Initialization Control Word - Advanced Micro Computers Am96/4116A User Manual

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-
! 01
DO
~
1
I
1
I
1 = ICW4 Required
o
= ICW4 Not Required
1 = Single 825A
o
= Multiple 8259A
Call Address Interval
1 = 4 Don't Care
o
=
8 For 16-Bit lAP
1 = Level Triggering
o
=
Edge Triggering
Don't Cares for 16·Bit lAP
l 01 DO
~~
- . . -
L
A10 A9 A8 INPUT
0 0 0 0
0 0
1 1
0
1
0
2
0
1 1
3
1 0 0
4
1 0 1 5
1 1 0 6
1 1 1 7
01 DO
I
AEOI
I
1
I
Must be '1' For 16-Bit lAP
1 = Automatic End of
Interrupt
0= Normal EOI
1
=
Special Fully Nested
Mode
o
=
Normal Nested Mode
O~
Not used
by Am961
4116,03
Must = 0
Vector Address Bits includes
A8-A10. which are inserted by
8259A for low-order address
(8,·bits),
---...,.---
, . . --L -.
A 1 07 06 05
D4
03
~
X
[=:!~=----'-L-TI-M---r--F
A 1 07 06 05
D4
03
~ = r
0 o=D'-F-N-M ........
-O-~-O·
~ 00 ~ ~ D4 00 ~
I
1
G~
A14
~A12 LA~
I/O "OCR:
FFC8H
ICW1
ICW2
I/O "OCR:
FFC"H
ICW4
I/O ADDR:
FFC"H
Figure 3-9.
Initialization Control Word (ICW) Formats
3-13