CS61884 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CS61884' PDF : 71 Pages View PDF
CS61884
8. BUILDING INTEGRATED TIMING SYSTEMS (BITS) CLOCK MODE
This mode is used to enable one or more channels
as a stand-alone timing recovery unit used for
G.703 Clock Recovery.
In hardware mode, BITS Clock mode is selected by
pulling the MUX pin “HIGH”. This enables only
channel zero as a stand-alone timing recovery unit,
no other channel can be used as a timing recovery
unit.
In host mode, each channel can be setup as an inde-
pendent G.703 timing recovery unit, through the
Bits Clock Enable Register (1Eh) (See Section
14.31 on page 41), setting the desired bit to “1” en-
ables BITS Clock mode for that channel. The fol-
lowing diagrams show how the BITS clock
function operates.
RCLK
RTIP
CS61884
RPOS
One Receiver
RNEG
0 .1 µ F R1
R2
RECEIVE
LINE
RRING
T1 1:2
Figure 3. G.703 BITS Clock Mode in NRZ Mode
RCLK
RTIP
CS61884
RPOS
One Receiver
RNEG
0 .1 µ F R1
R2
RECEIVE
LINE
RRING
T1 1:2
Figure 4. G.703 BITS Clock Mode in RZ Mode
RCLK
RPOS
RNEG
TCLK
TPOS
TNEG
RTIP
CS61884
0 .1 µF
R1
One Channel
R2
RECEIVE
LINE
REMOTE
LOOPBACK
RRING
TTIP
T1 1:2
TRANMIT
LINE
TRING
T1 1:2
Figure 5. G.703 BITS Clock Mode in Remote Loopback
DS485F1
23
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