ADSP-2166_15 Datasheet, PDF (23/39 Pages) Analog Devices – DSP Microcomputers with ROM

ADSP-216x
TIMING PARAMETERS (ADSP-2161/ADSP-2163/ADSP-2165)
INTERRUPTS AND FLAGS
Parameter
16.67 MHz
Min Max
20 MHz
Min Max
25 MHz
Min Max
Frequency Dependency
Min
Max
Unit
Timing Requirements:
t_IFS IRQx¹ or FI Setup Before
30
27.5
25
0.25t_CK + 15
ns
CLKOUT Low^{2, 3}
t_IFS IRQx¹ or FI Setup Before
33
30.5
28
0.25t_CK + 18
ns
CLKOUT Low^{2, 3}
t_IFH IRQx¹ or FI Hold After CLKOUT 15
12.5
10
0.25t_CK
ns
High^{2, 3}
Switching Characteristics:
t_FOH FO Hold After CLKOUT High
0
t_FOD FO Delay from CLKOUT High
15
0
0
0
15
12⁴
ns
15⁴
ns
NOTES
1_{IRQx = IRQ0, IRQ1, and IRQ2.}
2_{If IRQx and FI inputs meet tIFS and tIFH setup/hold requirements, they will be recognized during the current clock cycle; otherwise they will be recognized during the}
following cycle. (Refer to the “Interrupt Controller” section in Chapter 3, Program Control, of the ADSP-2100 Family User’s Manual, Third Edition for further
information on interrupt servicing.)
3_{Edge-sensitive interrupts require pulsewidths greater than 10 ns. Level-sensitive interrupts must be held low until serviced.}
4_{For 25 MHz only, the maximum frequency dependency for tFOD = 12 ns.}
CLKOUT
FLAG
OUTPUT(S)
IRQx
FI
t_FOD
t_FOH
t_IFH
t_IFS
Figure 22. Interrupts and Flags
REV. 0
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