SH7713 datasheet(375/904 Pages) RENESAS

375 / 904 page

Section 12 Bus State Controller (BSC)

Rev.1.50 Aug. 30, 2006 Page 335 of 860

REJ09B0288-0150

Name

I/O

Function

WE3(BE3)/ICIOWR O

Indicates that D31 to D24 are being written to.

Connected to the byte select signal when a byte-selection SRAM is

connected.

Functions as the I/O write strobe signal when the PCMCIA is used.

WE2(BE2)/ICIORD O

Indicates that D23 to D16 are being written to.

Connected to the byte select signal when a byte-selection SRAM is

connected.

Functions as the I/O read strobe signal when the PCMCIA is used.

WE1(BE1)/WE

Indicates that D15 to D8 are being written to.

Connected to the byte select signal when a byte-selection SRAM is

connected.

Functions as the memory write strobe signal when the PCMCIA is

used.

WE0(BE0)

Indicates that D7 to D0 are being written to.

Connected to the byte select signal when a byte-selection SRAM is

connected.

RAS

Connects to

RAS pin when SDRAM is connected.

CAS

Connects to

CAS pin when SDRAM is connected.

CKE

Connects to CKE pin when SDRAM is connected.

IOIS16

PCMCIA 16-bit I/O signal

Valid only in little endian mode.

Make it into low level at the time of big endian mode.

DQMUU

DQMUL

DQMLU

DQMLL

Connected to the DQMxx when the SDRAM is connected.

DQMUU: Selects D31 to D24

DQMUL: Selects D23 to D16

DQMLU: Selects D15 to D8

DQMLL: Selects D7 to D0

WAIT

External wait input

BREQ

Bus request input

BACK

Bus acknowledge output

MD5 to MD3

MD5: Selects data alignment (big endian or little endian)

MD4 and MD3: Specify area 0 bus width (8/16/32 bits)

REFOUT

Refresh request output when a bus is released

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