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DDR2 Memory Controller Registers

Table 26. SDRAM Bank Configuration Register (SDBCR) Field Descriptions (continued)

Bit	Field	Value	Description
11-9	CL	0-7h	CAS latency.
		0-1h	Reserved
		2h	CAS latency of 2
		3h	CAS latency of 3
		4h	CAS latency of 4
		5h	CAS latency of 5
		6h-7h	Reserved
8-7	Reserved	0	Reserved
6-4	IBANK	0-7h	Internal DDR2 bank setup. Defines the number of internal banks on the external DDR2 memory.
		0	1 bank
		1h	2 banks
		2h	4 banks
		3h	8 banks
		4h-7h	Reserved
3	Reserved	0	Reserved. Always write a 0 to this bit.
2-0	PAGESIZE	0-7h	DDR2 page size. Defines the page size of each page of the external DDR2 memory.
		0	256-word page requiring 8 column address bits.
		1h	512-word page requiring 9 column address bits.
		2h	1024-word page requiring 10 column address bits.
		3h	2048-word page requiring 11 column address bits.
		4h-7h	Reserved

SPRU986B–November 2007	DDR2 Memory Controller	43
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