Datasheet

ADSP-BF561
External Port Bus Request and Grant Cycle Timing
Table 21 and Figure 13 describe external port bus request and
bus grant operations.
Table 21. External Port Bus Request and Grant Cycle Timing
Parameter
1, 2
Min Max Unit
Timing Requirements
t
BS
BR Asserted to CLKOUT High Setup
t
BH
CLKOUT High to BR Deasserted Hold Time
Switching Characteristics
t
SD
CLKOUT Low to AMSx, Address and ARE/AWE Disable
t
SE
CLKOUT Low to AMSx, Address and ARE/AWE Enable
t
DBG
CLKOUT High to BG Asserted Setup
t
EBG
CLKOUT High to BG Deasserted Hold Time
t
DBH
CLKOUT High to BGH Asserted Setup
t
EBH
CLKOUT High to BGH Deasserted Hold Time
4.6
0.0
4.5
4.5
3.6
3.6
3.6
3.6
ns
ns
ns
ns
ns
ns
ns
ns
1
These are preliminary timing parameters that are based on worst-case operating conditions.
2
The pad loads for these timing parameters are 20 pF.
ADDR19-1
AMSx
CLKOUT
BG
AWE
BGH
ARE
BR
ABE1-0
t
BH
t
BS
t
SD
t
SE
t
SD
t
SD
t
SE
t
SE
t
EBG
t
DBG
t
EBH
t
DBH
Figure 13. External Port Bus Request and Grant Cycle Timing
Rev. E | Page 27 of 64 | September 2009