XRT94L33_07 Datasheet, PDF (730/862 Pages) Exar Corporation – 3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER - ATM REGISTERS

XRT94L33
333---CCCHHHAAANNNNNNEEELLL DDDSSS333///EEE333///SSSTTTSSS---111 TTTOOO SSSTTTSSS---333///SSSTTTMMM---111 MMMAAAPPPPPPEEERRR ––– AAATTTMMM RRREEEGGGIIISSSTTTEEERRRSSS
1.12.7 TRANSMIT E3, ITU-T G.751 RELATED REGISTERS
Rev222...000...000
Table 629: TxE3 Configuration Register – G.751 (Address Location= 0xN330)
BIT 7
TxBIP-4
Enable
R/W
0
BIT 6
BIT 5
TxASrcSel[1:0]
R/W
R/W
0
0
BIT 4
BIT 3
TxNSrcSel[1:0]
R/W
R/W
0
0
BIT 2
BIT 1
TxAIS Enable TxLOS Enable
R/W
R/W
0
0
BIT 0
TxFAS
Source Sel
R/W
0
BIT NUMBER
7
6-5
NAME
TxBIP-4 Enable
TxASrcSel[1:0]
TYPE
R/W
R/W
DESCRIPTION
Transmit BIP-4 Enable:
This READ/WRITE bit-field permits the user to configure the Frame
Generator block to do the following:
• Compute the BIP-4 value over a given E3 frame.
• Insert this BIP-4 value into the last nibble-field within the very next E3
frame.
0 – Does not configure this option. In this case, the last nibble (of each
“outbound” E3 frame) will contain payload data.
1 – Configures the Frame Generator block to compute and insert the BIP-
4 value.
Transmit A Bit Source Select[1:0]:
These two READ/WRITE bit-fields permit the user to specify the source or
type of data that is being carried via the “A” bits, within each “outbound”
E3 data stream, as indicated below.
4–3
TxNSrcSel[1:0]
TxASrcSel[1:0] Resulting Source of A Bit
0
0
The “TxA” bit-field, within the “TxE3
Service Bit” register (Address
Location= 0xN335).
0
1
Not Valid - Do not use.
1
0
The “A” bit is sourced via the “Payload
Data Input Interface” block.
This is discussed in greater detail in
Section _.
1
1
The Companion Frame Synchronizer
block. In this case, the A bit will
transmit the FEBE indicator to the
remote terminal equipment. The A bit
will be set to “1” when the companion
Frame Synchronizer detects a BIP-4
error, and will be set to “0” when the
Frame Synchronizer detects un-erred
E3 frames.
R/W Transmit N Bit Source Select[1:0]:
These two READ/WRITE bit-fields permit the user to specify the source or
730