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參數(shù)資料
| 型號： | MT8920B |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | ST-BUS Parallel Access Circuit(串行通信總線（ST-Bus）并行存取電路（在ST總線和并行系統(tǒng)間提供一個簡單接口）) |
| 中文描述： | 意法半導體總線并行訪問電路（串行通信總線（圣總線）并行存取電路（在圣總線和并行系統(tǒng)間提供一個簡單接口）） |
| 文件頁數(shù)： | 12/29頁 |
| 文件大?。?/td> | 215K |
| 代理商： | MT8920B |
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MT8920B
CMOS
3-14
connected directly to
appropriately.
CS to enable the device
Figure 9 - "Daisy-chained" STPA’s in 32 Channel
Parallel Bus Controller Mode (Mode 3)
In order to facilitate efficient use of the parallel bus
another signal, similar to STCH, is supplied by the
STPA. Delayed Chip Select (DCS) becomes active
for the last half of each channel (Figure 19). This
may be connected to a second STPA, residing on the
same physical parallel bus, enabling it to perform its
read/write operations in the second half of each
channel. This allows a large number of devices,
connected on a common bus, to be driven by two
ST-BUS streams. Figure 9 shows how this "daisy
chaining" of STPA’s is implemented while Figure 10
illustrates the timing on the shared parallel bus.
Applications
Parallel PBX to Digital Trunk Interface
The STPA is an ideal component for interfacing
parallel PBX environments to Mitel’s family of digital
trunk devices.
Figure 11 shows a typical interface for both T1/ESF
and CRC-4 CEPT digital trunks to a system utilizing
a parallel bus architecture. Both the MH89760B
T1/ESF and the MH89790B CRC-4 CEPT trunk
modules are shown interfaced to a parallel bus
structure using two STPAs operating in modes 1 and
2.
The first STPA operating in mode 2 (MMS=0,
MS1=1,
24/32=0),
routes
information between the parallel telecom bus and the
T1 or CEPT link via DSTi and DSTo. The second
STPA, operating in mode 1 (MMS=1) provides
access from the signalling and link control bus to the
MH89760B or MH89790B status and control
channels. All signalling and link functions may be
controlled easily through the STPA transmit RAM’s
Tx0, Tx1, while status information is read at receive
RAM Rx0. In addition, interrupts can be set up to
notify the system in case of slips, loss of sync,
alarms, violations, etc.
data
and/or
voice
Common Bus
0
0
1
OE
WE
A0
A1
A2
A3
A4
CS
DCS
0
0
1
OE
WE
A0
A1
A2
A3
A4
CS
STCH
STi0
STo0
STi0
STo0
MMS MS1 24/32
MMS MS1 24/32
Figure 10 - Timing Relationship for Mode 3 Daisy Chaining
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
N + 1
N - 1
N + 1
N - 1
IN
OUT
IN
OUT
ST-BUS
C4i
Address
OE
WE
Data Bus
STCH
DCS
CHANNEL N
相關PDF資料 |
PDF描述 |
|---|---|
| MT8924-1 | PCM Conference Circuit (PCC) Preliminary Information |
| MT8924AE | PCM Conference Circuit (PCC) Preliminary Information |
| MT8924AS | PCM Conference Circuit (PCC) Preliminary Information |
| MT8924 | PCM Conference Circuit (PCC) Preliminary Information |
| MT8930B | () |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MT8920B-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit |
| MT8920BC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit |
| MT8920BE | 制造商:Mitel Networks Corporation 功能描述:COMMUNICATIONS INTERFACE, 28 Pin, Plastic, DIP |
| MT8920BE1 | 制造商:Zarlink Semiconductor Inc 功能描述:ST-BUS PARALLEL ACCESS CIRCUIT 28PDIP - Rail/Tube 制造商:Microsemi 功能描述:Microsemi MT8920BE1 Interface Misc |
| MT8920BP | 制造商:Microsemi Corporation 功能描述: 制造商:MITEL 功能描述: |
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