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APPENDIX A <REFERENCE> EXTERNAL DEVICE INTERFACE TIMINGS
A-94 EPSON S1C33210 PRODUCT PART
DRAM: 70ns, CPU: 33MHz, random read/write cycle
2
RAS cycle CAS cycle RAS precharge
3
t
RC
t
RAD
t
RAH
t
RCD
t
RAC
t
OAC
t
AA
t
CAC
t
OFF
t
CAS
t
ASC
t
RAS
t
ASR
t
WP
t
RP
2
BCLK
A[11:0]
#RAS
#CAS
#RD
D[15:0](RD)
#WE
D[15:0](WR)
ROW #1
RD data
ROW #2
t
DH
t
DS
WR data
COL #1
DRAM: 70ns, CPU: 33MHz, page-mode read/write cycle
2
RAS cycle CAS cycle RAS precharge
3
CAS cycle
3
t
PC
t
ACP
t
CP
t
RAS
2
BCLK
A[11:0]
#RAS
#CAS
#RD
D[15:0](RD)
#WE
D[15:0](WR)
ROW #1
RD data
RD data
WR data WR data
COL #1 COL #2
DRAM: 70ns, CPU: 33MHz, CAS-before-RAS refresh cycle
1 1
RPC delay Fixed Refresh RAS pulse width
3
RAS precharge
2
tRPC tCSR tCHR
tRAS
BCLK
#RAS
#CAS