XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 247

• 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
• Afterwards, the “external circuit” should serially place the remaining seven bits (of the Z3 byte) onto the
“TxPOH_n” input pin, upon each of the next seven falling edges of “TxPOHClk_n”.
• The “external circuit” should then revert back to continuously sampling the states of the “TxPOHEnable_n”
and “TxPOHFrame_n” output pins and repeat the above-mentioned process.
2.2.7.3.9
The Transmit STS-3c 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.
2.2.7.3.9.1
The Transmit STS-3c POH Processor block permits the user to specify the contents of the Z4 byte, within the
“outbound” STS-3c SPE via software command.
The user can configure the Transmit STS-3c 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 STS-3c Path – SONET
Control Register – Byte 1”, as depicted below.
Transmit STS-3c Path – SONET Control Register – Byte 1 (Address = 0x1982)
This step configures the Transmit STS-3c POH Processor block to read out the contents of the “Transmit
STS-3c Path – Transmit Z4 Byte Value” register; and load this value into the Z4 byte position within each
“outbound” STS-3c SPE.
STEP 2 – Write the desired byte value (for the outbound H4 byte) into the “Transmit STS-3c Path –
Transmit Z4 Byte Value” register.
The bit-format of this register is presented below.
Transmit STS-3c Path – Transmit Z4 Byte Value Register (Address = 0x19AF)
2.2.7.3.9.2
The Transmit STS-3c POH Processor block permits the user to specify the contents of the Z4 byte, within the
“outbound” STS-3c SPE, via data applied to the “TxPOH_n” input pin.
The user can configure the Transmit STS-3c POH Processor block to accomplish this by performing the
following steps.
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
Setting and Controlling the Outbound Z4 Byte via the “TxPOH_n Input Port”
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
247
Z5 Insertion
B
Type
B
R/W
R/W
IT
IT
0
0
3
3
Z4 Insertion
Type
B
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