xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 209

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
STEP 1 – Read out the contents of both the Operation Block Interrupt Status Register – Byte 1 and
Byte 0. The bit-format of these two registers is presented below.
Operation Block Interrupt Status Register – Byte 1 (Address = 0x0012)
Operation Block Interrupt Status Register – Byte 0 (Address = 0x0013)
Note:
STEP 2 – After the Microprocessor has determined that the Transmit ATM Cell Processor block is the
“Interrupting” Functional block, within the XRT94L33, it must now identify which of the four channels
has generated this interrupt.
The Microprocessor can accomplish this by reading out the contents of the “Operation Channel Interrupt
Indicator – Transmit ATM Cell Processor block. The bit-format of the “Operation Channel Interrupt Indicator –
Transmit ATM Cell Processor Block” is presented below.
Operation Channel Interrupt Indicator – Transmit ATM Cell Processor Block (Address = 0x0122)
This register permits the user to identify which of the four Transmit ATM Cell Processor blocks within the
XRT94L33 are generating this particular interrupt request.
Op Control
Processor
ATM Cell
B
Interrupt
Interrupt
Receive
R/O
Status
Status
IT
Block
Block
B
B
0
R/O
R/O
IT
IT
7
0
0
7
7
If the Transmit ATM Cell Processor block is the source of the interrupt, then Bit 3 (Transmit ATM Cell Processor
Block Interrupt Status), within the “Operation Block Interrupt Status Register – Byte 0” will be set to “1”, as
depicted above.
B
R/O
IT
0
STS-3 TOH
6
Unused
Receive
Interrupt
Status
Block
B
B
R/O
R/O
IT
0
IT
0
B
6
6
R/O
IT
0
5
SONET/VC-3
POH Block
B
Interrupt
Receive
R/O
B
Status
R/O
IT
B
0
IT
R/O
0
IT
0
4
5
5
Block - Channel
Indication Status
Cell Processor
Transmit ATM
3 Interrupt
Processor
B
B
R/O
Interrupt
Receive
R/O
Status
IT
0
Block
IT
B
0
PPP
R/O
4
IT
0
3
4
209
Unused
Indication Status
Block - Channel
Processor
B
Cell Processor
ATM Cell
Transmit ATM
R/O
Transmit
Interrupt
IT
Status
0
Block
2 Interrupt
B
R/O
3
IT
1
B
R/O
3
IT
0
2
B
R/O
B
IT
0
R/O
IT
0
2
Indication Status
Block - Channel
Cell Processor
2
Transmit ATM
1 Interrupt
Unused
B
R/O
IT
0
1
B
B
R/O
R/O
IT
0
IT
0
1
1
Block Channel 0
Cell Processor
Transmit ATM
XRT94L33
Indication
Interrupt
Status
Processor
Transmit
B
Interrupt
R/O
Status
Rev.1.2.0.
Block
IT
B
0
B
PPP
R/O
R/O
IT
IT
0
0
0
0
0