Cascading External 82C59A Interrupt Controllers - Intel 386 User Manual

Intel386™ EX
Processor
READY#
M/IO#
W/R#
D/C#
ADS#
LBA#
CLKOUT
CLK2
CAS0
CAS1
CAS2
Latch
INT x
INT y
BLE#
CS x #
CS y #
RD#
WR#
D7:0
Figure 9-19. Cascading External 82C59A Interrupt Controllers
PLD
READY#
INTA#
INTA#
and
READY#
State
Machine
External
External
CAS
Decode
INTERRUPT CONTROL UNIT
82C59As
CAS0
CAS1
CAS2
A0
INTA#
CS x #
INT
RD#
WR#
D7:0
CAS0
CAS1
CAS2
A0
INT
INTA#
CS y #
RD#
WR#
D7:0
A2857-01
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