Analog-devices ADSP-2181 Bedienungsanleitung PDF herunterladen (Seite 27)

ADSP-2181/ADSP-2183

REV. 0

–27–

ADSP-2181

Parameter Min Max Unit

IDMA Write, Short Write Cycle

Timing Requirements:

IKW

IACK Low before Start of Write

0ns

IWP

Duration of Write

1, 2

15 ns

IDSU

IAD15–0 Data Setup before End of Write

2, 3, 4

5ns

IDH

IAD15–0 Data Hold after End of Write

2, 3, 4

2ns

Switching Characteristics:

IKHW

Start of Write to IACK High 15 ns

ADSP-2183

28.8 MHz

Parameter Min Max Unit

IDMA Write, Short Write Cycle

Timing Requirements:

IKW

IACK Low before Start of Write

0ns

IWP

Duration of Write

1, 2

15 ns

IDSU

IAD15–0 Data Setup before End of Write

2, 3, 4

5ns

IDH

IAD15–0 Data Hold after End of Write

2, 3, 4

2ns

Switching Characteristics:

IKHW

Start of Write to IACK High 17 ns

NOTES

Start of Write = IS Low and IWR Low.

End of Write = IS High or IWR High.

If Write Pulse ends before IACK Low, use specifications t

IDSU

, t

IDH

If Write Pulse ends after IACK Low, use specifications t

IKSU

, t

IKH

IAD 15–0

DATA

IKHW

IKW

IDSU

IACK

IWP

IDH

IWR

Figure 29. IDMA Write, Short Write Cycle

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 39 40

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