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CS61318-IP Datasheet(PDF) 10 Page - Cirrus Logic

Part No. CS61318-IP
Description  E1 LINE INTERFACE UNIT
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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CS61318
10
DS441PP2
paths, or it can be eliminated from the circuit by
setting the XTALIN, pin 9, high. The jitter attenu-
ator on the CS61318 does not require a crystal, and
can be activated by setting XTALIN, pin 9, low
(preferred) or by floating pin 9.
The jitter attenuator’s corner frequency is approxi-
mately 1.25 Hz in order to comply with ETSI 300
011, CTR12, and recommendation I.431. A typical
jitter attenuation graph is shown in Figure 8.
2.6
Receiver Loss of Signal
The receiver will indicate loss of signal by setting
LOS, pin 12 high (CR1.0 = 1 in host mode), upon
power up, reset, when receiver gain is maximized,
or upon receiving 175+/-15 consecutive zeros. Re-
ceived zeros are counted based on recovered clock
cycles. When in the LOS state, received data is not
output from RPOS/RNEG (RDATA); but is
squelched until the device comes out of LOS. The
LOS condition is exited using ITU-T G.775 crite-
ria, namely 12.5% ones density for 175+/-75 bit pe-
riods with no more than 100 consecutive zeros. The
receiver recovers signals down to -36 dB, and LOS
will be declared below this signal level.
In LOS, the RCLK frequency depends on whether
MCLK is applied, and whether the jitter attenuator
is in the transmit or receive path. If the jitter atten-
uator is in the receive path, the jitter attenuator will
hold over the average incoming data frequency pri-
or to LOS. RPOS (RDATA) and RNEG pins are
forced low upon LOS.
When the jitter attenuator is in the transmit path or
not used, the clock recovery is referenced to
MCLK, if provided, or the crystal oscillator. The
frequency of RCLK in this case will simply remain
slaved to the clock reference upon loss of data. The
recovered clock remains as a 50% duty cycle clock.
2.7
Local Loopback
Local loopback is selected by setting LLOOP, pin
27, high (CR1.6 = 1 in host mode). Selecting local
loopback causes clock and data presented on
TCLK, TPOS/TNEG (TDATA) to be output at
RCLK, RPOS/RNEG (RDATA). Inputs to the
transmitter are still transmitted on TTIP and
RCLK
LATN
1
2
3
4
5
LATN = 1 RCLK, 9.5 dB of Attenuation
LATN = 2 RCLK, 1 9.5
LATN = 3 RCLK, 28.5 dB of Attenuation
LATN = 4 RCLK, 0 dB of Attenuation
dB of Attenuation
Figure 7. LATN Pulse Width encoding
Frequency in Hz
10
20
30
40
50
60
1
10
100
1 k
10 k
Minimum Attenuation Limit
Measured Performance
0
CS61318
Figure 8. Typical Jitter Transfer Function




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