CD1865 Datasheet, PDF (104/150 Pages) Intel Corporation – Intelligent Eight-Channel Communications Controller

CD1865 — Intelligent Eight-Channel Communications Controller
Bit
Bits 7:6
ILV1
0
0
1
1
Description
.
ILV0
0
1
1
0
Context
Not in a service request context
CD1865 is in a Receive Service Request context
CD1865 is in a Transmit Service Request context
CD1865 is in a Modem Service Request context
An accepted interrupt acknowledge cycle pushes a new context onto the stack.
NOTE: The Status bits are positive true, and the * Pins are negative true. The ‘...int’ (internal) values are
local to the device being read, and the ‘...ext’ (external) values are the current external status on the
pin, that is, the result of the wire-OR’ed function.
.
Bits 5:4
RREQext
0
0
1
1
RREQint
0
1
1
0
Context
No interrupts
Invalid state
The location device requests a receive interrupt.
External interrupt pending. The local device has no receive
interrupts.
Bits 3:2
.
TREQext
0
0
1
1
TREQint
0
1
1
0
Context
No interrupts
Invalid state
The location device requests a transmit interrupt.
External interrupt pending. The local device has no transmit
interrupts.
Bits 1:0
.
MREQext
0
0
1
1
MREQint
0
1
1
0
Context
No interrupts
Invalid state
The location device requests a modem interrupt.
External interrupt pending. The local device has no modem
interrupts.
104
Datasheet