cx29503 Mindspeed Technologies, cx29503 Datasheet - Page 199

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

CX29503 Data Sheet
TBOP_LEN[1:0]
TBOP_MODE[1:0]
29503-DSH-002-B
TBOP Message Length—Selects the number of repeated 16-bit patterns sent as a single
message when a TBOP [addr: 0A1] code word is written. Another message, with the same or
different code word value, can be written to TBOP as soon as the prior message start is
acknowledged via activation of the TBOP interrupt [ISR2; addr: 009]. If no new message is
written, the FDL channel returns to the TDL1 output control upon completion of message
transmission. The processor changes TBOP_LEN to end transmission of a continuously
repeating message.
Transmit BOP Mode—Enables the BOP transmitter and establishes priority of TBOP
[addr: 0A1] output in relation to TDL1 [addr: 0AD] output. When TBOP messages are given
output priority, any write to TBOP aborts TDL1 output within the next 8 FDL bit times and
then suspends TDL1 data output until TBOP has completed transmission. The processor can
check TMSG1 status [addr: 0AE] before writing TBOP to determine if TDL1 output is idle.
TDL1 buffer can be written while TBOP is granted priority.
When TDL1 messages are given output priority, TBOP output is suspended when the TDL1
buffer becomes non-empty. In case of multiple pending messages, PRM messages have highest
priority, then BOP, and then TDL1. Furthermore, TBOP is forced to wait until the TDL1 buffer
is empty and the TDL1 output is in the idle state before TBOP output is granted priority. If
TBOP_LEN is continuous or controlled by TMYEL, and TDL1/PRM message output is
pending, then TBOP will be suspended at the next 16-bit pattern boundary. TDL1 priority is
used to transmit PRM, DS1 Idle (ISID), or optional path maintenance (PID, TSID) messages
separated by ESF Yellow Alarm code words as defined in Annex D of ANSI T1.403.
Table 8-31. TBOP Message Length
Table 8-32. TBOP Mode Description
TBOP_LEN
TBOP_MODE
00
01
10
11
0X
10
11
Mindspeed Technologies™
Continuous
Repeated
Patterns
Preliminary Information
10
25
1
Disabled: TBOP writes are ignored
TBOP output priority
TDL1 output priority
Length (ms)
Continuous
Message
100
40
4
Single message sends 16 FDL bits
Minimum command, response length
Preferred command
Required for ESF yellow alarm
Mode Description
Notes
Register Description
8
-
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