參數(shù)資料
型號： 28222-14
廠商： Conexant Systems, Inc.
英文描述： ATM Transmitter/Receiver with UTOPIA Interface
中文描述： 自動柜員機(jī)發(fā)射機(jī)/接收機(jī)的UTOPIA接口
文件頁數(shù)： 37/161頁
文件大?。?/td> 1832K
代理商： 28222-14
0
CN8223
2.0 Functional Description
ATM Transmitter/Receiver with UTOPIA Interface
2.2 Line Framers
100046C
Conexant
2-3
2.2 Line Framers
This section describes the operation and control of the internal framers for DS3,
E3 (both G.751 and G.832), E4 (G.832), STS-1, and STS-3c/STM-1 formatted
serial streams. The transmit and receive serial interfaces can operate at up to
155 MHz. Detailed timing information for the line interface is given in
Chapter 4.0
.
The framer receive circuitry recovers the frame location from the serial stream
and provides cell octets to the HEC/PLCP cell alignment block. All alarm and
error conditions are monitored and reported in status registers and event counters.
The framer transmit circuitry receives cell octets from the HEC/PLCP cell
alignment block and adds line framing overhead information. All alarm and error
conditions can be generated from control registers.
External interfaces to this block and the interface to the rest of the CN8223 are
illustrated in
Table 1-2
. The CN8223 line mode is set for both transmit and
receive in the CONFIG_1 register [0x00].
Table 2-1
lists the valid line modes set
by CONFIG_1.
Table 2-1. Valid CONFIG_1 Line Mode Settings, Bits 7–0
Type of Line Input Signal
PHY
Type
Unframed
Input
Disable
B3ZS/
HDB3
External
Framer
Enable
Parallel
Interface
Enable
HEC
Align
DS1
0
0
0
1
0
0 or 1
DS1 (externally gapped 192 bits/frame)
1
0
1
0
0
E1
1
0
0
1
0
0 or 1
E1 (externally gapped TS0 and TS16)
1
1
0
1
0
0
DS3, internal framer
2
0
0 or 1
0
0
0 or 1
DS3, external framer
2
0
0
1
0
0 or 1
DS3, external framer (gapped 84/85 bits)
2
1
0
1
0
0
E3, internal G.751 format
3
0
0 or 1
0
0
0
E3, external G.751 format
3
0
0
1
0
0
E3, external G.751 format (gapped first 16
bits)
3
1
0
1
0
0
E3, internal G.832 format
4
x
0 or 1
0
0
1
E4, internal G.832 format
5
x
1
0
0
1
STS-1, internal framer
6
x
0 or 1
0
0
1
STS-3c/STM-1, internal framer
7
x
1
0
0
1
Parallel or TAXI interface, 53 octet cells
0
x
0
1
1
1
NOTE(S):
x = Don
’
t Care.
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