PM4314 QDSX
DATA SHEET
PMC-950857
ISSUE 5
QUAD T1/E1 LINE INTERFACE DEVICE
Registers 025H, 065H, 0A5H and 0E5H: XIBC Loopback Code
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
IBC7
IBC6
IBC5
IBC4
IBC3
IBC2
IBC1
IBC0
X
X
X
X
X
X
X
X
These registers contain the inband loopback code pattern to be transmitted.The
code is transmitted most significant bit ( IBC7) first, followed by IBC6 and so on.
The code, regardless of the length, must be aligned with the MSB always in the
IBC7 position (a 5-bit code would occupy the IBC7 through IBC2 bit positions).
To transmit a 3-bit or a 4-bit code pattern, the pattern must be paired to form a
double-sized code (the 3-bit code '011' would be written as the 6-bit code
'011011').
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
94
PMC [ PMC-SIERRA, INC ]
