Renesas Stereo System SH7709S 用户手册
Rev. 5.00, 09/03, page 226 of 760
10.1.3
Pin Configuration
Table 10.1 shows the BSC pin configuration.
Table 10.1
BSC Pins
Pin Name
Signal
I/O
Description
Address bus
A25–A0
O
Address output
Data bus
D15–D0
I/O
Data I/O
D31–D16
I/O
Data I/O when using 32-bit bus width
Bus cycle start
BS
O
Shows start of bus cycle. During burst transfers,
asserted every data cycle.
asserted every data cycle.
Chip select 0, 2–4
CS0
,
CS2
–
CS4
O
Chip select signals to indicate area being accessed.
Chip select 5, 6
CS5
/
CE1A
,
CS6
/
CE1B
O
Chip select signals to indicate area being accessed.
CS5
/
CE1A
and
CS6
/
CE1B
can also be used as
CE1A
and
CE1B
of PCMCIA.
PCMCIA card
select
select
CE2A
,
CE2B
O
CE2A
and
CE2B
signals when PCMCIA is used
Read/write
RD/
WR
O
Data bus direction indication signal. PCMCIA write
indication signal.
indication signal.
Row address
strobe 3L
strobe 3L
RAS3L
O
When synchronous DRAM is used,
RAS3L
for lower
32-Mbyte address and 64-Mbyte address.
Row address
strobe 3U
strobe 3U
RAS3U
O
When synchronous DRAM is used,
RAS3U
for
upper 32-Mbyte address.
Column address
strobe
strobe
CASL
O
When synchronous DRAM is used,
CASL
signal for
lower 32-Mbyte address and 64-Mbyte address.
Column address
strobe LH
strobe LH
CASU
O
When synchronous DRAM is used,
CASU
signal for
upper 32-Mbyte address.
Data enable 0
WE0
/DQMLL
O
When memory other than synchronous DRAM is
used, D7–D0 write strobe signal. When
synchronous DRAM is used, selects D7–D0.
used, D7–D0 write strobe signal. When
synchronous DRAM is used, selects D7–D0.
Data enable 1
WE1
/DQMLU/
WE
O
When memory other than synchronous DRAM and
PCMCIA is used, D15–D8 write strobe signal. When
synchronous DRAM is used, selects D15–D8. When
PCMCIA is used, strobe signal indicating write
cycle.
PCMCIA is used, D15–D8 write strobe signal. When
synchronous DRAM is used, selects D15–D8. When
PCMCIA is used, strobe signal indicating write
cycle.
Data enable 2
WE2
/DQMUL/
ICIORD
O
When memory other than synchronous DRAM and
PCMCIA is used, D23–D16 write strobe signal.
When synchronous DRAM is used, selects D23–
D16. When PCMCIA is used, strobe signal
indicating I/O read.
PCMCIA is used, D23–D16 write strobe signal.
When synchronous DRAM is used, selects D23–
D16. When PCMCIA is used, strobe signal
indicating I/O read.