HD6432351 datasheet(179/1025 Pages) RENESAS

179 / 1025 page

Section 6 Bus Controller

Rev. 3.00 Sep 15, 2006 page 145 of 988

REJ09B0330-0300

6.3.4

Advanced Mode

The initial state of each area is basic bus interface, 3-state access space. The initial bus width is

selected according to the operating mode. The bus specifications described here cover basic items

only, and the sections on each memory interface (6.4, 6.5, and 6.7) should be referred to for

further details.

Area 0

Area 0 includes on-chip ROM*, and in ROM-disabled expansion mode, all of area 0 is external

space. In ROM-enabled expansion mode, the space excluding on-chip ROM* is external space.

When area 0 external space is accessed, the

CS0 signal can be output.

Either basic bus interface or burst ROM interface can be selected for area 0.

Note: * Only applies to the H8S/2351.

Areas 1 and 6

In external expansion mode, all of areas 1 and 6 is external space.

When area 1 and 6 external space is accessed, the

CS1 and CS6 pin signals respectively can be

output.

Only the basic bus interface can be used for areas 1 and 6.

Areas 2 to 5

In external expansion mode, all of areas 2 to 5 is external space.

When area 2 to 5 external space is accessed, signals

CS2 to CS5 can be output.

Basic bus interface or DRAM interface can be selected for areas 2 to 5. With the DRAM interface,

signals

CS2 to CS5 are used as RAS signals.

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