I.MX27 Datasheet, PDF (75/148 Pages) Freescale Semiconductor, Inc – Multimedia Applications Processor

SDCLK
SDCLK
CS
RAS
CAS
SD11
SD4
WE
ADDR
SD6
BA
SD5
SD7
ROW / BA
DQ
Electrical Characteristics
SD1
SD2
SD3
SD4
SD5
SD4
SD5
SD4
SD5
SD12
COL/BA
SD13
DATA
SD14
DQM
Figure 38. SDR SDRAM Write Cycle Timing Diagram
Table 38. SDR SDRAM Write Timing Parameters
ID
SD1
SD2
SD3
SD4
SD5
SD6
SD7
SD11
SD12
Parameter
SDRAM clock high-level width
SDRAM clock low-level width
SDRAM clock cycle time
CS, RAS, CAS, WE, DQM, CKE setup time
CS, RAS, CAS, WE, DQM, CKE hold time
Address setup time
Address hold time
Precharge cycle period¹
Active to read/write command delay¹
Symbol
Min
tCH
3.4
tCL
3.4
tCK
7.5
tCMS
2.0
tCMH
1.8
tAS
2.0
tAH
1.8
tRP
1
tRCD
1
Max
Unit
4.1
ns
4.1
ns
—
ns
—
ns
—
ns
—
ns
—
ns
4
clock
8
clock
i.MX27 and i.MX27L Data Sheet, Rev. 1.5
Freescale Semiconductor
75