SH7261 datasheet(239/1348 Pages) RENESAS

239 / 1348 page

Section 9 Bus State Controller (BSC)

Rev. 2.00 Sep. 07, 2007 Page 207 of 1312

REJ09B0320-0200

9.2

Input/Output Pins

Table 9.1 shows the pin configuration of the BSC.

Table 9.1

Pin Configuration

Name

I/O

Function

A27 to A0

Output

Address bus

D31 to D0

I/O

Data bus

CS6 to CS0

Output

Chip select

Output

Read pulse signal (read data output enable signal)

WR3

Output

When accessing the 32-bit bus area, indicates that D31 to D24 are

being written to in byte-write mode.

WR2

Output

When accessing the 32-bit bus area, indicates that D23 to D16 are

being written to in byte-write mode.

WR1

Output

When accessing the 32-bit bus area, indicates that D15 to D8 are

being written to in byte-write mode.

When accessing the 16-bit bus area, indicates that D15 to D8 are

being written to in byte-write mode.

WR0

Output

When accessing the 8-bit bus area, indicates that D7 to D0 are

being written to in byte-write mode.

BC3

Output

When accessing the 32-bit bus area, indicates that D31 to D24 are

being accessed in byte-access mode.

BC2

Output

When accessing the 32-bit bus area, indicates that D23 to D16 are

being written to in byte-write mode.

BC1

Output

When accessing the 32-bit bus area, indicates that D15 to D8 are

being accessed in byte-access mode.

When accessing the 16-bit bus area, indicates that D15 to D8 are

being accessed in byte-access mode.

BC0

Output

When accessing the 8-bit bus area, indicates that D7 to D0 are

being accessed in byte-access mode.

SDCS1, SDCS0 Output

Connects to

CS pin when SDRAM is connected.

SDRAS

Output

Connects to

RAS pin when SDRAM is connected.

SDCAS

Output

Connects to

CAS pin when SDRAM is connected.

SDWE

Output

Connects to

WE pin when SDRAM is connected.

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