參數(shù)資料
型號(hào)： MT8931CP
廠商： ZARLINK SEMICONDUCTOR INC
元件分類(lèi)： 數(shù)字傳輸電路
英文描述： Subscriber Network Interface Circuit
中文描述： DATACOM, DIGITAL SLIC, PQCC44
封裝： PLASTIC, MS-018AC, LCC-44
文件頁(yè)數(shù)： 11/39頁(yè)
文件大?。?/td> 833K
代理商： MT8931CP
Data Sheet
MT8931C
11
situation is when the system is trying to synchronize
two nodes of a synchronous network. This allows
multiple TEs to share a common ST-BUS timebase.
The synchronization of the loops is established by
using the clock signals produced by a local TE as an
input timing source to the NT slave.
Adaptive Timing Operation
On power-up or after a reset, the SNIC in NT mode is
set to operate in fixed timing. To switch to adaptive
timing, the user should:
1) set the DR bit to 1
2) set the Timing bit to 1 in the C-channel
Control Register
3) wait for 100 ms period
4) proceed in using the AR and DR bits as
desired
Switching from adaptive timing mode is completed
by resetting the Timing bit.
ST-BUS Interface
The ST-BUS is a synchronous time division
multiplexed serial bussing scheme with data streams
operating at 2048 kbit/s configured as 32, 64 kbit/s
channels (refer to Fig. 11). Synchroni-zation of the
data transfer is provided from a frame pulse which
identifies the frame boundaries and repeats at an 8
kHz rate. Figure 4 shows how the frame pulse
(F0b) defines the ST-BUS frame boundaries. All
data is clocked into the device on the rising edge of
the 4096 kHz clock (C4b) three quarters of the way
into the bit cell, while data is clocked out on the
falling edge of the 4096 kHz clock at the start of the
bit cell.
All timing signals (i.e. F0b & C4b) are identified as
bidirectional (denoted by the terminating b). The
I/O configuration of these pins is controlled by the
mode of operation (NT or TE). In the NT mode, all
synchronized signals are supplied from an external
source and the SNIC uses this timing while
transferring information to and from the S or
ST-BUS. In the TE mode, an on-board analog
phase-locked loop extracts timing from the received
data on the S-Bus and generates the system
4096 kHz (C4b) and frame pulse (F0b). The
analog phase-locked loop also maintains proper
phase relation between the timing signals as well as
Figure 13 - Daisy Chaining the SNIC
Figure 14 - NT in Star Configuration
ST-BUS Clock
ST-BUS
Stream
System
Frame Pulse
MT8931C
NT
F0b
F0od
MT8931C
NT
F0b
F0od
MT8931C
NT
F0b
F0od
MT8931C
NT
F0b
F0od
to TE
to TE
to TE
to TE
Active on
Channel 0 - 3
Active on
Channels 4 - 7
Active on
Channels 8 - 11
Active on
Channels 12 - 15
V
DD
to TE
to TE
STAR
F0b
DSTi
STAR
F0b
DSTi
MT8931C
NT
MT8931C
NT
MT8931C
NT
MT8931C
NT
to TE
to TE
System
Frame Pulse
Input
ST-BUS Stream
Output
ST-BUS Stream
STAR
F0b
DSTi
DSTo
STAR
F0b
DSTi
相關(guān)PDF資料
PDF描述
MT8931C-1 CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit
MT8931CE CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit Preliminary Information
MT8931C CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit Preliminary Information
MT8931CC CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit Preliminary Information
MT8931CP CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT8940 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:ISO-CMOS ST-BUS⑩ FAMILY T1/CEPT Digital Trunk PLL
MT8940-1 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:ISO-CMOS ST-BUS⑩ FAMILY T1/CEPT Digital Trunk PLL
MT8940AC 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:T1/CEPT Digital Trunk PLL
MT8940AE 制造商:MITEL 功能描述:
MT8941 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:Advanced T1/CEPT Digital Trunk PLL
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