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XRT7250 Datasheet(PDF) 203 Page - Exar Corporation

Part # XRT7250
Description  DS3/E3 FRAMER IC
PDF  463 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT7250 Datasheet(HTML) 203 Page - Exar Corporation

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XRT7250
DS3/E3 FRAMER IC
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REV. 1.1.1
184
The user can configure the Receive DS3 LIU Inter-
face block to operate in either the Unipolar or the Bi-
polar Mode by writing the appropriate data to the I/O
Control Register, as depicted below.
Table 35 relates the value of this bit-field to the Re-
ceive DS3 LIU Interface Input Mode.
NOTES:
1. The default condition is the Bipolar Mode.
2. This selection also effects the Transmit DS3 Framer
Line Interface Output Mode
4.3.1.2
Bipolar Decoding
If the Receive DS3 LIU Interface block is operating in
the Bipolar Mode, then it will receive the DS3 data
pulses via both the RxPOS, RxNEG, and the RxLi-
neClk input pins. Figure 75 presents a circuit dia-
gram illustrating how the Receive DS3 LIU Interface
block interfaces to the Line Interface Unit while the
Framer is operating in Bipolar mode. The Receive
DS3 LIU Interface block can be configured to decode
the incoming data from either the AMI or B3ZS line
codes.
FIGURE 74. BEHAVIOR OF THE RXPOS, RXNEG AND RXLINECLK SIGNALS DURING DATA RECEPTION OF UNIPOLAR
DATA
RxPOS
RxNEG
RxLineClk
Data
1
0
1
1
0
0
1
0
0
1
1
1
0
1
0
1
0
0
1
1
1
0
0
1
II/O CONTROL REGISTER (ADDRESS = 0X01)
BIT 7BIT 6BIT 5BIT 4
BIT 3BIT2BIT 1BIT 0
Disable TxLOC
LOC
Disable
RxLOC
AMI/ZeroSup*
Unipolar/
Bipolar*
TxLine CLK
Invert
RxLine CLK
Invert
Reframe
R/W
RO
R/W
R/W
R/W
R/W
R/W
R/W
10
10
0
000
TABLE 35: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 2 (TXLINECLK INV) WITHIN THE I/O CONTROL
REGISTER AND THE TXLINECLK CLOCK EDGE THAT TXPOS AND TXNEG ARE UPDATED ON
BIT 3RECEIVE DS3 LIU INTERFACE INPUT MODE
0
.Bipolar Mode (Dual Rail): AMI or B3ZS Line Codes are Transmitted and Received.
1
Unipolar Mode (Single Rail) Mode of transmission and reception of DS3 data is selected.



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