ADSP-21020 查看數據表（PDF） - Analog Devices

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ADSP-21020

32/40-Bit IEEE Floating-Point DSP Microprocessor

Analog Devices 

ADSP-21020

Interrupts

K/B/T Grade K/B/T Grade B/T Grade K Grade

Parameter

20 MHz

25 MHz 30 MHz 33.3 MHz Frequency Dependency*

Min Max Min Max Min Max Min Max Min

Max

Unit

Timing Requirement:

tSIR IRQ3-0 Setup before CLKIN High 38

31

25

23

38 + 3DT/4

ns

tHIR IRQ3-0 Hold after CLKIN High 0

0

0

0

ns

tIPW IRQ3-0 Pulse Width

55

45

38

35

tCK + 5

ns

NOTE

*DT = tCK – 50 ns

Meeting setup and hold guarantees interrupts will be latched in that cycle. Meeting the pulse width is not necessary if the setup and hold is met. Likewise, meeting the

setup and hold is not necessary if the pulse width is met. See the Hardware Configuration chapter of the ADSP-21020 User’s Manual for interrupt servicing informa-

tion.

CLKIN

tSIR

tHIR

IRQ3-0

t IPW

Timer

Parameter

Switching Characteristic:

tDTEX CLKIN High to TIMEXP

NOTE

*DT = tCK – 50 ns

Figure 5. Interrupts

K/B/T Grade K/B/T Grade B/T Grade K Grade

20 MHz

25 MHz

30 MHz 33.3 MHz Frequency Dependency*

Min Max Min Max Min Max Min Max Min

Max

Unit

24

24

24

24

ns

CLKIN

TIMEXP

t DTEX

t DTEX

Figure 6. TIMEXP

–14–

REV. C

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