xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 270

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

XRT94L33
Rev.1.2.0.
STEP 1 – Write the contents of this outbound “Path Trace Message” into the “Transmit Path Trace
Message” buffer.
As the user writes the contents of the “outbound” Path Trace Message” into the “Transmit Path Trace”
Message buffer they must make sure that the first byte of the message is written into Address location
0xNC00 (e.g., the very first address location of the “Transmit Path Trace Message” buffer).
STEP 2 – Specify the length of this “Path Trace Message” by writing the appropriate value into Bits 3
and 2 (J1 Message Length[1:0]) within the “Transmit SONET Path – Transmit J1 Control” Register; as
depicted below.
Transmit SONET Path – Transmit J1 Control” Register (Address = 0xN9BB)
The relationship between the contents of “J1_Message_Length[1:0]” and the corresponding length of the
“Path Trace Message” is presented below in Table _.
Table 16 The Relationship Between the contents of “J1_Message_Length[1:0]” and the corresponding
“Path Trace Message” Length
STEP 3 – Write the value “[0, 1]” into Bits 1 and 0 (J1_Type[1:0]) within the Transmit SONET Path –
Transmit J1 Control Register; as depicted below.
Transmit SONET Path – Transmit J1 Control” Register (Address = 0xN9BB)
This step configures the Transmit SONET POH Processor block to use the contents of the “Transmit Path
Trace Message” buffer as the source of the J1 byte, within each “outbound” STS-1 SPE.
J1_M
B
B
R/O
R/O
IT
IT
0
0
7
7
ESSAGE
00
01
10
11
_L
ENGTH
B
B
R/O
R/O
IT
IT
0
0
6
6
[1:0]
Unused
Unused
B
B
R/O
R/O
IT
IT
0
0
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
5
5
B
B
R/O
R/O
IT
IT
0
0
P
4
4
ATH
270
T
RACE
J1 Message Length[1:0]
J1 Message Length[1:0]
M
B
B
R/W
R/W
ESSAGE
IT
X
IT
X
3
3
16
64
64
1
L
ENGTH
B
B
R/W
R/W
IT
IT
X
(
X
BYTES
2
2
)
B
B
R/W
R/W
IT
X
IT
0
1
1
xr
J1 Type[1:0]
J1 Type[1:0]
B
B
R/W
R/W
IT
IT
X
1
0
0