XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 397

• Manufacturer Part Number: XRT94L33IB-L
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L33IB-L

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 3.14 V ~ 3.47 V
• Package / Case: 504-LBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
The user can configure the Receive STS-3 TOH Processor block to increment the “Receive SONET Path –
REI-P Error Count” Register by the contents within the “REI-P” nibbles, within each incoming STS-1 SPE.
Therefore, in this mode, it is possible for the Receive SONET POH Processor block to increment this register
by as much as the value “8” per STS-1 SPE.
The user can accomplish this by setting Bit 1 (REI-P Error Type) within the “Receive SONET Path –
Control Register – Byte 0” to “0”, as illustrated below.
Receive SONET Path – Control Register – Byte 0 (Address = 0xN183)
2.3.3.3
Configuring the Receive SONET POH Processor block to increment the “Receive SONET Path – B3
Error Count” Register on a “per-SPE” basis.
The user can configure the Receive SONET POH Processor block to increment the “Receive SONET Path –
B3 Error Count” Register, by the value “1” for each STS-1 SPE that it determined to have a bit-error.
The user can accomplish this by setting Bit 0 (B3 Error Type), within the “Receive SONET Path – Control
Register – Byte 0” to “1”, as illustrated below.
Receive SONET Path – Control Register – Byte 0 (Address = 0xN183)
Note:
The Receive SONET POH Processor block has the responsibility for computing and verifying the Path BIP-8
(e.g., B3) byte within each incoming STS-1 SPE. When the Receive SONET POH Processor block executes
this function, it will do the following.
• It will read in the contents of a given “newly received” STS-1 SPE.
• It will compute the BIP-8 value over the SPE.
• This resulting BIP-8 value will be compared with the contents of the B3 byte, within the very next STS-1
SPE.
If the Receive SONET POH Processor block detects any B3 byte errors, then it will do the following.
B
B
R/O
R/O
a. It will generate the “Detection of B3 Error” Interrupt, by toggling the “INT*” output pin “LOW” and by
IT
IT
0
0
7
7
This the user implements this setting, then the corresponding Transmit SONET POH Processor block will set the
setting Bit 7 (Detection of B3 Byte Error Interrupt Status) to “1” as indicated below.
REI-P nibble value (within the G1 byte) to the number of erred SPE that have been detected. In this case, the
maximum value that the REI-P nibble (within an STS-1 SPE) will contain will be “1”.
PATH BIP-8 (B3) BYTE VERIFICATION
B
B
R/O
R/O
IT
IT
0
0
6
6
Unused
Unused
B
B
R/O
R/O
IT
IT
0
0
5
5
B
B
R/O
R/O
IT
IT
0
0
4
4
397
Check
Check
B
B
Stuff
Stuff
R/W
R/W
IT
IT
0
0
3
3
RDI-P
RDI-P
B
Type
B
Type
R/W
R/W
IT
IT
0
0
2
2
Error Type
Error Type
REI-P
REI-P
B
B
R/W
R/W
IT
IT
0
0
1
1
XRT94L33
B3 Error
B3 Error
Rev.1.2.0.
B
Type
B
Type
R/W
R/W
IT
IT
0
1
0
0