103
8.1.3
Pin Configuration
Table 8.1 shows the BSC pin configuration.
Table 8.1
Pin Configuration
Name
Abbreviation
I/O
Function
Chip select 7–0
CS7
–
CS0
O
Chip select signal that indicates the area being
accessed
Read
RD
O
Strobe signal that indicates the read cycle
High write
WRH
O
Strobe signal that indicates write cycle to upper 8
bits
Low write
WRL
O
Strobe signal that indicates write cycle to lower 8
bits
Write
WR
*
1
O
Strobe signal that indicates write cycle
High byte strobe
HBS
*
2
O
Strobe signal that indicates access to upper 8 bits
Low byte strobe
LBS
*
3
O
Strobe signal that indicates access to lower 8 bits
Row address strobe
RAS
O
DRAM row address strobe signal
High column
address strobe
CASH
O
Column address strobe signal for accessing the
upper 8 bits of the DRAM
Low column
address strobe
CASL
O
Column address strobe signal for accessing the
lower 8 bits of the DRAM
Address hold
AH
O
Signal for holding the address for address/data
multiplexing
Wait
WAIT
I
Wait state request signal
Address bus
A21–A0
O
Address output
Data bus
AD15–AD0
I/O
Data I/O. During address/data multiplexing,
address output and data input/output
Data bus parity high
DPH
I/O
Parity data I/O for upper byte
Data bus parity low
DPL
I/O
Parity data I/O for lower byte
Notes:
*
1 Doubles with the
WRL
pin. (Selected by the BAS bit in BCR. See section 8.2.1, Bus
Control Register (BCR), for details.)
*
2 Doubles with the A0 pin. (Selected by the BAS bit in BCR. See section 8.2.1, Bus
Control Register (BCR), for details.)
*
3 Doubles with the
WRH
pin. (Selected by the BAS bit in BCR. See section 8.2.1, Bus
Control Register (BCR), for details.)
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