CDB61880 Cirrus Logic Inc, CDB61880 Datasheet - Page 7

• Manufacturer Part Number: CDB61880
• Description: Audio Modules & Development Tools Eval Bd Octal E1 Line Interface Unit
• Manufacturer: Cirrus Logic Inc

Specifications of CDB61880

• Description/function: Audio DSPs
• Operating Supply Voltage: 5 V
• Product: Audio Modules
• For Use With/related Products: CS61880
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

mitters in a high impedance state. Removing the
shorting block, enables the transmitters.
Figure 5.
2.6 Clock Edge Selection
In clock/data recovery mode, jumper J93 selects
the edge of RCLK and SCLK on which the
RPOS/RDATA, RNEG, and SDO data signals are
valid. When in data recovery mode, jumper J93 se-
lects the output polarity of RPOS/RNEG. The func-
tion of J93 applies to both the Hardware and Host
mode.
and the effect in both clock/data recovery and data
recovery only mode.
2.7 Jitter Attenuator Selection
In Hardware mode, switch S10 (JASEL) controls
the position of the jitter attenuator for all eight
channels. The corner frequency and FIFO length
DS450DB1
Enable all eight
transm itters
Figure 6
Figure 5. Transmitter Enable Selection
L O
L O
H I
H I
Figure 6. Clock Edge Selection
H I
LO
shows the settings for jumper J93
Clock/Data Recovery -
R P O S / R N E G = f a l l i n g
e d g e R C L K S D O =
rising edge SCLK
Clock/Data Recovery -
R P O S / R N E G = r i s i n g
e d g e R C L K S D O =
falling edge SCLK
Data Recovery -
R P O S / R N E G
polarity active low
Data Recovery -
R P O S / R N E G
polarity active high
eight transm itters
H i-Z all
H I
LO
See
can not be changed in Hardware mode.
shows the settings for switch S10.
In Host mode, switch S10 has no effect on the
CS61880 device and should be set to the open
(middle) position.
2.8 Loopback Mode Selection
In Hardware mode, the Loopback modes are con-
figured with switches S1 through S8 (0-7).
shows the three different settings for all eight loop
back switches.
In Host mode, switches S1 through S8 must be set
to the NONE (middle) position to allow host inter-
face control.
Hardware Mode -
Selects Remote
O P E N
H I G H
L O W
Hardware Mode
L o o p b a c k
- JA placed in
transmit path
S1 - S8
0 - 7
J A S E L
S10
Figure 7. Jitter Attenuator Selection
Figure 8. Loopback Mode Selection
O P E N
L O W
Hardware Mode -
H I G H
Hardware Mode
- JA Disabled
Selects no
S1 - S8
L o o p b a c k
0 - 7
J A S E L
S10
CDB61880
O P E N
H I G H
L O W
Hardware Mode -
Hardware Mode
- JA placed in
Selects local
receive path
S1 - S8
L o o p b a c k
0 - 7
J A S E L
S10
Figure 7
Figure 8
7