
AC Electrical Characteristics
DSP56321 Technical Data, Rev. 11
Freescale Semiconductor
2-7
20 Delay from RD assertion to interrupt 
request deassertion for level sensitive 
fast interrupts
1, 6, 7
(WS + 3.25) 
×
 T
C
 – 
10.94
—
Note 7
—
Note 7
—
Note 7
—
Note 7
ns
21 Delay from WR assertion to interrupt 
request deassertion for level sensitive 
fast interrupts
1, 6, 7
SRAM WS = 3
SRAM WS 
≥
 4
(WS + 3) 
×
 T
C
 – 10.94
(WS + 2.5) 
×
 T
C
 – 10.94
—
—
Note 7
Note 7
—
—
Note 7
Note 7
—
—
Note 7
Note 7
—
—
Note 7
Note 7
ns
ns
24 Duration for IRQA assertion to recover 
from Stop state
8.0
—
8.0
—
8.0
—
8.0
—
ns
25 Delay from IRQA assertion to fetch of 
first instruction (when exiting Stop)
2, 3
DPLL is not active during Stop 
(PCTL Bit 1 = 0) and Stop delay is 
enabled (Operating Mode Register 
Bit 6 = 0) 
DPLL is not active during Stop 
(PCTL Bit 1 = 0) and Stop delay is 
not enabled (Operating Mode 
Register Bit 6 = 1) 
DPLL is active during Stop (PCTL 
Bit 1 = 1; Implies No Stop Delay) 
DPLT + (128K 
×
 T
C
)
DPLT + (23.75 ± 0.5) 
×
T
C
(10.0 
± 
1.75) 
×
 T
C
662.2 
μ
s
6.9
41.25
209.9 
ms
188.8
58.8
662.2 
μ
s
6.9
37.5
209.9 
ms
188.8
53.3 
662.2 
μ
s
6.9
34.4
209.9 
ms
188.8
49.0
662.2 
μ
s
6.9
30.0
209.9 
ms
188.8
43.0
—
μ
s
ns
26 Duration of level sensitive IRQA 
assertion to ensure interrupt service 
(when exiting Stop)
2, 3
DPLL is not active during Stop 
(PCTL bit 1 = 0) and Stop delay is 
enabled (Operating Mode Register 
Bit 6 = 0)
DPLL is not active during Stop 
(PCTL bit 1 = 0) and Stop delay is 
not enabled (Operating Mode 
Register Bit 6 = 1) 
DPLL is active during Stop ((PCTL 
bit 1 = 0; implies no Stop delay) 
DPLT + (128 K 
×
 T
C
)
DPLT + (20.5 
± 
0.5) 
×
 T
C
5.5 
×
 T
C
805.4
150.1
27.5
—
—
—
805.4
150.1
25
—
—
—
805.4
150.1
22.9
—
—
—
805.4
150.1
20.0
—
—
—
μ
s
μ
s
ns
27 Interrupt Request Rate
HI08, ESSI, SCI, Timer
DMA
IRQ, NMI (edge trigger)
IRQ, NMI (level trigger)
12T
C
8T
C
8T
C
12T
C
—
—
—
—
60.0
40.0
40.0
60.0
—
—
—
—
54.6
36.4
36.4
54.6
—
—
—
—
50.0
33.4
33.4
50.0
—
—
—
—
43.7
29.2
29.2
43.7
ns
ns
ns
ns
28 DMA Request Rate
Data read from HI08, ESSI, SCI
Data write to HI08, ESSI, SCI
Timer
IRQ, NMI (edge trigger)
6T
C
7T
C
2T
C
3T
C
—
—
—
—
30.0
35.0
10.0
15.0
—
—
—
—
27.3
31.9
9.1
13.7
—
—
—
—
25.0
29.2
8.3
12.5
—
—
—
—
21.84
25.48
7.28
10.92
ns
ns
ns
ns
29 Delay from IRQA, IRQB, IRQC, IRQD, 
NMI assertion to external memory 
(DMA source) access address out 
valid
4.25 
×
 T
C 
+ 2.0
23.25
—
21.34
—
19.72
—
17.45
—
ns
Table 2-7.     
Reset, Stop, Mode Select, and Interrupt Timing
5
  (CONTINUED)
No.
Characteristics
Expression
200 MHz
220 MHz
240 MHz
275 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max