CS61884-IQZ Cirrus Logic Inc, CS61884-IQZ Datasheet - Page 29

• Manufacturer Part Number: CS61884-IQZ
• Description: IC,PCM TRANSCEIVER,OCTAL,CEPT PCM-30/E-1,QFP,144PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc

Specifications of CS61884-IQZ

• Rohs Compliant: YES

12. OPERATIONAL SUMMARY
A brief summary of the CS61884 operations in hardware and host mode is provided in
12.1 Loopbacks
The CS61884 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
Loopback Register (01h)
page 35),
Section 14.3 on page 35), and
Reset Register (0Ch)
page 37).
DS485F1
MCLK
Active
Active
Active
Active
Active
Active
Active
H
H
H
H
H
H
H
H
H
L
L
L
Remote Loopback Register (02h)
TCLK
Active
Active
Active
Active
Active
Active
Active
H
H
H
H
H
H
H
L
L
L
L
L
LOOP
Open
Open
Open
Open
Open
(See Section 14.13 on
H
X
H
X
X
X
H
H
H
L
L
L
L
L
(See Section 14.2 on
Digital Loopback
RCLK/Data Recovery
RCLK/Data Recovery
RCLK/Data Recovery
RCLK/Data Recovery
RCLK/Data Recovery
RCLK/Data Recovery
RCLK/Data Recovery
Table 7. Operational Summary
Receive Mode
Data Recovery
Data Recovery
Data Recovery
Data Recovery
Data Recovery
Data Recovery
Data Recovery
Data Recovery
Data Recovery
Power Down
Power Down
Power Down
Analog
(See
12.2 Analog Loopback
In
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 8 on page
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
log Loopback Register (01h)
page 35).
NOTE: The simultaneous selection of Analog and
Analog
Remote loopback modes is not valid. A TAOS
request overrides the data on TPOS and TNEG
during Analog Loopback. Refer to
page
Transmit Mode
Unipolar/Bipolar
Unipolar/Bipolar
Unipolar/Bipolar
Unipolar/Bipolar
Unipolar/Bipolar
Unipolar/Bipolar
Unipolar/Bipolar
30.
Power Down
Power Down
Power Down
Power Down
Loopback,
RZ Data
RZ Data
RZ Data
RZ Data
RZ Data
RZ Data
TAOS
TAOS
30. In hardware mode, Analog
the
(See Section 14.2 on
Remote Loopback
Remote Loopback
Remote Loopback
Remote Loopback
Remote Loopback
Analog Loopback
Analog Loopback
Analog Loopback
Analog Loopback
Table
output
Loopback
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
CS61884
7.
Figure 9 on
of
Ana-
the
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