Analog-devices ADSP-2181 Manual do Utilizador descarregar pdf (Página 23)

ADSP-2181/ADSP-2183

REV. 0

–23–

ADSP-2181

Parameter Min Max Unit

Memory Read

Timing Requirements:

RDD

RD Low to Data Valid 0.5t

– 9 + w ns

A0-A13, xMS to Data Valid 0.75t

– 10.5 + w ns

RDH

Data Hold from RD High 0 ns

Switching Characteristics:

RD Pulse Width 0.5t

– 5 + w ns

CRD

CLKOUT High to RD Low 0.25t

– 5 0.25t

+ 7 ns

ASR

A0-A13, xMS Setup before RD Low 0.25t

– 6 ns

RDA

A0-A13, xMS Hold after RD Deasserted 0.25t

– 3 ns

RWR

RD High to RD or WR Low 0.5t

– 5 ns

ADSP-2183

28.8 MHz

Parameter Min Max Unit

Memory Read

Timing Requirements:

RDD

RD Low to Data Valid 0.5t

– 9 + w ns

A0-A13, xMS to Data Valid 0.75t

– 12.5 + w ns

RDH

Data Hold from RD High 0 ns

Switching Characteristics:

RD Pulse Width 0.5t

– 5 + w ns

CRD

CLKOUT High to RD Low 0.25t

– 5 0.25t

+ 7 ns

ASR

A0-A13, xMS Setup before RD Low 0.25t

– 6 ns

RDA

A0-A13, xMS Hold after RD Deasserted 0.25t

– 3 ns

RWR

RD High to RD or WR Low 0.5t

– 5 ns

w = wait states x t

xMS = PMS, DMS, CMS, IOMS, BMS

CLKOUT

A0 – A13

RDA

RWR

ASR

CRD

RDD

RDH

DMS, PMS,

BMS, IOMS,

CMS

Figure 25. Memory Read

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