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CS61581 Datasheet(PDF) 18 Page - Cirrus Logic

Part # CS61581
Description  T1/E1 Universal Line Interface
PDF  37 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS61581 Datasheet(HTML) 18 Page - Cirrus Logic

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CS61581
18
DS211PP8
2.13
Control Register 1 LH (CR2.0 = 0): Address 0x10
TAOS
Transmit All Ones Select
When TAOS = 1, all ones are transmitted at the TCLK frequency
LLOOP
Local Loopback
When LLOOP = 1, data input at TPOS, TNEG (TDATA) is internally looped back and output on
RPOS, RNEG (RDATA). TCLK is routed to RCLK, through the jitter attenuator, if activated.
RLOOP
Remote Loopback
When RLOOP = 1, clock and data recovered by the receiver are sent back through the transmit
path and retransmitted. The clock and data are routed through the jitter attenuator, if activated.
LBO[2:1]
Line Build Out
LBO2
LBO1
Attenuation
00
0 dB
01
-7.5 dB
1
0
-15 dB
1
1
-22.5 dB
For E1 long haul, only the 0 dB setting should be used when the part is configured for matched
impedance drive.
CODER
Zero Substitution (valid only when TNEG (UBS) is tied high, invoking unipolar mode).
In Long Haul mode, setting CODER to “1” enables B8ZS (HDB3) encoding and decoding.
The substitution depends on whether the CS61581 is configured for T1 or E1 operation. via the
E1_LH bit, CR3.6
(TAZ)
Transmit All Zeroes (valid only when TNEG (UBS) is tied low, invoking bipolar mode).
When in bipolar mode (TPOS/TNEG are data inputs) setting TAZ to “1” causes all zeros to be
transmitted.
NLOOP
Network Loopback
NLOOP = 1 when a network loopback code has been detected on the received signal.
An interrupt will occur when NLOOP changes state unless a “1” is written to NLOOP disabling
the interrupt.
LOS
Loss Of Signal
LOS = 1 when the loss of signal criteria have been met (175 zeros).
LOS = 0 when a valid signal is being received.
An interrupt will occur when LOS changes state unless a “1” is written to LOS disabling the in-
terrupt.
7 (MSB)
65
4321
0 (LSB)
TAOS
LLOOP
RLOOP
LB02
LB01
CODER
TAZ
NLOOP
LOS
CS61581
18
DS211F1



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