參數(shù)資料
型號(hào)： MT8931B
廠商： Mitel Networks Corporation
英文描述： ()
中文描述： （）
文件頁(yè)數(shù)： 16/29頁(yè)
文件大小： 277K
代理商： MT8931B
MSAN-141
Application Note
A-216
Since the same physical register is used to receive
data from the ST-BUS and transmit this information
to the S-Bus, the register can not be accessed while
the information of the register is being shifted in or
out of the line or system ports. Therefore, the New
Data Available (NDA) signal is generated from the
MT8930B/31B which will guarantee access
to all synchronous registers. The NDA signal is
output on the IRQ, NDA pin only if this feature
is enabled through B2 of the master control register
(B2=1). In certain applications, the timing constraint
placed on the microprocessor access to the various
registers may leave insufficient time to access all
relevant registers. In this situation, specific registers
can be accessed outside the
timing for these registers is provided in Figure 14.
NDA window. The
4.1.2.2
Asynchronous Access
The asynchronous registers, on the other hand, are
those registers which may be accessed at any time.
These registers are mainly used to establish the
mode of the microport or to manipulate the HDLC
formatter.
4.1.3
Bit Orders
When using the B-channels for PCM voice, the first
bit to be transmitted on the S-Bus should be the sign
bit. This complies with the existing telecom
standards which transmit PCM voice as most
significant bit first. However, if the B-channels are to
carry data, the bit ordering must be reversed to
comply with the existing datacom standards (i.e.,
least significant bit first).
These contradicting standards place a restriction on
all information input and output through the serial
and parallel ports. Information transferred through
the serial ports, will maintain the integrity of the bit
order. Data sent to either serial port from the parallel
port, will transmit the least significant bit first.
Therefore,
a
PCM
byte
microprocessor port must be reordered to have the
sign bit as the least significant bit.
input
through
the
The D-channel received on DSTi must be ordered
with the least significant bit first as shown in Figure
13. This also applies to the D-channel directed to
DSTo from the microprocessor port.
The C-channel bit mapping from the parallel port to
the ST-BUS is organized such that the most
significant bit is transmitted or received first.
4.2
Controllerless Mode
This option is available only in the MT8930B. It
allows the SNIC to function without the need of a
controlling processor. The C
mode
pin is used as the
select input to the multiplexer. When C
mode
is high,
the micro port reverts to the 8 bit multiplexed bus
microprocessor port with all relevant timing inputs.
When C
mode
is low, the controllerless mode is
selected and the parallel port reverts to a hardwired
control/status port.
Note:
Type A: includes writing to DSTo, D, C, B1, and B2; and reading from the S-Bus RxD, B1, and B2.
Type B: includes writing to the S-Bus Tx B1 channel.
Type C: includes writing to the S-Bus Tx B2, and D; and reading from DSTi D, C, B1, and B2.
Figure 14 - Synchronous Access Timing
Characteristics
Sym
t
SAA
t
SAB
t
SAC
Min
Typ
124.75
62.5
109.3
Max
Units
μ
s
μ
s
μ
s
Test Conditions
1
2
3
Synchronous Access Type A
Synchronous Access Type B
Synchronous Access Type C
F0b
DSTi/o
NDA
t
SAA
t
SAB
t
SAC
相關(guān)PDF資料
PDF描述
MT8930C-1 SWITCH, ON-OFF, CHROM/BLK BTN; Switch function type:SPST Latching; Voltage, contact AC max:125V; Voltage, contact DC max:24V; Temp, op. max:85(degree C); Temp, op. min:-40(degree C); Diameter, panel cut-out:13.6mm; Length / Height, RoHS Compliant: Yes
MT8930C Subscriber Network Interface Circuit(用戶(hù)網(wǎng)絡(luò)接口電路（提供點(diǎn)到點(diǎn)或點(diǎn)到多點(diǎn)數(shù)字傳送）)
MT8930 CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit Preliminary Information
MT8930C CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit Preliminary Information
MT8930CC CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit Preliminary Information
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT8931BC 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:Subscriber Network Interface Circuit
MT8931BE 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:Subscriber Network Interface Circuit
MT8931BP 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:Subscriber Network Interface Circuit
MT8931C 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:Subscriber Network Interface Circuit
MT8931C-1 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*