dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 299

• Manufacturer Part Number: dsp56800e
• Description: 16-bit Digital Signal Controller Core
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
i = Interrupt Arbitration and Request
ii = Interrupt Instruction Word
n = Normal Instruction Word
Int Arbitr
Int Req
(b) Interrupt Pipeline—Servicing an Interrupt Immediately After a Fast Interrupt Routine
Stage
Pipe
OP2
EX2
AG
EX
P1
P2
IF
ID
(a) Instruction Flow—Fast Interrupt Routine Followed by Another Interrupt
Figure 10-8. Interruption by Level 3 Interrupt During FRTID Execution
n1 n2 n3 n4 ii0 ii1 ii2
1
n1 n2 n3 n4 ii0 ii1
2
n1 n2 n3 n4 ii0
3
i
Program
n1 — — —
Level 2 Fast Interrupt Request Sampled
4
i
Main
n1
n2
n3
n4
n5
n6
n1 — —
5
n1 —
6
n1
7
by the Arbiter
n1
ii3
ii2
ii1
ii0
—
—
—
8
Instruction Pipeline
ii3
ii4
ii2
ii1
ii0
—
—
—
9
Instruction Cycle
frtid
10
II4
ii5
ii3
ii1
ii0
—
—
dly0 dly1
frtid
11
n2
II5
II4
ii1
ii0
—
i
dly0 dly1
frtid dly0 dly1
12
n2
n3
II5
ii1
ii0
i
Jump Address
frtid dly0 dly1
13
n3
ii0
n2
—
ii1
Pipeline During Interrupt Processing
(Level 3) Sampled by the Arbiter
FRTID
JSR
dly0
dly1
ii0
ii1
Second Interrupt Request
frtid dly0 dly1
14
n3
ii1
ii0
—
—
15
ii2
ii1
ii0
—
—
—
General Interrupt
Fast Interrupt
Level 2
Level 3
16
ii2
ii1
—
—
—
—
•
(Wait 1 Cycle)
17
ii2
ii0
—
—
—
—
•
•
18
ii1
ii0
—
—
—
•
•
•
19 20
ii2
ii1
ii0
—
—
•
•
•
ii2
ii1
ii0
—
•
•
•
•
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