Epson S1C33L03 manual 133

APPENDIX A <REFERENCE> EXTERNAL DEVICE INTERFACE TIMINGS

A-1

A.2 DRAM (60ns)

DRAM interface setup examples – 60ns

Operating	RAS precharge	RAS cycle	CAS cycle	Refresh RAS pulse	Refresh RPC delay
frequency	cycle			width

20MHz	1	1	2	2	1
25MHz	2	1	2	2	1
33MHz	2	2	2	3	1

DRAM interface timing – 60ns

DRAM interface		Unit: ns		33MHz		25MHz		20MHz
Parameter	Symbol	Min.	Max.	Cycle	Time	Cycle	Time	Cycle	Time	A-ap
<Common parameters>
Random read/random write cycle time	tRC	110	–	6	180	5	200	4	200
#RAS precharge time	tRP	40	–	2	60	2	80	1	50
#RAS pulse width	tRAS	60	10000	4	120	3	120	3	150
#CAS pulse width	tCAS	15	10000	1.5	45	1.5	60	1.5	75
Row address setup time	tASR	0	–	0.5	15	0.5	20	0.5	25
Row address hold time	tRAH	10	–	1.5	45	0.5	20	0.5	25
Column address setup time	tASC	0	–	0.5	15	0.5	20	0.5	25
#RAS→ #CAS delay time	tRCD	20	–	2.0	60	1.0	40	1.0	50
#RAS→ column address delay time	tRAD	15	–	1.5	45	0.5	20	0.5	25
<Read-cycle parameters>
#RAS access time	tRAC	–	60	3.5	105	2.5	100	2.5	125
#CAS access time	tCAC	–	15	1.5	45	1.5	60	1.5	75
Address access time	tAA	–	30	2.0	60	2.0	80	2.0	100
#OE access time	tOAC	–	15	3.5	105	2.5	100	2.5	125
Output buffer turn-off time	tOFF	0	15	2	60	2	80	1	50
<Write-cycle parameters>
Data input hold time	tDH	10	–	1.5	45	1.5	60	1.5	75
<Fast-page mode>
Fast-page mode cycle time	tPC	40	–	2.0	60	2.0	80	2.0	100
Fast-page mode #CAS precharge time	tCP	10	–	0.5	15	0.5	20	0.5	25
Access time after #CAS precharge	tACP	–	35	2.0	60	2.0	80	2.0	100
<Refresh cycle>
#CAS setup time	tCSR	10	–	1.0	30	1.0	40	1.0	50
#CAS hold time	tCHR	10	–	2.5	75	1.5	60	1.5	75
#RAS precharge→ #CAS hold time	tPPC	10	–	1.0	30	1.0	40	1.0	50
#RAS pulse width (only in refresh cycle)	tRAS	60	10000	3.0	90	2.0	80	2.0	100

S1C33L03 PRODUCT PART EPSON A-117