ADSP-21MSP5859 Datasheet, PDF (26/40 Pages) Analog Devices – DSP Microcomputers

ADSP-21msp58/59
Parameter
Min
Max
Unit
Interrupts and Flags
Timing Requirement:
t_IFS
IRQx or FI Setup before CLKOUT Low^{1, 2, 3}
0.25t_CK + 15
ns
t_IFH
IRQx or FI Hold after CLKOUT High^{1, 2, 3}
0.25t_CK
ns
Switching Characteristics:
t_FOH
Flag Output Hold after CLKOUT Low⁴
t_FOD
Flag Output Delay from CLKOUT Low⁴
0.5t_CK – 7
ns
0.5t_CK + 5 ns
NOTES
1_{If IRQx and FI inputs meet tIFS 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 User’s Manual for further information on interrupt servicing.)
2_{Edge-sensitive interrupts require pulse widths greater than 10 ns; level-sensitive interrupts must be held low until serviced.}
3_{IRQx = IRQ0, IRQ1, and IRQ2.}
4_{Flag Output = FL0 and FO.}
CLKOUT
FLAG
OUTPUTS
IRQ
FI
x
t _{F OD}
t _{F OH}
t_{I FH}
t_{I FS}
Figure 16. Interrupts and Flags
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