SH7708 Datasheet, PDF (584/625 Pages) Renesas Technology Corp – SuperH™ RISC engine

Table A.7 Pin States (DRAM/Little-Endian)
16-Bit Bus Width (Area 3)
16-Bit Bus Width (Area 2)
Pin
CS6 to CS0
RD
Byte Access Byte Access Word/
Byte Access Byte Access Word/
(Address 2n)(Address Longword (Address 2n)(Address Longword
2n + 1)
Access
2n + 1)
Access
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
R High
High
High
High
High
High
RD/WR
W High
R High
High
High
High
High
High
High
High
High
High
High
BS
RAS/CE
CAS/CASLL /OE
CASLH
CASHL/CAS2L
CASHH /CAS2H
DQMLL/WE0
W Low
Enabled
Low
Low
High
High
High
R High
Low
Enabled
Low
High
Low
High
High
High
Low
Enabled
Low
Low
Low
High
High
High
Low
Enabled
High
High
High
Low
High
High
Low
Enabled
High
High
High
High
Low
High
Low
Enabled
High
High
High
Low
Low
High
DQMLU/WE1
W High
R High
High
High
High
High
High
High
High
High
High
High
W High
DQMUL/WE2/ICIORD R High
High
High
High
High
High
High
High
High
High
High
W High
DQMUU/WE3/ICIOWR R High
High
High
High
High
High
High
High
High
High
High
MD3/CE2A
MD4/CE2B
MD5/RAS2
W High
High-Z or
high^*1
High-Z or
high^*2
High-Z or
high^*3
High
High-Z or
high^*1
High-Z or
high^*2
High-Z or
high^*3
High
High-Z or
high^*1
High-Z or
high^*2
High-Z or
high^*3
High
High-Z or
high^*1
High-Z or
high^*2
Low
High
High-Z or
high^*1
High-Z or
high^*2
Low
High
High-Z or
high^*1
High-Z or
high^*2
Low
CKE
WAIT
IOIS16
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
A25 to A0
Address
Address
Address
Address
Address
Address
D7 to D0
Valid data Invalid data Valid data Valid data Invalid data Valid data
D15 to D8
Invalid data Valid data Valid data Invalid data Valid data Valid data
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