
XRT86SH328
PRELIMINARY
124
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
read.
a. The Actual Receive Path Trace Message Buffer. The Actual Receive Path Trace Message Buffer contains the
contents of the most recently received (and accepted) Path Trace Message via the incoming STS-1/STS-3 data-stream.
b. The Expected Receive Path Trace Message Buffer. The Expected Receive Path Trace Message Buffer contains
the contents of the Path Trace Message that the user expects to receive. The contents of this particular buffer are
usually specified by the user.
`
0 - Executing a READ to the Receive J1 Trace Buffer, will return contents within the Valid Message buffer.
`
1 - Executing a READ to the Receive J1 Trace Buffer, will return contents within the Expected Message Buffer.
N
OTE
:
In the case of the Receive STS-1 POH Processor block, the Receive J1 Trace Buffer is located at Address
Location 0x0500 through 0x053F.
BIT 3 - Path Trace Message Accept Threshold
This READ/WRITE bit-field is used to select the number of consecutive times that the Receive STS-1 POH Processor
block must receive a given Receive Trace Message, before it is accepted and loaded into the Receive Path Trace
Message.
`
0 - The Receive STS-1 POH Processor block accepts the Path Trace Message after it has received it the third time
in succession.
`
1 - The Receive SONET POH Processor block accepts the incoming Path Trace Message after it has received in the
fifth time in succession.
BIT 2 - Path Trace Message Alignment Type
This READ/WRITE bit-field is used to specify have the Receive STS-1 POH Processor block will locate the boundary
of the J1 Trace Message.
`
0 - Message boundary is indicated by Line Feed.
`
1 - Message boundary is indicated by the presence of a 1 in the MSB of a the first byte (within the J1 Trace Message).
BIT [1:0] - Path Trace Message Length[1:0]
These READ/WRITE bit-fields are used to specify the length of the Receive Path Trace Message that the Receive STS-
1 POH Processor block will receive. The relationship between the content of these bit-fields and the corresponding
Receive Path Trace Message Length is presented below.
BIT [7:2] - Unused
BIT [1:0]
Current Pointer Value - MSB
These READ-ONLY bit-fields, along with that from the Receive STS-1 Path - Pointer Value - Byte 0 Register combine
to reflect the current value of the pointer that the Receive STS-1 POH Processor block is using to locate the SPE within
the incoming STS-1/STS-3 data stream.Note
These register bits comprise the Upper Byte value of the Pointer Value.
Receive Trace Path Message Length
MSG LENGTH[1:0]
R
ESULTING
P
ATH
T
RACE
M
ESSAGE
L
ENGTH
00
1 Byte
01
16 Bytes
10/11
64 Bytes
T
ABLE
152: R
ECEIVE
STS-1 P
ATH
- P
OINTER
V
ALUE
- B
YTE
1 (A
DDRESS
L
OCATION
= 0
X
02A6)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
Current_Pointer Val-
ueMSB[9:8]
R/O
R/O
R/O
R/O
R/O
R/O
R/O
R/O
0
0
0
0
0
0
0
0