XRT94L33_06 Datasheet, PDF (322/465 Pages) Exar Corporation – 3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET

XRT94L33
Rev.1.2.0.
xr
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
2.2.9.5.8 SUPPORT/HANDLING OF THE SECTION DCC (D1, D2 AND D3) BYTES
2.2.9.5.9 SUPPORT/HANDLING OF THE K1/K2 BYTES
The Transmit STS-3c TOH Processor block permits the user to control the value of the K1 and K2 bytes,
which are to be transmitted via the “outbound” STS-3c data-stream, by either or the following options.
• Setting and controlling the K1, K2 bytes via software
• Setting and controlling the K1, K2 bytes via the “TxPOH Input Port”
The details and instructions for using either of these features are presented below.
2.2.9.5.9.1 Setting and Controlling the outbound K1, K2 bytes via Software
The Transmit STS-3c TOH Processor block permits the user to specify the contents of the K1 and K2 bytes
within the outbound STS-3c data-stream via software command.
The user can configure the Transmit STS-3c TOH Processor block to accomplish this by performing the
following steps.
STEP 1 – Write the value “1” into Bit 1 (K1K2 Method) within the “Transmit STS-3c Transport – SONET
Transmit Control Register – Byte 1, as depicted below.
Transmit STS-3Transport – SONET Transmit Control Register – Byte 1 (Address = 0x1902)
BIT 7
BIT 6
Reserved
R/O
R/O
0
0
BIT 5
E2 Insert
Method
R/W
X
BIT 4
E1 Insert
Method
R/W
X
BIT 3
F1 Insert
Method
R/W
X
BIT 2
S1 Insert
Method
R/W
X
BIT 1
K1K2 Insert
Method
R/W
1
BIT 0
M0M1 Insert
Method[1]
R/W
X
The step configures the Transmit STS-3c TOH Processor block to read out the contents of the “Transmit
STS-3c Transport – K1K2 (APS) Value Registers (Bytes 0 and 1), and load these values into the K1 and K2
byte positions within each outbound STS-3c data-stream.
STEP 2 – Write the desired byte values (for the outbound K1 and K2 bytes) into the “Transmit STS-3c
Transport – K1K2 (APS) Value Registers – (Bytes 0 and 1).
The bit-format for these two registers is presented below.
Transmit STS-3 Transport – K1K2 (APS) Value Register – Byte 1 (Address = 0x192E)
BIT 7
R/W
0
BIT 6
R/W
0
BIT 5
R/W
0
BIT 4
BIT 3
Transmit_K2_Byte_Value[7:0]
R/W
R/W
0
0
BIT 2
R/W
0
BIT 1
R/W
0
BIT 0
R/W
0
Transmit STS-3 Transport – K1K2 (APS) Value Register – Byte 1 (Address = 0x192F)
BIT 7
R/W
0
BIT 6
R/W
0
BIT 5
R/W
0
BIT 4
BIT 3
Transmit_K1_Byte_Value[7:0]
R/W
R/W
0
0
BIT 2
R/W
0
BIT 1
R/W
0
BIT 0
R/W
0
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