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Intel® PXA26x Processor Family Developer’s Manual 6-19
Memory Controller
Table 6-4 shows how the SDRAM row and column addresses are mapped to the internal SDRAM
address. The SDRAM row and column addresses are muxed. The SDRAM row is sent during an
Active command and is followed by the column address during the read or write command.
MA<20> is driven with 0 during column addressing. BA[1:0] tells the SDRAM which bank is
being read from and remains stable during column addressing. During SDRAM configuration, all
the address pins are used to transfer the MRS command.
Figure 6-4. External to Internal Address Mapping Options
Table 6-8. External to Internal Address Mapping for Normal Bank Addressing (Sheet 1 of 2)
# Bits
Bank x
Row x
Col x
Data
External Address pins at SDRAM RAS Time
MA<24:10>
External Address pins at SDRAM CAS Time
MA<24:10>
24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
1x11x8x32 212019181716151413121110 21‘0’ 9 8 7 6 5 4 3 2
1x11x8x16 2019181716151413121110 9 20‘0’ 8 7 6 5 4 3 2 1
1x11x9x32 222120191817161514131211 22‘0’ 10 9 8 7 6 5 4 3 2
1x11x9x16 212019181716151413121110 21‘0’ 9 8 7 6 5 4 3 2 1
1x11x10x32 23 22 21 20 19 18 17 16 15 14 13 12 23 ‘0’ 11 10 9 8 7 6 5 4 3 2
1x11x10x16 22 21 20 19 18 17 16 15 14 13 12 11 22 ‘0’ 10 9 8 7 6 5 4 3 2 1
1x11x11x32 NOT VALID (illegal addressing combination) NOT VALID (illegal addressing combination)
1x11x11x16 NOT VALID (illegal addressing combination) NOT VALID (illegal addressing combination)
1x12x8x32 22212019181716151413121110 22 ‘0’ 9 8 7 6 5 4 3 2
1x12x8x16 212019181716151413121110 9 21 ‘0’ 8 7 6 5 4 3 2 1
1x12x9x32 23222120191817161514131211 23 ‘0’ 10 9 8 7 6 5 4 3 2
1x12x9x16 22212019181716151413121110 22 ‘0’ 9 8 7 6 5 4 3 2 1
1x12x10x32 24 23 22 21 20 19 18 17 16 15 14 13 12 24 ‘0’ 11 10 9 8 7 6 5 4 3 2
1x12x10x16 23 22 21 20 19 18 17 16 15 14 13 12 11 23 ‘0’ 10 9 8 7 6 5 4 3 2 1
1x12x11x32 25242322212019181716151413 2512‘0’1110 9 8 7 6 5 4 3 2
1x12x11x16 24232221201918171615141312 2411‘0’10 9 8 7 6 5 4 3 2 1
1x13x8x32 2322212019181716151413121110 23 ‘0’ 9 8 7 6 5 4 3 2