Basic Sdram Timing Parameters; Sdram_Read_Diffbank_Diffrow - Intel PXA255 Developer's Manual

Figure 6-5. Basic SDRAM Timing Parameters
0ns
SDCLK
nSDCS
MA[24:0]
nSDRAS
nSDCAS
nWE
DATA
DQM[3:0]
Figure 6-6. SDRAM_Read_diffbank_diffrow
0ns
tRP = 2 clks
tRAS = 7 clks
tRCD = 2 clks
CL = 2 clks
SDCLK
nSDCS
MA[24:0]
nSDRAS
nSDCAS
nWE
DATA
DQM[3:0]
Intel® PXA255 Processor Developer's Manual
50ns
tRP tRP tRCD tRCD
bank row
25ns
tRP tRP
tRCD tRCD CL CL
row col bank0
100ns
CL CL
col
0
tRP = 2 clks
tRAS = 2 clks
tRCD = 2 clks
CL = 2 clks
50ns 75ns
tRCD tRCD CL CL
row col
0 1 2 3
0000
Memory Controller
150ns 200ns
1 2 3
0000
100ns 125ns
1 2 3 4
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