XRT74L74 Datasheet, PDF (375/498 Pages) Exar Corporation – 4 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER

PRELIMINARY
XRT74L74
4 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER
REV. P1.1.1
FIGURE 155. ILLUSTRATION OF THE SIGNALS THAT ARE OUTPUT VIA THE RECEIVE OVERHEAD DATA OUTPUT INTER-
FACE BLOCK (FOR METHOD 2).
RxOutClk
RxOHEnable
RxOHFrame
Recommended
Sampling
Edges
RxOH
BIP - 4, Bit 0
FAS, Bit 9
FAS, Bit 8
FAS, Bit 7
FAS, Bit 6
6.3.5 The Receive Payload Data Output Inter-
face
Figure 156 presents a simple illustration of the Re-
ceive Payload Data Output Interface block.
FIGURE 156. THE RECEIVE PAYLOAD DATA OUTPUT INTERFACE BLOCK
RxOHInd
RxSer
RxNib[3:0]
RxClk
RxOutClk
RxFrame
Receive
Payload Data
Output Interface
From Receive
E3 Framer Block
Each of the output pins of the Receive Payload Data
Output Interface block are listed in Table 83 and de-
scribed below. The exact role that each of these out-
put pins assume, for a variety of operating scenarios
are described throughout this section.
373