XRT75R12D_06 Datasheet, PDF (69/134 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET

XRT75R12D
REV. 1.0.1 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
TABLE 24: CHANNEL LEVEL INTERRUPT STATUS REGISTER - CR225 (ADDRESS LOCATION = 0XE1)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Reserved Reserved Channel 11 Channel 10
Channel 9
Channel 8
Channel 7
Channel 6
Interrupt Status Interrupt Status Interrupt Status Interrupt Status Interrupt Status Interrupt Status
R/O
R/O
R/O
R/O
R/O
R/O
Register - CR225 (Address Location = 0xE1)
BIT
NUMBER
7, 6
NAME
Reserved
TYPE
DESCRIPTION
5
Channel 11 Interrupt Status R/O Channel n Interrupt Status Bit:
4
Channel 10 Interrupt Status
3
Channel 9 Interrupt Status
2
Channel 8 Interrupt Status
1
Channel 7 Interrupt Status
0
Channel 6 Interrupt Status
This READ-ONLY bit-field indicates whether the XRT75R12D has a
pending Channel n-related interrupt that is awaiting service. The last
six channels are serviced through this location and the other six at
address 0x61. These two registers are used by the Host to identify the
source channel of an active interrupt.
0 - Indicates that there is NO Channel n-related Interrupt awaiting ser-
vice.
1 - Indicates that there is at least one Channel n-related Interrupt
awaiting service. In this case, the user's Interrupt Service routine
should be written such that the Microprocessor will now proceed to
read out the contents of the Source Level Interrupt Status Register -
Channel n (Address Locations = 0xn2) to determine the exact source
of the interrupt request.
NOTE: Once this bit-field is set to "1", it will not be cleared back to "0"
until the user has read out the contents of the Source-Level
Interrupt Status Register bit, that corresponds to the interrupt
request channel.
BIT 7
R/O
0
TABLE 25: DEVICE/PART NUMBER REGISTER - CR110 (ADDRESS LOCATION = 0X6E)
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
Part Number ID Value
R/O
R/O
R/O
R/O
R/O
R/O
1
0
1
1
0
0
BIT 0
R/O
0
Register - CR110 (Address Location = 0x6E)
BIT NUMBER
NAME
7-0
Part Number ID
Value
TYPE
R/O
DEFAULT
VALUE
DESCRIPTION
0x58
Part Number ID Value:
This READ-ONLY register contains a unique value for the
XRT75R12D. This value will always be 0x58.
64