XRT83SL314ES Exar, XRT83SL314ES Datasheet - Page 22

• Manufacturer Part Number: XRT83SL314ES
• Description: LIN Transceivers 14 CHT1/E1 LIUSH
• Manufacturer: Exar

Specifications of XRT83SL314ES

• Product Category: LIN Transceivers
• Rohs: yes

XRT83SL314
REV. 1.0.1
The ability to detect the amount of cable loss on the receiver inputs is enhanced by having the ability to
generate an interrupt by programming a pre-determined value for cable loss into the EQFLAG[5:0] global
register. This is particularly useful in applications where it is necessary for the LIU to generate an interrupt for
a cable loss which is lower than the declaration of the RLOS feature (see the RLOS section in this datasheet).
If the contents of the EQFLAG[5:0] register bits are equal to or less than the contents in the cable loss indicator
bits CLOS[5:0] for a given channel, an interrupt will be generated (if enabled in the appropriate channel register
and GIE is to "1"). Using the same example in Figure 7, a simplified block diagram of the equalizer flag is
shown in Figure 8.
F
The peak detector provides feedback to the equalizer control circuit until the amplitude of the incoming signal is
at an appropriate level. Once this level is obtained, the slicer identifies the incoming signal as a "1" and passes
the raw data to the clock and data recovery circuit. The slicer threshold is selected by programming SL[1:0] in
the appropriate global register. Selecting the slicer level is shown in Table 4.
2.4
2.5
IGURE
8. S
Equalizer Attenuation Flag
Peak Detector and Slicer
IMPLIFIED
B
T
LOCK
ABLE
Receiver Inputs
RTIP/RRING
D
4: S
IAGRAM OF THE
ELECTING THE
-15dB of Cable
SL[1:0]
0h (00)
1h (01)
2h (10)
3h (11)
Loss
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
E
QUALIZER
S
LICER
Peak Detector
Equalizer and
19
L
EVEL FOR THE
A
EQFLAG[5:0] = 0x0Fh
CLOS[5:0] = 0x0Fh
TTENUATION
Programmable
Read Only
S
LICER
50%
45%
55%
68%
P
F
L
EAK
LAG
Generate an Interrupt
If (CLOS = EQFLAG)
EVEL
XRT83SL314
D
ETECTOR
xr