SDRAM Address Mapping for 16-bit Memory Data Bus Width

Table 1. SDRAM Configuration Mapping: 2K Rows, 256/512/1024/2048 Columns
CPU Address Line
27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
						Bk[1:0]		Row[10:0]											Column[7:0]								M0
					Bk[1:0]		Row[10:0]											Column[8:0]									M0
				Bk[1:0]		Row[10:0]											Column[9:0]										M0
			Bk[1:0]		Row[10:0]											Column[10:0]											M0

Note: M0 is the byte address inside a 16-bit half-word and Bk[1] = BA1, Bk[0] = BA0.

Table 2. SDRAM Configuration Mapping: 4K Rows, 256/512/1024/2048 Columns
CPU Address Line
27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
					Bk[1:0]		Row[11:0]												Column[7:0]								M0
				Bk[1:0]		Row[11:0]												Column[8:0]									M0
			Bk[1:0]		Row[11:0]												Column[9:0]										M0
		Bk[1:0]		Row[11:0]												Column[10:0]											M0

Note: M0 is the byte address inside a 16-bit half-word and Bk[1] = BA1, Bk[0] = BA0.

Table 3. SDRAM Configuration Mapping: 8K Rows, 256/512/1024/2048 Columns
CPU Address Line
27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
				Bk[1:0]		Row[12:0]													Column[7:0]								M0
			Bk[1:0]		Row[12:0]													Column[8:0]									M0
		Bk[1:0]		Row[12:0]													Column[9:0]										M0
	Bk[1:0]		Row[12:0]													Column[10:0]											M0

Note: M0 is the byte address inside a 16-bit half-word and Bk[1] = BA1, Bk[0] = BA0.