Analog-devices ADSP-2181 Instrukcja Użytkownika Pobierz pdf (Strona 30)

ADSP-2181/ADSP-2183

REV. 0

–30–

ADSP-2181

Parameter Min Max Unit

IDMA Read, Short Read Cycle

Timing Requirements:

IKR

IACK Low before Start of Read

0ns

IRP

Duration of Read 15 ns

Switching Characteristics:

IKHR

IACK High after Start of Read

15 ns

IKDH

IAD15–0 Data Hold after End of Read

0ns

IKDD

IAD15–0 Data Disabled after End of Read

10 ns

IRDE

IAD15–0 Previous Data Enabled after Start of Read 0 ns

IRDV

IAD15–0 Previous Data Valid after Start of Read 15 ns

ADSP-2183

28.8 MHz

Parameter Min Max Unit

IDMA Read, Short Read Cycle

Timing Requirements:

IKR

IACK Low before Start of Read

0ns

IRP

Duration of Read 15 ns

Switching Characteristics:

IKHR

IACK High after Start of Read

17 ns

IKDH

IAD15–0 Data Hold after End of Read

0ns

IKDD

IAD15–0 Data Disabled after End of Read

10 ns

IRDE

IAD15–0 Previous Data Enabled after Start of Read 0 ns

IRDV

IAD15–0 Previous Data Valid after Start of Read 15 ns

NOTES

Start of Read = IS Low and IRD Low.

End of Read = IS High or IRD High.

IRP

IKR

DATA

IKHR

IRDV

IKDD

IRDE

IKDH

IAD 15–0

IACK

IRD

Figure 32. IDMA Read, Short Read Cycle

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 39 40

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