SH7261 datasheet(257/1348 Pages) RENESAS

257 / 1348 page

Section 9 Bus State Controller (BSC)

Rev. 2.00 Sep. 07, 2007 Page 225 of 1312

REJ09B0320-0200

Bit

Bit Name

Initial

Value

R/W

Description

6 to 4

CSWOFF

[2:0]

000

R/W

Write Operation CS Delay Cycle Select

These bits specify the number of cycles from the end of

the wait cycle during write access operation (negation

of the

WR3 to WR0 signals) and the negation of the

CS6 to CS0 signal.

000: 0 wait state

111: 7 wait states



Reserved

This bit is always read as 0. The write value should

always be 0.

2 to 0

CSROFF

[2:0]

111

R/W

Read Operation CS Delay Cycle Select

These bits specify the number of cycles from the end of

the wait cycle during read access operation (negation

of the

RD signal) and the negation of the CS6 to CS0

signal.

000: 0 wait state

111: 7 wait states

Notes: 1. Select each wait cycle number or extended cycle number according the system

configuration incorporated.

2. Writing to the CSn wait control register 2 (CS2WCNTn) must be done while CSC for the

corresponding channel is disabled (EXENB

= 0). Only channel 0 (CS0) can be enabled

by setting EXENB = 1. To enable channel 0, stop the DMAC and set EXENB to 1

between the reset release and data write access to CS0.

3. Each bit must be set under the following restrictions.

•

When page access is disabled (PRENB, PWENB

= 0)

CSON

≤ min (CSRWAIT, CSWWAIT), WDON ≤ CSWWAIT

WRON

≤ CSWWAIT, RDON ≤ CSRWAIT

WDOFF

≤ CSWOFF

•

When page access is enabled (PRENB

= 1 or PWENB = 1)

In addition to the restrictions for disabled page access case, the following

restrictions are required.

CSON

≤ min (CSPRWAIT, CSPWWAIT)

WRON

≤ CSPWWAIT, RDON ≤ CSPRWAIT

WDON

≤ CSPWWAIT

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