Intel PXA250 and PXA210 Applications Processors
Intel PXA250 and PXA210 Applications Processors
Intel PXA250 and PXA210 Applications Processors
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System Memory Interface<br />
Figure 2-2. SDRAM Memory System Example<br />
nSDCS(3:0)<br />
nSDRAS, nSDCAS, nWE, CKE(1)<br />
SDCLK(2:1)<br />
MA(23:10)<br />
4Mx16<br />
SDRAM<br />
4Mx16<br />
SDRAM<br />
4Mx16<br />
SDRAM<br />
0<br />
nCS<br />
1<br />
nCS<br />
2<br />
nCS<br />
nRAS<br />
nRAS<br />
nRAS<br />
nCAS<br />
nCAS<br />
nCAS<br />
nWE<br />
nWE<br />
nWE<br />
1<br />
CKE<br />
CLK<br />
1<br />
CKE<br />
CLK<br />
2<br />
CKE<br />
CLK<br />
addr(11:0)<br />
addr(11:0)<br />
addr(11:0)<br />
0<br />
1<br />
BA(1:0)<br />
DQML<br />
DQMH<br />
BA(1:0)<br />
DQML<br />
DQMH<br />
BA(1:0)<br />
DQML<br />
DQMH<br />
15:0<br />
DQ(15:0)<br />
DQ(15:0)<br />
DQ(15:0)<br />
MD(31:0)<br />
DQM(3:0)<br />
4Mx16<br />
SDRAM<br />
4Mx16<br />
SDRAM<br />
4Mx16<br />
SDRAM<br />
0<br />
nCS<br />
1<br />
nCS<br />
2<br />
nCS<br />
nRAS<br />
nRAS<br />
nRAS<br />
nCAS<br />
nCAS<br />
nCAS<br />
nWE<br />
nWE<br />
nWE<br />
31:16<br />
1<br />
2<br />
3<br />
CKE<br />
CLK<br />
addr(11:0)<br />
BA(1:0)<br />
DQML<br />
DQMH<br />
DQ(15:0)<br />
1<br />
CKE<br />
CLK<br />
addr(11:0)<br />
BA(1:0)<br />
DQML<br />
DQMH<br />
DQ(15:0)<br />
2<br />
21:10<br />
23:22<br />
CKE<br />
CLK<br />
addr(11:0)<br />
BA(1:0)<br />
DQML<br />
DQMH<br />
DQ(15:0)<br />
2-4 <strong>PXA250</strong> <strong>and</strong> <strong>PXA210</strong> <strong>Applications</strong> <strong>Processors</strong> Design Guide