Intel PXA255 - Manual (Page 212)

6-30 Intel® PXA255 Processor Developer’s Manual
Memory Controller
Figure 6-7. SDRAM_read_samebank_diffrow
Figure 6-8. SDRAM_read_samebank_samerow
CL CL tRCD tRP tRCD
tRAS
tRP CL CL tRCD
tRAS
tRCD
row col
0 1 2 3
0000
tRP = 2 clks
tRAS = 7 clks
tRCD = 2 clks
CL = 2 clks
bank row
4 5 6 7
col
0000
0ns 50ns 100ns 150ns
SDCLK
nSDCS
MA[24:0]
nSDRAS
nSDCAS
nWE
DATA
DQM[3:0]
CL CL CL CL tRCD tRCD tRP tRP
bank row col
0 1 2 3
0000
tRP = 2 clks
tRAS = 5 clks
tRCD = 2 clks
CL = 2 clks
col
4 5 6 7
0ns 50ns 100ns
SDCLK
nSDCS
MA[24:0]
nSDRAS
nSDCAS
nWE
DATA
DQM[3:0]