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XRT7250 Datasheet(PDF) 304 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) 304 Page - Exar Corporation

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XRT7250
DS3/E3 FRAMER IC
REV. 1.1.1
285
The user can configure the Receive E3 LIU Interface
block to operate in either the Unipolar or the Bipolar
Mode by writing the appropriate data to the I/O Con-
trol Register, as depicted below.
Table 59 relates the value of this bit-field to the Re-
ceive E3 LIU Interface Input Mode.
NOTES:
1. The default condition is the Bipolar Mode.
2. This selection also effects the Transmit E3 Framer
Line Interface Output Mode
5.3.1.2
Bipolar Decoding
If the Receive E3 LIU Interface block is operating in
the Bipolar Mode, then it will receive the E3 data puls-
es via both the RxPOS, RxNEG, and the RxLineClk
input pins. Figure 130 presents a circuit diagram il-
lustrating how the Receive E3 LIU Interface block in-
terfaces to the Line Interface Unit while the Framer is
operating in Bipolar mode. The Receive E3 LIU Inter-
face block can be configured to decode either the AMI
or HDB3 line codes.
FIGURE 129. BEHAVIOR OF THE RXPOS, RXNEG AND RXLINECLK SIGNALS DURING DATA RECEPTION OF UNIPO-
LAR
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
1
010
0
000
TABLE 59: 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 E3 LIU INTERFACE INPUT MODE
0
.Bipolar Mode (Dual Rail): AMI or HDB3 Line Codes are Transmitted and Received.
1
Unipolar Mode (Single Rail) Mode of transmission and reception of E3 data is selected.



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