XRT72L13 Datasheet, PDF (304/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
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PRELIMINARY
FIGURE 98. WAVEFORM/TIMING RELATIONSHIP BETWEEN RXLINECLK, RXPOS AND RXNEG - WHEN RXPOS AND
RXNEG ARE TO BE SAMPLED ON THE FALLING EDGE OF RXLINECLK
RxLineClk
t40
t41
RxPOS
RxNEG
4.3.2 The Receive DS3 Framer Block
The Receive DS3 Framer block accepts decoded
DS3 data from the "Receive DS3 LIU Interface" block,
and routes data to the following destinations.
• The "Receive Payload Data Output Interface Block"
• The “Receive Overhead Data Output Interface"
Block.
• The “Receive DS3 HDLC Controller” Block
Figure 99 presents a simple illustration of the "Re-
ceive DS3 Framer" block; along with the associated
paths to the other functional blocks within the Framer
chip.
FIGURE 99. A SIMPLE ILLUSTRATION OF THE RECEIVE DS3 FRAMER BLOCK AND THE ASSOCIATED PATHS TO THE
OTHER FUNCTIONAL BLOCKS
To Receive DS3 HDLC
Buffer
Receive Overhead Data
Output Interface
Receive Payload Data
Output Interface
RReecceeiviveeDDSS33FFrraammeerr
BBlolocckk
From Receive DS3
LIU Interface Block
292