參數(shù)資料
型號(hào): XRT83VSH314
廠商: Exar Corporation
英文描述: 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: 14-CHANNEL的T1/E1/J1短途線路接口單元
文件頁(yè)數(shù): 32/80頁(yè)
文件大?。?/td> 497K
代理商: XRT83VSH314
XRT83VSH314
29
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.1
4.6.2
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 45mV 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
.
F
IGURE
18. A
RBITRARY
P
ULSE
S
EGMENT
A
SSIGNMENT
Arbitrary Pulse Generator For T1 and E1
N
OTE
:
By default, the arbitrary segments are programmed to 0x00h. The transmitter outputs will result in an all zero
pattern to the line interface.
4.6.3
Setting Registers to select an Aribtrary Pulse
For T1: Address:0x0D hex
For E1: Address: 0xF4 hex, bit D0
To program the transmit output pulse, once the arbitrary pulse has been selected, write the appropriate values
into the segment registers in
Table 11
.
The transmit output pulse is divided into eight individual segments. Segment 1 corresponds to the beginning of
the pulse and segment 8 to end the pulse. The value for each segment can be programed individually through
a corresponding 8-bit register. In normal operation, i.e., non-arbitrary mode, codes are stored in an internal
ROM are used to generate the pulse shape, as shown in
Table 11
. Typical ROM values are given below in Hex.
1
2
3
4
5
6
7
8
Segment
Register
1
2
3
4
5
6
7
8
0xn8
0xn9
0xna
0xnb
0xnc
0xnd
0xne
0xnf
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