ADSP-2104/ADSP-2109

–30–

REV. 0

TIMING PARAMETERS (ADSP-2104L/ADSP-2109L)

BUS REQUEST/GRANT

Frequency

13.824 MHz

Dependency

Parameter

Min

Max

Min

Max

Unit

Timing Requirement:

23.1

ns

BR Setup before CLKOUT Low

1

38.1

ns

Switching Characteristic:

CLKOUT High to DMS, PMS, BMS, RD, WR Disable

38.1

ns

DMS, PMS, BMS, RD, WR Disable to BG Low

0

0

ns

BG High to DMS, PMS, BMS, RD, WR Enable

0

0

ns

DMS, PMS, BMS, RD, WR Enable to CLKOUT High

8.1

ns

NOTES

requires a pulse width greater than 10 ns.

Note: BG is asserted in the cycle after BR is recognized. No external synchronization circuit is needed when BR is generated as an asynchronous signal.

Figure 27. Bus Request/Grant

CLKOUT

PMS, DMS

BMS, RD

WR

BR

BG

CLKOUT