Cirrus-logic CS61880 Manual do Utilizador descarregar pdf (Página 23)

CS61880

DS450PP3 23

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 40), 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.

T1 1:2

RRING

RECEIVE

LINE

0.1

CS61880

One Receiver

RTIP

RCLK

RPOS

RNEG

Figure 3. G.703 BITS Clock Mode in NRZ Mode

T1 1:2

RRING

RECEIVE

LINE

0.1

CS61880

One Receiver

RTIP

RCLK

RPOS

RNEG

Figure 4. G.703 BITS Clock Mode in RZ Mode

T1 1:2

RRING

RECEIVE

LINE

0.1

CS61880

One Channel

RTIP

RCLK

RPOS

RNEG

TCLK

TPOS

TNEG

REMOTE

LOOPBACK

T1 1:1.15

TRANMIT

LINE

TRING

TTIP

Figure 5. G.703 BITS Clock Mode in Remote Loopback

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 69 70

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