Laptop User Manual

Intel® PXA26x Processor Family Developer’s Manual 6-27
Memory Controller
6.6.6 SDRAM Waveforms
Additional waveforms for the SDRAM controller are shown in Figure 6-5, Figure 6-6, Figure 6-7,
Figure 6-8, Figure 6-9, Figure 6-10.
Figure 6-5. SDRAM Read
Figure 6-6. SDRAM Read With a Second Read to Same Bank, Same Row
CLCLtRCDtRCDtRPtRP
bank row col
0 123
tRP = 2 clks
tRAS = 2 clks
tRCD = 2 clks
CL = 2 clks
0000
0ns 50ns 100ns 150ns 200ns
SDCLK
nSDCS
MA[24:0]
nSDRAS
nSDCAS
nWE
DATA
DQM[3:0]
CLCLCLCLtRCDtRCDtRPtRP
bank row col
0123
0000
tRP = 2 clks
tRAS = 5 clks
tRCD = 2 clks
CL = 2 clks
col
4567
0ns 50ns 100ns
SDCLK
nSDCS
MA[24:0]
nSDRAS
nSDCAS
nWE
DATA
DQM[3:0]