
REV. B
ADMC401
–6–
Parameter
Min
Max
Unit
Interrupts and Flags
Timing Requirements:
t
IFS
IRQx or FI Setup before CLKOUT Low1, 2, 3
0.25t
CK + 15
ns
t
IFH
IRQx or FI Hold after CLKOUT High1, 2, 3
0.25t
CK
ns
Switching Characteristics:
t
FOH
Flag Output Hold after CLKOUT Low
4
0.5t
CK – 7
ns
t
FOD
Flag Output Delay from CLKOUT Low
4
0.5t
CK + 5
ns
NOTES
1If
IRQx and FI inputs meet t
IFS and tIFH setup/hold requirements, they will be recognized during the current clock cycle; otherwise the signals will be recognized on
the following cycle. (Refer to “Interrupt Controller Operation” in the Program Control chapter of the ADSP-2100 Family User’s Manual, Third Edition for further
information on interrupt servicing.)
2Edge-sensitive interrupts require pulsewidths greater than 10 ns; level-sensitive interrupts must be held low until serviced.
3
IRQx = IRQ0 and IRQ1.
4Flag Output = FL1 and FO.
CLKOUT
FLAG
OUTPUTS
IRQx
FI
tFOH
tIFH
tIFS
tFOD
Figure 2. Interrupts and Flags