TMPR4955AF datasheet(133/168 Pages) TOSHIBA

部品番号	TMPR4955AF

部品情報	64-Bit TX System RISC TX49 Family

PDF	168 Pages

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メーカー	TOSHIBA [Toshiba Semiconductor]

ホームページ	http://www.semicon.toshiba.co.jp/eng

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133 / 168 page

Chapter 6 TX4955A System Interface

6-61

6.3.21

Read Time Out Counter (MODE43* = 0)

This counter is used to detect time-out when data is not returned during read.

The counter normally is set by loading the G2SConfig register’s TOutVal as its

initial value. When one of the conditions below is met, the counter counts down

one every bus cycle and upon reaching the terminal count of 0, generates a time-out

signal and asserts a bus error signal for one cycle before entering an idle state. If none of

the following conditions is met, the value of TOutVal is reloaded into the counter.

• TOutEnable = 1

• Waiting for data

Note1: For TX4955A, Read Time Out Counter does not work when MODE43* = 1.

When the Read Time Out Counter functions is used, the value of the more than which

added 24 the twice of the wait cycle of the main memory must be set to the TOutVal field.

Note2: Read Time Out Error occurs by writing 0x0 into TOutVal while Read Time Out Counter is

disable.

So TOutVal must be set except for 0x0.

TMPR4955AF データシート(PDF) 133 Page - Toshiba Semiconductor