DSP56004UMSLASHAD datasheet(35/82 Pages) FREESCALE

35 / 82 page

Specifications

External Memory Interface (EMI) DRAM Timing

MOTOROLA

DSP56004/D, Rev. 3

2-11

65 WR Deassertation to

CAS Assertion

tRCS

slow

fast

× T

C – 11

× T

C – 11

169

109

—

125

—

100

63.1

—

66 CAS Assertion to WR

Deassertation

tWCH

slow

fast

× T

C – 13

× T

C – 13

—

11.7

—

67 Data Valid to CAS

Assertion

(Data Setup Time)

tDS

TL – 6

4—2—

0.2

—

68 CAS Assertion to Data

Not Valid (Data Hold

Time)

tDH

slow

fast

× T

C + TH –

× T

C + TH –

—

29.2

16.8

—

69 RAS Assertion to Data

Not Valid

tDHR

slow

fast

× T

C + TH –

× T

C + TH –

136

—

100

—

78.6

53.9

—

70 WR Assertion to CAS

Assertion

tWCS

slow

fast

× T

C – 14

× T

C – 14

—

35.4

—

71 WR Assertion Pulse

Width (Single Cycle

Only)

tWP

slow

fast

× T

C – 9

× T

C – 9

131

—

77.4

52.7

—

72 RAS Assertion to WR

Deassertation

(Single Cycle Only)

tWCR

slow

fast

× T

C – 15

× T

C – 15

125

—

71.5

46.7

—

73 WR Assertion to Data

Active

slow

fast

× T

C + TH –

× T

C + TH –

—

30.2

17.9

—

74 RD or WR Assertion to

RAS Deassertation

(Single Cycle Only)

tROH,

tRWL

slow

fast

× T

C – 13

× T

C – 13

127

—

73.4

48.7

—

Note:

n is the number of successive accesses. n = 2, 3, 4, or 6.

Table 2-8

External Memory Interface (EMI) DRAM Timing (Continued)

No.

Characteristics

Symbol

Timing

Mode

Expression

50 MHz

66 MHz

81 MHz

Unit

Min Max Min Max Min Max

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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