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CS61880 数据表(PDF) 29 Page - Cirrus Logic

部件名 CS61880
功能描述  OCTAL E1 LINE INTERFACE UNIT
PDF  70 Pages
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制造商  CIRRUS [Cirrus Logic]
网页  http://www.cirrus.com
标志 CIRRUS - Cirrus Logic

CS61880 数据表(HTML) 29 Page - Cirrus Logic

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CS61880
DS450PP3
29
12. OPERATIONAL SUMMARY
A brief summary of the CS61880 operations in hardware and host mode is provided in Table 8.
12.1 Loopbacks
The CS61880 provides three loopback modes for
each port. Analog Loopback connects the transmit
signal on TTIP and TRING to RTIP and RRING.
Digital Loopback Connects the output of the En-
coder to the input of the Decoder (through the Jitter
Attenuator if enabled). Remote Loopback connects
the output of the Clock and Data Recovery block to
the input of the Pulse Shaper block. (Refer to de-
tailed descriptions below.) In hardware mode, the
LOOP[7:0] pins are used to activate Analog or Re-
mote loopback for each channel. In host mode, the
Analog, Digital and Remote Loopback registers are
used to enable these functions (Refer to the Analog
Loopback Register (01h) (See Section 14.2 on
page 35), Remote Loopback Register (02h) (See
Section 14.3 on page 35), and Digital Loopback
Reset Register (0Ch) (See Section 14.13 on
page 36).
12.2 Analog Loopback
In
Analog
Loopback,
the
output
of
the
TTIP/TRING driver is internally connected to the
input of the RTIP/RRING receiver so that the data
on TPOS/TNEG and TCLK appears on the
RPOS/RNEG and RCLK outputs. In this mode the
RTIP and RRING inputs are ignored. Refer to
Figure 7 on page 30. In hardware mode, Analog
Loopback is selected by driving LOOP[7:0] high.
In host mode, Analog Loopback is selected for a
given channel using the appropriate bit in the Ana-
log Loopback Register (01h) (See Section 14.2 on
page 35).
NOTE: The simultaneous selection of Analog and
Remote loopback modes is not valid. A TAOS
request overrides the data on TPOS and TNEG
during Analog Loopback. Refer to Figure 8 on
page 30.
Table 8. Operational Summary
MCLK
TCLK
LOOP
Receive Mode
Transmit Mode
Loopback
Active
Active
Open
RCLK/Data Recovery
Unipolar/Bipolar
Disabled
Active
Active
L
RCLK/Data Recovery
Unipolar/Bipolar
Remote Loopback
Active
Active
H
RCLK/Data Recovery
Unipolar/Bipolar
Analog Loopback
Active
L
X
RCLK/Data Recovery
Power Down
Disabled
Active
H
Open
RCLK/Data Recovery
TAOS
Disabled
Active
H
L
RCLK/Data Recovery
Unipolar/Bipolar
Remote Loopback
Active
H
H
RCLK/Data Recovery
TAOS
Analog Loopback
L
Active
X
Power Down
Unipolar/Bipolar
Disabled
L
H
X
Power Down
RZ Data
Disabled
L
L
X
Power Down
Power Down
Disabled
H
Active
Open
Data Recovery
Unipolar/Bipolar
Disabled
H
Active
L
Data Recovery
RZ Data
Remote Loopback
H
Active
H
Data Recovery
Unipolar/Bipolar
Analog Loopback
H
L
Open
Data Recovery
Power Down
Disabled
H
L
L
Data Recovery
RZ Data
Remote Loopback
H
L
H
Data Recovery
Power Down
Disabled
H
H
Open
Data Recovery
RZ Data
Disabled
H
H
L
Data Recovery
RZ Data
Remote Loopback
H
H
H
Data Recovery
RZ Data
Analog Loopback



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