TMPR4955AF datasheet(114/168 Pages) TOSHIBA

114 / 168 page

Chapter 6 TX4955A System Interface

6-42

EOK

EOK*

(I)

Indicates an external agent accepts a processor request. An external agent has

excepted the processor read/write command if and only if the following has

occurred:

AEOK

EOK

EOK* is active.

The processor asserts PValid

PValid

PValid* and drives a read or write command. EOK

EOK

EOK* is asserted

and the external agent accepts the processor command.

Once the external agent has accepted a processor write command, the agent must be able

to accept the entire data size at the programmed data rate immediately following this

command.

The external agent may provide read response data to the processor at any rate.

Deasserting EOK may kill a processor read/write request in progress. If this occurs, the

external agent must ignore command and data from the processor in the following cycle.

Pro Cmd (Rd/Wr)

Proc Address

SysAD

SCycle

SClock

SysCmd

EOK*

PValid*

Figure 6.3.8 Sample Cycle with EOK* Asserted

Proc Address

Pro Cmd (Wr)

Proc Data

Data Cmd

SysAD

SCycle

SClock

SysCmd

EOK*

PValid*

Figure 6.3.9 Sample Cycle with EOK* Asserted, Then Deasserted

AEOK

EOK

EOK* is active.

Processor asserts PValid

PValid

PValid* and drives a read or write command. EOK

EOK

EOK* is deasserted

(external agent has killed the processor’s command).

The external agent must ignore any SysAD and SysCmd data from the processor.

D The external agent

does not ignore any SysAD and SysCmd data from the processor.

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