XRT83VSH28IB-F View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83VSH28IB-F' PDF : 74 Pages View PDF
PRELIMINARY
XRT83VSH28
REV. P1.0.0
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
FIGURE 17. SIMPLIFIED BLOCK DIAGRAM OF THE ATAOS FUNCTION
TAOS
TTIP
Tx
TRING
ATAOS
RLOS
3.5.2 QRSS Generation
The XRT83VSH28 can transmit a QRSS random sequence to a remote location from TTIP/TRING. The
polynomial is shown in Table 8.
TABLE 8: RANDOM BIT SEQUENCE POLYNOMIALS
RANDOM PATTERN
E1
QRSS
215 - 1
3.5.3 Arbitrary Pulse Generator For E1
The arbitrary pulse generator divides the pulse into eight individual segments. Each segment is set by a 7-Bit
binary word by programming the appropriate channel register. This allows the system designer to set the
overshoot, amplitude, and undershoot for a unique line build out. The MSB (bit 7) is a sign-bit. If the sign-bit is
set to "0", the segment will move in a positive direction relative to a flat line (zero) condition. If this sign-bit is
set to "1", the segment will move in a negative direction relative to a flat line condition. The resolution of the
DAC is typically 60mV per LSB. Thus, writing 7-bit = 1111111 will clamp the output at either voltage rail
corresponding to a maximum amplitude. A pulse with numbered segments is shown in Figure 18.
FIGURE 18. ARBITRARY PULSE SEGMENT ASSIGNMENT
Segment
1
2
3
4
5
6
7
8
Register
0xn8
0xn9
0xna
0xnb
0xnc
0xnd
0xne
0xnf
1
2
3
4
8
7
6
5
NOTE: By default, the arbitrary segments are programmed to 0x00h. The transmitter outputs will result in an all zero
pattern to the line interface.
3.6 DMO (Digital Monitor Output)
30
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