Motorola DSP96002 User Manual page 125

MC680 0
x PROCESSOR
Acknowledge Interrupt
1.Compare Interrupt Request Level
with Interrupt Mask.
—
2.Set R/ W to Read.
3.Set Function Code to CPU Space
and output IACK address.
4.Assert Address Strobe (
Data Strobe (
Acquire vector number
1.Latch Vector Number
— –
2.Deassert D S and
Start Interrupt Processing
Figure 7-21. 68K Interrupt Acknowledge Sequence
7.4.21.8 68K Interrupt Register Write
HIVR points to the slave IVR register (
ing instruction:
MOVE
7.4.21.9 X/Y/P Memory Write Procedure
The X/Y/P Memory Write procedure enables the host processor to write a data word D into an arbitrary ad-
dress A located in the DSP96002 memory space. The host processor must execute the following steps:
Verify that TX is empty (TXDE=1).
1.
2. Write A into the TX register using the host function "TX register write and X/Y/P Memory Write
Interrupt". If HRX is empty, the HI then transfers A to HRX automatically.
3. Verify that TX is empty (TXDE=1).
Write D into the TX register using the host function "TX register write and X/Y/P Memory Write
4.
Interrupt". This second write initiates the X/Y/P Memory Write interrupt.
MOTOROLA
— –
A S) and
— –
D S).
— –
A S
— –
H S=0,
R0,Y:HIVR
DSP96002 USER'S MANUAL
INTERRUPTING DEVICE - DSP
Request Interrupt
Place IVR contents on
Data Bus in response
to
— –
H
— –
H A=1, A5-A2=1100). The master executes the follow-
96002
Provide 68K Vector
— – — –
H A=0 & T S=0, when
R=0.
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