Epson S1C33210 manual 187

II CORE BLOCK: BCU (Bus Control Unit)

Register name	Address	Bit	Name	Function					Setting				Init.	R/W	Remarks
Areas 6–4	004812A	DF–E	–	reserved						–			–	–	0 when being read.
set-up register	(HW)	DD	A6DF1	Area 6	A6DF[1:0]					Number of cycles			1	R/W
		DC	A6DF0	output disable delay time	1			1				3.5	1
					1			0				2.5
					0			1				1.5
					0			0				0.5
		DB	–	reserved						–			–	–	0 when being read.
		DA	A6WT2	Area 6 wait control	A6WT[2:0]						Wait cycles		1	R/W
		D9	A6WT1		1		1	1				7	1
		D8	A6WT0		1		1	0				6	1
					1		0	1				5
					1		0	0				4
					0		1	1				3
					0		1	0				2
					0		0	1				1
					0		0	0				0
		D7	–	reserved						–			–	–	0 when being read.
		D6	A5SZ	Areas 5–4 device size selection	1	8 bits					0	16 bits	0	R/W
		D5	A5DF1	Areas 5–4	A5DF[1:0]					Number of cycles			1	R/W
		D4	A5DF0	output disable delay time	1			1				3.5	1
					1			0				2.5
					0			1				1.5
					0			0				0.5
		D3	–	reserved									–	–	0 when being read.
		D2	A5WT2	Areas 5–4 wait control	A5WT[2:0]						Wait cycles		1	R/W
		D1	A5WT1		1		1	1				7	1
		D0	A5WT0		1		1	0				6	1
					1		0	1				5
					1		0	0				4
					0		1	1				3
					0		1	0				2
					0		0	1				1
					0		0	0				0
Bus control	004812E	DF	RBCLK	BCLK output control	1	Fixed at H					0	Enabled	0	R/W
register	(HW)	DE	–	reserved						–			0	–	Writing 1 not allowed.
		DD	RBST8	Burst ROM burst mode selection	1	8-successive					0	4-successive	0	R/W
		DC	REDO	DRAM page mode selection	1	EDO					0	Fast page	0	R/W
		DB	RCA1	Column address size selection	RCA[1:0]							Size	0	R/W
		DA	RCA0		1			1				11	0
					1			0				10
					0			1				9
					0			0				8
		D9	RPC2	Refresh enable	1	Enabled					0	Disabled	0	R/W
		D8	RPC1	Refresh method selection	1	Self-refresh					0	CBR-refresh	0	R/W
		D7	RPC0	Refresh RPC delay setup	1	2.0					0	1.0	0	R/W
		D6	RRA1	Refresh RAS pulse width	RRA[1:0]					Number of cycles			0	R/W
		D5	RRA0	selection	1			1				5	0
					1			0				4
					0			1				3
					0			0				2
		D4	–	reserved						–			0	–	Writing 1 not allowed.
		D3	SBUSST	External interface method selection	1	#BSL					0	A0	0	R/W
		D2	SEMAS	External bus master setup	1	Existing					0	Nonexistent	0	R/W
		D1	SEPD	External power-down control	1	Enabled					0	Disabled	0	R/W
		D0	SWAITE	#WAIT enable	1	Enabled					0	Disabled	0	R/W

S1C33210 FUNCTION PART EPSON B-II-4-35