SH7713 Datasheet, PDF (375/904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 12 Bus State Controller (BSC)
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
O 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)
O Indicates that D7 to D0 are being written to.
Connected to the byte select signal when a byte-selection SRAM is
connected.
RAS
CAS
O Connects to RAS pin when SDRAM is connected.
O Connects to CAS pin when SDRAM is connected.
CKE
IOIS16
O Connects to CKE pin when SDRAM is connected.
I 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
O Connected to the DQMxx when the SDRAM is connected.
DQMUL
DQMUU: Selects D31 to D24
DQMLU
DQMUL: Selects D23 to D16
DQMLL
DQMLU: Selects D15 to D8
WAIT
BREQ
BACK
DQMLL: Selects D7 to D0
I External wait input
I Bus request input
O Bus acknowledge output
MD5 to MD3
I MD5: Selects data alignment (big endian or little endian)
REFOUT
MD4 and MD3: Specify area 0 bus width (8/16/32 bits)
O Refresh request output when a bus is released
Rev.1.50 Aug. 30, 2006 Page 335 of 860
REJ09B0288-0150