SH7708 Datasheet, PDF (592/625 Pages) Renesas Technology Corp – SuperH™ RISC engine

Table A.9 Pin States (Synchronous DRAM/Little-Endian)
32-Bit Bus Width
Pin
CS6 to CS0
RD
Byte
Access
(Address
4n)
Byte
Access
(Address
4n + 1)
Byte
Access
(Address
4n + 2)
Byte
Access
(Address
4n + 3)
Word
Access
(Address
4n)
Word
Access
(Address
4n + 2)
Longword
Access
Enabled Enabled Enabled Enabled Enabled Enabled Enabled
R High
High
High
High
High
High
High
RD/WR
W High
R High
High
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 Low
Low
Enabled
Low
Low
High
High
High
High
Low
Enabled
Low
Low
High
High
High
High
Low
Enabled
Low
Low
High
High
High
High
Low
Enabled
Low
Low
High
High
High
Low
Low
Enabled
Low
Low
High
High
High
High
Low
Enabled
Low
Low
High
High
High
Low
DQMLU/WE1
W Low
High
High
High
Low
R High
Low
High
High
Low
High
Low
High
Low
W High
Low
High
High
Low
High
Low
DQMUL/WE2/ICIORD R High
High
Low
High
High
Low
Low
W High
High
Low
High
High
Low
Low
DQMUU/WE3/ICIOWR R High
High
High
Low
High
Low
Low
MD3/CE2A
MD4/CE2B
MD5/RAS2
CKE
WAIT
IOIS16
W High
High
High
Low
High
Low
Low
High-Z or High-Z or High-Z or High-Z or High-Z or High-Z or High-Z or
high^*1
high^*1
high^*1
high^*1
high^*1
high^*1
high^*1
High-Z or High-Z or High-Z or High-Z or High-Z or High-Z or High-Z or
high^*2
high^*2
high^*2
high^*2
high^*2
high^*2
high^*2
High-Z High-Z High-Z High-Z High-Z High-Z High-Z
High^*3
High^*3
High^*3
High^*3
High^*3
High^*3
High^*3
Disabled Disabled Disabled Disabled Disabled Disabled Disabled
Disabled Disabled Disabled Disabled Disabled Disabled Disabled
A25 to A0
Address, Address, Address, Address, Address, Address, Address,
command command command command command command command
D7 to D0
Valid
data
Invalid
data
Invalid
data
Invalid
data
Valid
data
Invalid
data
Valid
data
578