SH7721 datasheet(346/1524 Pages) RENESAS

346 / 1524 page

Section 9

Bus State Controller (BSC)

Rev. 3.00 Jan. 18, 2008 Page 284 of 1458

REJ09B0033-0300

Name

I/O

Function

WE3(BE3)/DQMUU/

ICIOWR

Indicates that D31 to D24 are being written to.

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

is connected.

Corresponds to signals D31 to D24 when SDRAM is connected.

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

used.

WE2(BE2)/DQMUL/

ICIORD

Indicates that D23 to D16 are being written to.

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

is connected.

Corresponds to signals D23 to D16 when the SDRAM is used.

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

WE1(BE1)/DQMLU/

Indicates that D15 to D8 are being written to.

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

is connected.

Corresponds to signals D15 to D8 when the SDRAM is used.

Functions as the memory write strobe signal when the PCMCIA is

used.

WE0(BE0)/DQMLL

Indicates that D7 to D0 are being written to.

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

is connected.

Corresponds to select signals D7 to D0 when the SDRAM is used.

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.

Pulled low in bit endian mode.

WAIT

External wait input (sampled at the falling edge of CKIO)

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

Bus mastership request signal for refreshing

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