Analog-devices ADSP-2181 Manual de usuario descargar pdf (Pagina 28)

ADSP-2181/ADSP-2183

REV. 0

–28–

ADSP-2181

Parameter Min Max Unit

IDMA Write, Long Write Cycle

Timing Requirements:

IKW

IACK Low before Start of Write

0ns

IKSU

IAD15–0 Data Setup before IACK Low

2, 3

0.5t

+ 10 ns

IKH

IAD15–0 Data Hold after IACK Low

2, 3

2ns

Switching Characteristics:

IKLW

Start of Write to IACK Low

1.5t

IKHW

Start of Write to IACK High 15 ns

ADSP-2183

28.8 MHz

Parameter Min Max Unit

IDMA Write, Long Write Cycle

Timing Requirements:

IKW

IACK Low before Start of Write

0ns

IKSU

IAD15–0 Data Setup before IACK Low

2, 3

0.5t

+ 10 ns

IKH

IAD15–0 Data Hold after IACK Low

2, 3

2ns

Switching Characteristics:

IKLW

Start of Write to IACK Low

1.5t

IKHW

Start of Write to IACK High 17 ns

NOTES

Start of Write = IS Low and IWR Low.

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

This is the earliest time for IACK Low from Start of Write. For IDMA Write cycle relationships, please refer to the User’s Manual.

IAD 15–0

DATA

IKHW

IKW

IACK

IWR

IKLW

IKH

IKSU

Figure 30. IDMA Write, Long Write Cycle

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 39 40

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Analog-devices ADSP-2181 Manual de usuario Pagina 28

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