Analog Devices ADSP-21020 Specification Sheet page 15

Flags
Parameter
1
Timing Requirement:
t FLAG3-0 Setup before CLKIN High
SFI IN
t FLAG3-0 Hold after CLKIN High
HFI IN
t FLAG3-0 Delay from xRD, xWR Low
DWRFI IN
t FLAG3-0 Hold after xRD, xWR
HFIWR IN
Deasserted
Switching Characteristic:
t FLAG3-0 Delay from CLKIN High
DFO OUT
t FLAG3-0 Hold after CLKIN High
HFO OUT
t CLKIN High to FLAG3-0
DFOE
t CLKIN High to FLAG3-0
DFOD
NOTES
*DT = t – 50 ns
CK
1
Flag inputs meeting these setup and hold times will affect conditional operations in the next instruction cycle. See the Hardware Configuration chapter of the
ADSP-21020 User's Manual for additional flag servicing information.
x = PM or DM.
CLKIN
FLAG3-0
OUT
CLKIN
FLAG3-0
xRD, xWR
REV. C
K/B/T Grade K/B/T Grade B/T Grade
20 MHz
Min Max
19
0
12
0
24
5
Enable 1
OUT
Disable 24
OUT
t
DFOE
t
SFI
IN
t
DWRFI
FLAG INPUT
25 MHz 30 MHz
Min Max Min Max Min Max Min
16 14
0 0
8 5
0 0
24 24
5 5
1 1
24 24
t
DFO
t
DFO
t
HFO
FLAG OUTPUT
t
HFI
t
HFIWR
Figure 7. Flags
–15–
ADSP-21020
K Grade
33.3 MHz Frequency Dependency*
Max
13 19 + 5DT/16
0
3 12 + 7DT/16 ns
0
24
5
1
24
t
DFOD
Unit
ns
ns
ns
ns
ns
ns
ns