Epson S1C33L03 manual 108

8 ELECTRICAL CHARACTERISTICS

DRAM CAS-before-RAS refresh cycle

CBR refresh cycle

CCBR1 CCBR2 CCBR3

BCLK

tRASD1tRASD2

#RAS

tCASD1 tCASD2

#HCAS/

#LCAS

#WE

DRAM self-refresh cycle

Self-refresh mode setup	Self-refresh mode	Self-refresh mode canceration
		6-cycle precharge
		(Fixed)

BCLK
tRASD1	tRASD2
#RAS
tCASD1	tCASD2

#HCAS/

#LCAS

SDRAM clock

(1) #X2SPD = high (CPU clock : SDRAM clock = 1 : 1)

OSC3 (High-speed clock)

tC3

tCBH tCBD = tCBH/tC3

BCLK

(SDRAM clock output)

(2) #X2SPD = low (CPU clock : SDRAM clock = 2 : 1)

tC3

tCBH tCBD = tCBH/tC3

BCLK

(SDRAM clock output)

A-92 EPSON S1C33L03 PRODUCT PART