dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 297
dsp56800e
Manufacturer Part Number
dsp56800e
Description
16-bit Digital Signal Controller Core
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.DSP56800E.pdf
(706 pages)
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Freescale Semiconductor
i = Interrupt Arbitration and Request
ii = Interrupt Instruction Word
n = Normal Instruction Word
Int Arbitr
(b) Interrupt Pipeline—Servicing an Interrupt Immediately After a Fast Interrupt Routine
Int Req
Stage
Pipe
OP2
EX2
AG
EX
P1
P2
ID
IF
Figure 10-7. Interrupting After Completing the Fastest Fast Interrupt Routine
(a) Instruction Flow—Fast Interrupt Routine Followed by Another Interrupt
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
Main
i
n1
n2
n3
n4
n5
n6
n1 — —
5
n1 —
6
n1
by the Arbiter
7
frtid
n3
n1
ii2
ii1
—
—
—
8
Instruction Pipeline
dly0
frtid
n2
n3
ii2
—
—
—
9
Instruction Cycle
dly1
dly0
frtid
10
n3
n2
n3
—
—
dly1
dly0 dly1
frtid
11
n4
n3
n2
—
—
i
dly0 dly1
frtid dly0 dly1
12
n5
n4
n3
n2
—
i
i
Jump Address
Pipeline During Interrupt Processing
13
n6
n5
n4
n3
n2
—
i
Second Interrupt Request
FRTID
JSR
Sampled by the Arbiter
dly0
dly1
14
n6
n5
n3
n2
ii0
—
—
15
n6
n3
n2
ii1
ii0
—
—
—
General Interrupt
Fast Interrupt
16
n3
n2
ii2
ii1
ii0
—
—
—
Level 0–2
Level 2
17
n3
ii2
ii1
ii0
—
—
—
•
18 19 20
ii2
ii1
ii0
—
—
—
•
•
ii2
ii1
ii0
—
—
•
•
•
ii2
ii1
ii0
—
•
•
•
•
10-17
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