cx29503 Mindspeed Technologies, cx29503 Datasheet - Page 253

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

CX29503 Data Sheet
0x522C—Receive Overhead Control Register
On the CX29503, the RXGAPCK signal is an output from the DS3/E3 block to the TSB block. This signal is
used to clock the payload data that is transferred on the RXDAT signal.
Default after reset:
Direction:
Modification:
RxStfDat
RxCjDat
AllOVHDat
Table 8-47
Table 8-47. Summary of RXGAPCK Options
29503-DSH-002-B
Reserved
RxStfDat
7
X
0
0
1
1
details RXGAPCK output behavior in different modes according to the listed bits settings.
Reserved
00(h)
Read/Write
Static
Received Stuff Opportunity bits in the Data steam—Set to enable presenting the Stuff
Opportunity bits in the data stream over the RXDAT signal in DS3-M13/M23 and E3-G.751
modes. When set, RXGAPCK is not gapped over the Stuff Opportunity bit positions. When
clear, the Stuff Opportunity bits are not extracted, i.e., RXGAPCK is gapped over their bit
positions. When the AllOVHDat bit in this register is set, this bit is ignored. In DS3-C Bit
Parity mode, this bit is ignored.
Received Justification Control bits in the Data stream—Set to enable presenting the
justification control bits in the data stream over the RXDAT signal in DS3-M13/M23 and E3-
G.751 modes. When set, RXGAPCK is not gapped over the Justification Control bit positions.
When clear, the Justification Control bits are not extracted, i.e., RXGAPCK is gapped over
their bit positions. When the AllOVHDat bit in this register is set, this bit is ignored. In DS3-C
Bit Parity mode, this bit is ignored.
All Overhead bits are in the Data stream—Set to enable presenting the complete frame in the
data stream over the RXDAT signal, i.e., RXGAPCK is a nominal clock (it is not gapped). This
bit is available in all framing modes. When this bit is set, it overrides the RxCjDat bit in this
register. When this bit is cleared, presenting the Justification Control bits on RXDAT
(RXGAPCK gapping over Cj bit positions) is determined by the RxCjDat bit in this register.
Other overhead bits are not presented on the RXDAT signal when this bit is cleared, i.e.,
RXGAPCK is gapped accordingly.
6
RxCjDat
X
0
1
0
1
Reserved
5
AllOVHDat
Mindspeed Technologies™
1
0
0
0
0
Reserved
Preliminary Information
4
Nominal
Tick on Payload bits only (not on Stuff Opportunity bits)
Ticks only on Payload bits and Justification Control bits (in DS3-
M13/M23 and E3-G.751)
Ticks only on Payload bits and Stuff Opportunity bits (in DS3-M13/
M23 and E3-G.751)
Ticks on Payload, Stuff Opportunity, and Justification Control bits
(in DS3-M13/M23 and E3-G.751)
Reserved
3
RXGAPCK Output Behavior
RxStfDat
2
RxCjDat
1
Register Description
AllOVHDat
0
8
-
123