adsp-21020 Analog Devices, Inc., adsp-21020 Datasheet - Page 14

• Manufacturer Part Number: adsp-21020
• Description: 32/40-bit Ieee Floating-point Dsp Microprocessor
• Manufacturer: Analog Devices, Inc.

ADSP-21020
Interrupts
Timing Requirement:
t
t
t
NOTE
*DT = t
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
Timer
Parameter
Switching Characteristic:
t
NOTE
*DT = t
Parameter
SIR
HIR
IPW
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.
DTEX
IRQ3-0 Setup before CLKIN High 38
IRQ3-0 Hold after CLKIN High
IRQ3-0 Pulse Width
CK
CK
CLKIN High to TIMEXP
– 50 ns
– 50 ns
TIMEXP
CLKIN
K/B/T Grade K/B/T Grade
Min
IRQ3-0
CLKIN
K/B/T Grade K/B/T Grade B/T Grade
20 MHz
0
55
Min
20 MHz
t
DTEX
Max
24
Max
Figure 5. Interrupts
Min
Figure 6. TIMEXP
Min
31
0
45
25 MHz
25 MHz
Max
24
–14–
Max Min Max Min Max Min
t
SIR
Min Max Min Max
B/T Grade
t
IPW
25
0
38
30 MHz
30 MHz
24
t
HIR
23
0
35
33.3 MHz Frequency Dependency*
33.3 MHz Frequency Dependency*
K Grade
K Grade
t
DTEX
24
38 + 3DT/4
t
Min
CK
+ 5
Max
ns
Max
REV. C
Unit
ns
ns
Unit
ns