MC9328MX21CJM datasheet(49/100 Pages) FREESCALE

Part #	MC9328MX21CJM

Description	266 MHz i.MX family of microprocessors

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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Specifications

MC9328MX21 Technical Data, Rev. 3.4

Freescale Semiconductor

49

Figure 40. SDRAM Refresh Timing Diagram

Table 32. SDRAM Write Cycle Timing Parameter

Ref

No.

Parameter

1.8 V

± 0.1 V

3.0 V

± 0.3 V

Unit

Minimum

Maximum

Minimum

Maximum

1

SDRAM clock high-level width

3.00

–

3

–

ns

2

SDRAM clock low-level width

3.00

–

3

–

ns

3

SDRAM clock cycle time

7.5

–

7.5

–

ns

4

Address setup time

3.67

–

2

–

ns

5

Address hold time

2.95

–

2

–

ns

6

Precharge cycle period1

1. Precharge cycle timing is included in the write timing diagram.

tRP2

2. tRP and tRCD = SDRAM clock cycle time. These settings can be found in the i.MX21 reference manual.

–tRP2

–ns

7

Active to read/write command delay

tRCD2

–tRCD2

–ns

8

Data setup time

3.41

–

2

–

ns

9

Data hold time

2.45

–

2

–

ns

SDCLK

CS

CAS

WE

RAS

ADDR

DQ

DQM

BA

3

4

6

1

2

5

7

ROW/BA

7

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