ADSP-21MOD870 查看數據表（PDF） - Analog Devices

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ADSP-21MOD870

Internet Gateway Processor

Analog Devices 

ADSP-21mod870

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

tSDB

tSE

tSEC

tSDBH

tSEH

CLKOUT High to xMS, RD, WR Disable

xMS, RD, WR Disable to BG Low

BG High to xMS, RD, WR Enable

xMS, RD, WR Enable to CLKOUT High

xMS, RD, WR Disable to BGH Low2

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 – 4

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-2100 Family User’s Manual, Third Edition, for BR/BG cycle relationships.

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

CLKOUT

BR

CLKOUT

PMS, DMS

BMS, RD

WR

BG

BGH

tBH

tBS

tSD

tSEC

tSDB

tSE

tSDBH

tSEH

Figure 23. Bus Request–Bus Grant

REV. 0

–21–

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