cx29503 Mindspeed Technologies, cx29503 Datasheet - Page 198

• Manufacturer Part Number: cx29503
• Description: Cx29503 Broadband Access Multiplexer Data Sheet
• Manufacturer: Mindspeed Technologies

Register Description
8.3.2.10
The BOP transceiver sends and receives BOP messages, including ESF Yellow Alarm messages. These
messages consist of repeated 16-bit patterns with an embedded 6-bit code word. The BOP message channel is
configured to operate over the same channel selected by the DL1 Time Slot Enable register
[DL1_TS; addr: 0A4]. The channel must be configured to operate over the FDL channel in order for BOP
messages to convey Priority, Command, and Response code word messages according to ANSI T1.403, Section
9.4.1. The precedence of transmitted BOP messages with respect to current DL1 transmit activity is
configurable [TBOP_MODE; addr: 0A0]. BOP messages can also be transmitted during E1 mode, although the
16-bit code word pattern has not currently been adopted as an E1 standard. The BOP message format is as
follows:
0xA0—Bit-Oriented Protocol (BOP) Transceiver
RBOP_START
RBOP_INTEG
RBOP_LEN[1:0]
8-68
RBOP_START
0xxxxxx011111111 (transmitted right to left)
[543210] 6-bit code word
7
RBOP_INTEG
BOP Receiver Enable—When active, the BOP receiver searches the FDL channel for data that
matches a 16-bit pattern in the form of 0xxxxxx011111111, where xxxxxx equals a 6-bit code
word. Otherwise, the BOP receiver is disabled.
RBOP Integration—Requires receipt of 2 identical consecutive 16-bit patterns (without errors
or gaps between patterns) to validate a single code word. In this case, an errored code word
does not increment the pattern count. RBOP integration must be enabled to meet code word
detection criteria while receiving the 1E-3 or 10
one to the number of successive 16-bit patterns needed to qualify the receipt of BOP message
(2 in a row counts as 1 pattern, 11 in a row counts as 10, and 26 in a row counts as 25).
RBOP Message Length—Selects the number of successive identical 16-bit patterns that are
needed to qualify receipt of a single BOP message and to update RBOP [addr: 0A2] with the
received code word. At this time, the RBOP interrupt [ISR1; addr: 00A] is also activated.
Successive patterns can be separated by any number of bits as long as they do not contain a
different valid code word.
6
Bit-Oriented Protocol (BOP) Registers
0 = disabled
1 = BOP receiver enable
0 = no integration
1 = RBOP integration
Table 8-30. RBOP Message Length
RBOP_LEN
RBOP_LEN[1]
00
01
10
11
5
Mindspeed Technologies™
RBOP_LEN[0]
Successive Patterns
Preliminary Information
4
Change
10
25
1
TBOP_LEN[1]
3
-3
bit error ratio. RBOP_INTEG adds at least
Single 16-bit pattern updates RBOP
Minimum command, response length
Preferred command, response length
RBOP updates on receipt of each new pattern
TBOP_LEN[0]
2
TBOP_MODE[1] TBOP_MODE[0]
Notes
1
CX29503 Data Sheet
29503-DSH-002-B
0