XRT79L71_10 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT79L71_10' PDF : 609 Pages View PDF
XRT79L71
PRELIMINARY
1-CHANNEL DS3/E3 CLEAR-CHANNEL FRAMERLIU COMBO - CC/HDLC ARCHITECTURE
REV. P2.0.0
The Receive UTOPIA Interface block can be configured to operate with either an 8 or 16-bit wide Receive
UTOPIA Data bus.
NOTE: The Receive UTOPIA Interface block supports UTOPIA Level 3 from a signaling stand-point. The Receive UTOPIA
Interface block (within the XRT79L71) still only supports a 16-bit wide (not 32-bit wide) UTOPIA Bus and only
operates up to 50MHz (not 100MHz).
1.3.20 A more detailed Functional/Architectural Description of the XRT79L71, when configured to
operate in the ATM UNI Mode, can be found in the document (79L71_Arch_Descr_ATM.pdf).
(Architectural/Functional Description of the XRT79L71 1-Channel DS3/E3 ATM UNI/PPP/Clear-Channel
Framer with LIU IC - ATM UNI Mode Applications).
1.4 FUNCTIONAL ARCHITECTURE/DESCRIPTION OF THE XRT79L71 - PPP OVER DS3/E3 MODE
If the XRT79L71 has been configured to operate in the PPP over DS3/E3 Mode, then it will have the Functional
Architecture as is presented below in Figure 5.
FIGURE 5. THE FUNCTIONAL BLOCK DIAGRAM OF THE XRT79L71 WHEN IT HAS BEEN CONFIGURED TO OPERATE IN
THE PPP OVER DS3/E3 MODE
TTxx
PPOOSS-P-PHHYY
InInteterrfafaccee
BBlolocckk
TTx x PPPPPP
PPaacckkeet t
PPrroocceesssosorr
BBlolocckk
TTxxDDSS33/E/E33
FFrraammeerr
BBlolocckk
DDSS33/E/E33
JJititteterr
AAtttetennuuaatotorr
BBlolocckk
TTxxDDSS33/E/E33
LLIUIU
BBlolocckk
RRxx
PPOOSS-P-PHHYY
InInteterrfafaccee
BBlolocckk
RRx x PPPPPP
PPaacckkeet t
PPrroocceesssosorr
BBlolocckk
RRxxDDSS33/E/E33
FFrraammeerr
BBlolocckk
DDSS33/E/E33
JJititteterr
AAtttetennuuaatotorr
BBlolocckk
RRxxDDSS33/E/E33
LLIUIU
BBlolocckk
Only one JA exists.
Can be configured in
Tx or Rx Path
Figure 5 indicates that the XRT79L71 consists of the following functional blocks.
The Transmit POS-PHY Interface block
The Transmit Overhead Data Input Interface block
The Transmit PPP Packet Processor Block
The Transmit FEAC Controller Block (DS3, C-bit Parity Applications Only)
The Transmit Trail-Trace Message Controller Block (E3, ITU-T G.832 Applications Only)
The Transmit SSM Controller Block (E3, ITU-T G.832 Applications Only)
The Transmit LAPD Controller Block
The Transmit DS3/E3 Framer Block
The Transmit DS3/E3 LIU Block
he Receive DS3/E3 LIU Block
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