DSP56004ROM datasheet(34/82 Pages) FREESCALE

34 / 82 page

2-10

DSP56004/D, Rev. 3

MOTOROLA

Specifications

External Memory Interface (EMI) DRAM Timing

54 CAS Deassertation Pulse

Width

(Page Mode Access

Only)

tCP

TC – 5

—

7.3

—

55 Row Address Valid to

RAS Assertion

(Row Address Setup

Time)

tASR

TL – 6

4—2—

0.2

—

56 RAS Assertion to ROW

Address Not Valid

(Row Address Hold

Time)

tRAH

slow

fast

× T

C + TH –

× T

C + TH –

—

29.2

16.9

—

57 Column Address Valid

to CAS Assertion

(Column Address Setup

Time)

tASC

TL – 6

4—2—

0.2

—

58 CAS Assertion to

Column Address Not

Valid

(Column Address Hold

Time)

tCAH

slow

fast

× T

C + TH –

× T

C + TH –

—

29.2

16.9

—

59 Last CAS Assertion to

Column Address Not

Valid (Column Address

Hold Time)

tCAH

slow

fast

× T

C + TH –

4 × T

C + TH –

136

—

100

—

78.6

41.6

—

60 RAS Assertion to

Column Address Not

Valid

tAR

slow

fast

× T

C + TH –

× T

C + TH –

136

—

100

—

78.6

53.9

—

61 Column Address Valid

to RAS Deassertation

tRAL

slow

fast

× T

C + TL – 7

× T

C + TL – 7

—

36.2

23.9

—

62 CAS, RAS, RD, or WR

Deassertation to WR or

RD Assertion

tRCH,

tRRH

slow

fast

× T

C – 11

× T

C – 11

—

50.7

26.0

—

63 CAS or RD Deassertation

to Data Not Valid

(Data Hold Time)

tOFF, tGZ

0—0—

—

64 Random Read or Write

Cycle Time (Single

Access Only)

tRC

slow

fast

× T

240

160

—

182

121

—

148

98.8

—

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

DSP56004ROM Folha de dados(PDF) 34 Page - Freescale Semiconductor, Inc

DSP56004ROM Folha de dados(HTML) 34 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82

Folha de dados Download

Ligação URL