mc94mx21 Freescale Semiconductor, Inc, mc94mx21 Datasheet - Page 48

• Manufacturer Part Number: mc94mx21
• Description: 333 And 350 Mhz
• Manufacturer: Freescale Semiconductor, Inc

Specifications
48
1. Precharge cycle timing is included in the write timing diagram.
2. t
Ref
No.
RP
SDCLK
1
2
3
4
5
6
7
8
9
ADDR
DQM
RAS
CAS
and t
WE
DQ
CS
SDRAM clock high-level width
SDRAM clock low-level width
SDRAM clock cycle time
Address setup time
Address hold time
Precharge cycle period
Active to read/write command delay
Data setup time
Data hold time
RCD
= SDRAM clock cycle time. These settings can be found in the i.MX21 reference manual.
BA
4
1
Parameter
3
5
Table 31. SDRAM Write Cycle Timing Parameter
1
Figure 40. SDRAM Refresh Timing Diagram
6
2
MC94MX21 Technical Data, Rev. 1.4
Minimum
t
3.00
3.00
3.67
2.95
3.41
2.45
t
RCD
7.5
RP
1.8 V ± 0.1 V
2
2
7
Maximum
–
–
–
–
–
–
–
–
–
Minimum
t
t
RCD
7.5
RP
3
3
2
2
2
2
7
3.0 V ± 0.3 V
2
2
ROW/BA
Freescale Semiconductor
Maximum
–
–
–
–
–
–
–
–
–
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns