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XRT94L33
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
Rev.1.2.0.
313
Automatically set the J0 byte (within each outbound STS-3 Frame) to “0x01”
Set and control the outbound J0 byte via on-chip register
Set and control the outbound J0 byte via external input pin
Use the “Transmit Section Trace Message” buffer
The details and instructions for using either of these features are presented below.
2.2.9.5.5.1
Automatically setting the J0 byte (within each outbound STS-3 frame) to “0x01”
The XRT94L33 permits the user to configure each of the four (4) Transmit STS-3 TOH Processor blocks to
automatically set the contents of the J0 byte (within each outbound STS-3 frame) to “0x01”.
The user can accomplish this by writing the value “[0, 0]” into Bits 1 and 0 (J0 Type[1:0]) within the
appropriate “Transmit STS-3 Transport – Transmit J0 Byte Control” Register; as depicted below.
Transmit STS-3 Transport – Transmit J0 Byte Control Register (Address = 0x194F)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
J0 Message Length[1:0]
J0 Type[1:0]
R/O
R/W
0
X
0
Once the user executes this step, then the corresponding Transmit STS-3 TOH Processor block(s) will be
configured to automatically set the J0 byte (within each outbound STS-3 frame) to the value “0x01”.
2.2.9.5.5.2
Transmitting 16-byte/64-byte Section Trace Messages using the “Transmit Section
Trace Message” Buffer
The XRT94L33 contains a total of four (4) “Transmit Section Trace Message” Buffers (one for each “Transmit
STS-3 POH Processor block, within the device).
The address location of the “Transmit Section Trace
Message” buffer for each of the four Transmit STS-3 TOH Processor blocks is presented below.
Table 17: Address Locations of the Transmit Section Trace Message Buffers within the XRT94L33
TRANSMIT STS-3 TOH PROCESSOR BLOCK -
CHANNEL
ADDRESS LOCATION OF THE TRANSMIT SECTION TRACE MESSAGE
BUFFER
0
0x1B00 – 0x1B3F
1
0x2B00 – 0x2B3F
2
0x3B00 – 0x3B3F
3
0x4B00 – 0x4B3F
If the user wishes to use the “Section Trace Message” buffer as the means to load and transmit the “Section
Trace Message” to the remote STE, then they must execute the following steps.
STEP 1 – Write the contents of this outbound “Section Trace Message” into the “Transmit Section
Trace Message” Buffer.
As the user writes the contents of the “outbound” Section Trace Message” into the “Transmit Section Trace”
Message buffer they must make sure that the first byte of the message is written into Address location
0xNB00 (e.g., the very first address location of the “Transmit Section Trace Message” buffer).
STEP 2 – Specify the length of this “Section Trace Message” by writing the appropriate value into Bits
3 and 2 (J0 Message Length[1:0]) within the “Transmit STS-3 Transport – Transmit J0 Byte Control”
Register; as depicted below.