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APPENDIX A <REFERENCE> EXTERNAL DEVICE INTERFACE TIMINGS
A-98 EPSON S1C33210 PRODUCT PART
DRAM: 60ns, CPU: 25MHz, random read/write cycle
1
RAS cycle CAS cycle RAS precharge
2
tRAS
2
BCLK
A[11:0]
#RAS
#CAS
#RD
D[15:0](RD)
#WE
D[15:0](WR)
ROW #1
RD data
ROW #2
WR data
COL #1
DRAM: 60ns, CPU: 25MHz, page-mode read/write cycle
1
RAS cycle CAS cycle RAS precharge
2
CAS cycle
2 2
tRAS
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: 60ns, CPU: 25MHz, CAS-before-RAS refresh cycle
1 1
RPC delay Fixed Refresh RAS pulse width
2
RAS precharge
2
tRPC tCSR tCHR
tRAS
BCLK
#RAS
#CAS