DSP56364 datasheet(38/148 Pages) FREESCALE

38 / 148 page

External Memory Expansion Port (Port A)

DSP56364 Technical Data, Rev. 4.1

3-22

Freescale Semiconductor

Table 3-11 DRAM Page Mode Timings, Three Wait States1, 2, 3

No.

Characteristics

Symbol

Expression4

Min

Max

Unit

131

Page mode cycle time for two consecutive accesses of the

same direction

Page mode cycle time for mixed (read and write) accesses

tPC

× T

1.25

× T

40.0

35.0

—

132

CAS assertion to data valid (read)

tCAC

× T

C − 7.0

—

13.0

133

Column address valid to data valid (read)

tAA

× T

C − 7.0

—

23.0

134

CAS deassertion to data not valid (read hold time)

tOFF

0.0

—

135

Last CAS assertion to RAS deassertion

tRSH

2.5

× T

C − 4.0

21.0

—

136

Previous CAS deassertion to RAS deassertion

tRHCP

4.5

× T

C − 4.0

41.0

—

137

CAS assertion pulse width

tCAS

× T

C − 4.0

16.0

—

138

Last CAS deassertion to RAS assertion5

• BRW[1:0] = 00

tCRP

2.25

× T

C − 6.0

—

• BRW[1:0] = 01

3.75

× T

C − 6.0

—

• BRW[1:0] = 10

4.75

× T

C − 6.0

41.5

—

• BRW[1:0] = 11

6.75

× T

C − 6.0

61.5

—

139

CAS deassertion pulse width

tCP

1.5

× T

C − 4.0

11.0

—

140

Column address valid to CAS assertion

tASC

TC − 4.0

6.0

—

141

CAS assertion to column address not valid

tCAH

2.5

× T

C − 4.0

21.0

—

142

Last column address valid to RAS deassertion

tRAL

× T

C − 4.0

36.0

—

143

WR deassertion to CAS assertion

tRCS

1.25

× T

C − 4.0

8.5

—

144

CAS deassertion to WR assertion

tRCH

0.75

× T

C − 4.0

3.5

—

145

CAS assertion to WR deassertion

tWCH

2.25

× T

C − 4.2

18.3

—

146

WR assertion pulse width

tWP

3.5

× T

C − 4.5

30.5

—

147

Last WR assertion to RAS deassertion

tRWL

3.75

× T

C − 4.3

33.2

—

148

WR assertion to CAS deassertion

tCWL

3.25

× T

C − 4.3

28.2

—

149

Data valid to CAS assertion (write)

tDS

0.5

× T

C − 4.0

1.0

—

150

CAS assertion to data not valid (write)

tDH

2.5

× T

C − 4.0

21.0

—

151

WR assertion to CAS assertion

tWCS

1.25

× T

C − 4.3

8.2

—

DSP56364 데이터시트(PDF) 38 Page - Freescale Semiconductor, Inc

DSP56364 데이터시트(HTML) 38 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 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL