REV. D

ADSP-2181

–16–

Parameter

Min

Max

Unit

Bus Request/Grant

Timing Requirements:

ns

ns

Switching Characteristics:

CLKOUT High to

xMS,

ns

RD, WR Disable

xMS, RD, WR

Disable to

BG Low

0

ns

BG High to xMS,

RD, WR Enable

0

ns

xMS, RD, WR

Enable to CLKOUT High

ns

xMS, RD, WR

Disable to

0ns

BGH High to xMS,

0ns

NOTES

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

1

BR 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.

2

BGH 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

Figure 10. Bus Request–Bus Grant