ADSP-2173 datasheet(32/52 Pages) AD

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REV. A

–32–

ADSP-2171/ADSP-2172/ADSP-2173

ADSP-2173 TIMING PARAMETERS

GENERAL NOTES

Use the exact timing information given. Do not attempt to de-

rive parameters from the addition or subtraction of others.

While addition or subtraction would yield meaningful results for

an individual device, the values given in this data sheet reflect

statistical variations and worst cases. Consequently, you cannot

meaningfully add up parameters to derive longer times.

TIMING NOTES

Switching characteristics specify how the processor changes its

signals. You have no control over this timing; it is dependent on

the internal design. Timing requirements apply to signals that

are controlled outside the processor, such as the data input for a

read operation.

Timing requirements guarantee that the processor operates cor-

rectly with another device. Switching characteristics tell you

what the device will do under a given circumstance. Also, use

the switching characteristics to ensure any timing requirement

of a device connected to the processor (such as memory) is

satisfied.

MEMORY REQUIREMENTS

This chart links common memory device specification names

and ADSP-2173 timing parameters for your convenience.

Common

Parameter

Memory Device

Name

Function

Specification Name

tASW

A0-A13, DMS, PMS

Address Setup to

Setup before WR Low

Write Start

tAW

A0-A13, DMS, PMS

Setup Address Setup

before WR Deasserted

to Write End

tWRA

A0-A13, DMS, PMS

Address Hold Time

Hold after WR Deasserted

tDW

Data Setup before WR High Data Setup Time

tDH

Data Hold after WR High

Data Hold Time

tRDD

Low to Data Valid

to Data Valid

tAA

A0-A13, DMS, PMS,

Address Access Time

BMS

to Data Valid

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