DSP56362AD datasheet(74/168 Pages) MOTOROLA

74 / 168 page

2-36

DSP56362 Advance Information

MOTOROLA

Specifications

External Memory Expansion Port (Port A)

186 CAS assertion to data not valid (write)

tDH

3.25

× TC − 4.0 36.6 —

187 RAS assertion to data not valid (write)

tDHR

5.75

× TC − 4.0 67.9 —

188 WR assertion to CAS assertion

tWCS

5.5

× TC − 4.3 64.5 —

189 CAS assertion to RAS assertion (refresh)

tCSR

1.5

× TC − 4.0 14.8 —

190 RAS deassertion to CAS assertion (refresh)

tRPC

1.75

× TC − 4.0 17.9 —

191 RD assertion to RAS deassertion

tROH

8.5

× TC − 4.0

102.

—ns

192 RD assertion to data valid

tGA

7.5

× TC − 6.5

—

87.3

193 RD deassertion to data not valid4

tGZ

0.0

—

194 WR assertion to data active

0.75

× TC − 0.3 9.1

—

195 WR deassertion to data high impedance

0.25

× TC

—3.1

Notes:

The number of wait states for out-of-page access is specified in the DCR.

The refresh period is specified in the DCR.

The asynchronous delays specified in the expressions are valid for DSP56362.

RD deassertion will always occur after CAS deassertion; therefore, the restricted timing is tOFF

and not tGZ.

Either tRCH or tRRH must be satisfied for read cycles.

Table 2-15 DRAM Out-of-Page and Refresh Timings,

Eleven Wait States1, 2

No.

Characteristics4

Symbol

Expression3

100 MHz

Unit

Min

Max

157 Random read or write cycle time

tRC

× TC

120.0

—

158 RAS assertion to data valid (read)

tRAC

6.25

× TC − 7.0

—

55.5

159 CAS assertion to data valid (read)

tCAC

3.75

× TC − 7.0

—

30.5

160 Column address valid to data valid

(read)

tAA

4.5

× TC − 7.0

—

38.0

161 CAS deassertion to data not valid (read

hold time)

tOFF

0.0

—

162 RAS deassertion to RAS assertion

tRP

4.25

× TC − 4.0

38.5

—

163 RAS assertion pulse width

tRAS

7.75

× TC − 4.0

73.5

—

164 CAS assertion to RAS deassertion

tRSH

5.25

× TC − 4.0

48.5

—

165 RAS assertion to CAS deassertion

tCSH

6.25

× TC − 4.0

58.5

—

Table 2-14 DRAM Out-of-Page and Refresh Timings, Eight Wait States1, 2 (Continued)

No.

Characteristics4

Symbol

Expression3

80 MHz

Unit

Min Max

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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