F

4.2 Read Operation

The TMPR3901F supports two kinds of read operations single read and burst read .

4.2.1Single Read

The single read operation reads four bytes or less data. It is used in the following cases.

∙On a data cache miss (the data cache is not set for burst read)

∙An instruction fetch or data load from an uncached area

∙An instruction fetch when the instruction cache is disabled

∙A data load when the data cache is disabled

Figure 4-1 shows a timing chart for a single read operation with two wait cycles.

SYSCLK

A[31:2]

BE[3:0]*

RD*

BSTART*

LAST*

ACK*

BUSERR*

D[31:0]

Figure 4-1 Single-read operation (two wait cycles)

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