MT9072 Zarlink Semiconductor, Inc., MT9072 Datasheet - Page 93

• Manufacturer Part Number: MT9072
• Description: Octal T1-E1-J1 Framer
• Manufacturer: Zarlink Semiconductor, Inc.

Advance Information
14.1 Interrupt Status Register Overview
All 33 interrupt status registers are maskable with 33 corresponding interrupt mask registers. All interrupt status
registers and all interrupt mask registers are 16 bits, although all 16 bits are not always used. Unused status
bits may be either one or zero if read.
When an unmasked interrupt occurs, one or more bits of the 33 interrupt status registers will go high causing one
or more bits of the unmasked interrupt vector to go high. A high bit in the interrupt vector causes the output IRQ pin
to go low (if enabled by SPND, INTA control bits). After an interrupt status register is read, it is automatically
R
A
M
R
F
E
7
Interrupt Vector 2
Status Register Address 911
Mask Register Address 903
Interrupt Vector 2
Interrupt Vector 2
M
F
R
A
E
R
6
M
R
A
E
R
F
5
IRQ 2
M
R
A
E
R
F
4
Figure 9 - Interrupt Status Registers
4
M
R
A
E
R
F
3
4
4
Status Register Address 910
Mask Register Address 902
4
Interrupt Vector 1
M
R
A
E
R
F
2
Interrupt Vector 1
Interrupt Vector 1
4
4
4
M
R
A
R
F
E
1
4
4
Register
Register
HDLC
Status
HDLC
Status
Mask
033
043
4
4
4
INTA
Framer 0 Master LatchStatus
Rx Sync
Interrupt
Register
Rx Sync
Register
Status
Status
Mask
034
044
Registers 023 - 026
FRAMER 0
Register
Register
RX Line
Rx Line
Status
Status
Mask
035
045
IRQ 1
MT9072
SPND
ST-BUS
Analyser
Interrupt
Interrupt
Register
Elastic
Elastic
Status
Status
Store
Mask
036
046
IRQ
Pin
93