ADSP-2186 Ver la hoja de datos (PDF) - Analog Devices

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componentes Descripción

Fabricante

ADSP-2186

DSP Microcomputer

Analog Devices 

ADSP-2186

Parameter

Min

Max

Unit

Bus Request–Bus Grant

Timing Requirements:

tBH

BR Hold after CLKOUT High1

tBS

BR Setup before CLKOUT Low1

Switching Characteristics:

tSD

CLKOUT High to xMS, RD, WR Disable

tSDB

xMS, RD, WR Disable to BG Low

tSE

BG High to xMS, RD, WR Enable

tSEC

xMS, RD, WR Enable to CLKOUT High

tSDBH

xMS, RD, WR Disable to BGH Low2

tSEH

BGH High to xMS, RD, WR Enable2

0.25 tCK + 2

ns

0.25 tCK + 17

ns

0.25 tCK + 10

ns

0

ns

0

ns

0.25 tCK – 7

ns

0

ns

0

ns

NOTES

xMS = PMS, DMS, CMS, IOMS, BMS.

1BR is an asynchronous signal. If BR meets the setup/hold requirements, it will be recognized during the current clock cycle; otherwise the signal will be recognized on

the following cycle. Refer to the ADSP-218x DSP Hardware Reference, for BR/BG cycle relationships.

2BGH is asserted when the bus is granted and the processor requires control of the bus to continue.

tBH

CLKOUT

BR

tBS

CLKOUT

PMS, DMS

BMS, RD

WR

BG

BGH

tSD

tSEC

tSDB

tSE

tSDBH

tSEH

Figure 13. Bus Request–Bus Grant

–18–

REV. B

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