Analog Devices ADSP-2181, ADSP-2183 manual Parameter Min Max Unit Interrupts and Flag

ADSP-2181/ADSP-2183

ADSP-2181

Parameter			Min	Max	Unit
Interrupts and Flag
Timing Requirements:
tIFS		, FI, or PFx Setup before CLKOUT Low1, 2, 3, 4	0.25tCK + 15		ns
	IRQx
tIFH	IRQx	, FI, or PFx Hold after CLKOUT High1, 2, 3, 4	0.25tCK		ns
Switching Characteristics:
tFOH	Flag Output Hold after CLKOUT Low5		0.5tCK – 7		ns
tFOD	Flag Output Delay from CLKOUT Low5			0.25tCK + 5	ns

ADSP-2183

			28.8 MHz
Parameter			Min	Max	Unit
Interrupts and Flag
Timing Requirements:
tIFS		, FI, or PFx Setup before CLKOUT Low1, 2, 3, 4	0.25tCK + 15		ns
	IRQx
tIFH	IRQx	, FI, or PFx Hold after CLKOUT High1, 2, 3, 4	0.25tCK		ns
Switching Characteristics:
tFOH	Flag Output Hold after CLKOUT Low5		0.5tCK – 7		ns
tFOD	Flag Output Delay from CLKOUT Low5			0.25tCK + 6	ns

NOTES

1If 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.)

2Edge-sensitive interrupts require pulse widths greater than 10 ns; level-sensitive interrupts must be held low until serviced.

3IRQx = IRQ0, IRQ1, IRQ2, IRQL0, IRQL1, IRQE. 4PFx = PF0, PF1, PF2, PF3, PF4, PF5, PF6, PF7.

5Flag outputs = PFx, FL0, FL1, FL2, Flag_out4.

CLKOUT

FLAG

OUTPUTS

IRQx

FI

PFx

tFOD

tFOH

tIFH

tIFS

Figure 23. Interrupts and Flags

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