CX28398 Conexant Systems, CX28398 Datasheet - Page 115

• Manufacturer Part Number: CX28398
• Description: (CX28394 - CX28398) Quad/x16/Octal?T1/E1/J1 Framers
• Manufacturer: Conexant Systems

CX28394/28395/28398
Quad/x16/Octal—T1/E1/J1 Framers
Figure 2-28. Interrupt Generation Block Diagram
100054E
INTR*
NOTE(S):
(1)
In CX28395, INTR1* is provided for Framers 1-8, and INTR2* is provided for Framers 9-16.
Register
MIR
the master interrupt enable register [MIE; addr 01E] and are routed to the master
interrupt register [MIR; addr 01D]. MIE provides a convenient location to enable
or disable interrupts for an entire framer. The serial done bit [SER_STAT;
addr 024] is gated with the serial interrupt enable bit [SER_CONFIG; addr 025]
to produce an additional interrupt request. Finally, MIR bits and the LIU serial
interface interrupt request are combined to generate a single interrupt request
signal on the INTR* pin.
The IRR bits from each framer are gated with the corresponding enable bit in
Using these registers, the microprocessor can process interrupts as follows:
Interrupt service routine
1.
2.
3.
4.
SER_DONE
SER_IER
Read MIR and SER_STAT registers to determine which framer or framers
caused the interrupt or whether LIU serial operation occurred.
For each interrupting framer, read IRR to determine which ISR contains
the interrupt event or events.
Read the ISR and mask the interrupt event bit using the corresponding IER
to determine which event or events caused the interrupt.
Enter the appropriate service routine.
Register
MIE
Framer 8
Framer 7
Conexant
Framer 6
Framer 5
Framer 4
Framer 3
Framer 2
Framer 1
Register
IRR
2.5 Microprocessor Interface
2.0 Circuit Description
Registers
Latches
ISR
IER
Events
2-57