XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 287

• 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
2.2.8.3.9
The Transmit SONET POH Processor block permits the user to control the value of the Z4 byte by either of
the following options.
• Setting and controlling the “outbound” Z4 Byte via Software
• Setting and controlling the “outbound” Z4 Byte via the “TxPOH Input Port”
The details and instructions for using either or these features are presented below.
2.2.8.3.9.1
The Transmit SONET POH Processor block permits the user to specify the contents of the Z4 byte, within the
“outbound” STS-1 SPE via software command.
The user can configure the Transmit SONET POH Processor block to accomplish this by performing the
following steps.
STEP 1 – Write the value “0” into Bit 0 (Z4 Insertion Type) within the “Transmit SONET Path – SONET
Control Register – Byte 1”, as depicted below.
Transmit SONET Path – SONET Control Register – Byte 1 (Address = 0xN982)
This step configures the Transmit SONET POH Processor block to read out the contents of the “Transmit
SONET Path – Transmit Z4 Byte Value” register; and load this value into the Z4 byte position within each
“outbound” STS-1 SPE.
STEP 2 – Write the desired byte value (for the outbound H4 byte) into the “Transmit SONET Path –
Transmit Z4 Byte Value” register.
The bit-format of this register is presented below.
Transmit SONET Path – Transmit Z4 Byte Value Register (Address = 0xN9AF)
B
B
R/W
R/O
IT
IT
0
0
7
7
SUPPORT/HANDLING OF THE Z4 BYTE
Setting and Controlling the Outbound Z4 Byte via Software
B
B
R/W
R/O
IT
IT
0
0
6
6
Unused
B
B
R/W
R/O
IT
IT
0
0
5
5
Transmit_Z4_Byte_Value[7:0]
B
B
R/W
R/O
IT
IT
0
0
4
4
287
Z5 Insertion
Type
B
B
R/W
R/W
IT
IT
0
0
3
3
Z4 Insertion
B
Type
B
R/W
R/W
IT
IT
0
0
2
2
Z3 Insertion
B
Type
B
R/W
R/W
IT
IT
0
0
1
1
XRT94L33
H4 Insertion
Rev.1.2.0.
B
Type
B
R/W
R/W
IT
IT
0
0
0
0