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Table 9-26, Ide multiword dma data transfer timing parameters – AMD Geode SC3200 User Manual

Page 387

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AMD Geode™ SC3200 Processor Data Book

387

Electrical Specifications

32581C

Table 9-26. IDE Multiword DMA Data Transfer Timing Parameters

Symbol

Parameter

Mode

Unit

Comments

0

1

2

t

0

Cycle time (min)

480

150

120

ns

Note 1

t

D

IDE_IOR[0:1]#/IDE_IOW[0:1]# (min)

215

80

70

ns

t

E

IDE_IOR[0:1]# data access (max)

150

60

50

ns

t

F

IDE_IOR[0:1]# data hold (min)

5

5

5

ns

t

G

IDE_IOW[0:1]#/IDE_IOW[0:1]# data setup
(min)

100

30

20

ns

t

H

IDE_IOW[0:1]# data hold (min)

20

15

10

ns

t

I

IDE_DACK[0:1]# to IDE_IOR[0:1]#/
IDE_IOW[0:1]# setup (min)

0

0

0

ns

t

J

IDE_IOR[0:1]#/IDE_IOW[0:1]# to
IDE_DACK[0:1]# hold (min)

20

5

5

ns

t

KR

IDE_IOR[0:1]# negated pulse width (min)

50

50

25

ns

t

KW

IDE_IOW[0:1]# negated pulse width (min)

215

50

25

ns

t

LR

IDE_IOR[0:1]# to IDE_DREQ[0:1] delay
(max)

120

40

35

ns

t

LW

IDE_IOW[0:1]# to IDE_DREQ0,1 delay
(max)

40

40

35

ns

t

M

IDE_CS[0:1]# valid to IDE_IOR[0:1]#/
IDE_IOW[0:1]# (min)

50

30

25

ns

t

N

IDE_CS[0:1]# hold

15

10

10

ns

t

Z

IDE_DACK[0:1]# to TRI-STATE

20

25

25

ns

Note 1. t

0

is the minimum total cycle time, t

D

is the minimum command active time, and t

KR

or t

KW

is the minimum command

recovery time or command inactive time. The actual cycle time equals the sum of the command active time and the
command inactive time. The three timing requirements of t

0

, t

D

and t

KR/KW

, are met. The minimum total cycle time

requirement t

0

is greater than the sum of t

D

and t

KR/KW

. (This means that a host implementation can lengthen t

D

and/or t

KR/KW

to ensure that t

0

is equal to or greater than the value reported in the device’s IDENTIFY DEVICE

data.)