dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 143

• Manufacturer Part Number: dsp56000
• Description: 24-bit Digital Signal Processor Family Manual
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
i
ii
II = ILLEGAL INSTRUCTION
n = NORMAL INSTRUCTION WORD
INTERRUPT CONTROL CYCLE 1
INTERRUPT CONTROL CYCLE 2
FETCH
DECODE
EXECUTE
INSTRUCTION CYCLE COUNT
= INTERRUPT
= INTERRUPT INSTRUCTION WORD
Figure 7-4 Illegal Instruction Interrupt Serviced by a Fast Interrupt
EXCEPTION PROCESSING STATE (INTERRUPT PROCESSING)
INFINITE
LOOP
Freescale Semiconductor, Inc.
(a) Instruction Fetches from Memory
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PROGRAM
NO FETCH
NO FETCH
FETCHES
II (NOP)
1
MAIN
(b) Program Controller Pipeline
n6
n1
2
PROCESSING STATES
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n2
n1
3
n3
n2
n1
4
n4
n3
n2
5
ILLEGAL INSTRUCTION INTERRUPT
RECOGNIZED AS PENDING
n5
n4
n3
6
n6
n4
II
7
NOP
—
—
8
i
SERVICE ROUTINE
FAST INTERRUPT
—
—
—
9
i
ILLEGAL INSTRUCTION INTERRUPT
FETCHES
RECOGNIZED AS PENDING
10
ii1
—
—
I1
I2
11
ii2
—
i i 1
n5
12
ii2
ii1
13
ii2
II
NOP
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