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參數(shù)資料
| 型號： | MT8930CE |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | Subscriber Network Interface Circuit |
| 中文描述： | DATACOM, DIGITAL SLIC, PDIP28 |
| 封裝： | PLASTIC, MS-011AB, DIP-28 |
| 文件頁數(shù)： | 5/41頁 |
| 文件大?。?/td> | 2516K |
| 代理商： | MT8930CE |
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Data Sheet
MT8930C
5
Functional Description
The MT8930C Subscriber Network Interface Circuit
(SNIC) is a multifunction transceiver providing a
complete interface to the S/T Reference Point as
specified in ETS 300-012, CCITT Recommendation
I.430
and
ANSI
T1.605.
point-to-point and point-to-multipoint voice/data
transmission, the SNIC may be used at either end of
the digital subscriber loop. A programmable digital
interface allows the MT8930C to be configured as a
Network Termination (NT) or as a Terminal
Equipment (TE) device.
Implementing
both
The SNIC supports 192 kbit/s (2B+D + overhead) full
duplex data transmission on a 4-wire balanced
transmission line. Transmission capability for both B
and D channels, as well as related timing and
synchronization functions, are provided on chip. The
signalling capability and procedures necessary to
enable customer terminals (TEs) to be activated and
deactivated,
form
part
functionality. The SNIC handles D-channel resource
allocation and prioritization for access contention
resolution and signalling requirements in passive bus
line configurations. Control and status information
of
the
MT8930C’s
allows implementation of maintenance functions and
monitoring of the device and the subscriber loop.
An HDLC transceiver is included on the SNIC for link
access protocol handling via the D-channel.
Depacketized data is passed to and from the
transceiver via the microprocessor port. Two 19 byte
deep FIFOs, one for transmit and one for receive,
are provided to buffer the data. The HDLC block can
be set up to transmit or receive to/from either the
S-interface port or the ST-BUS port. Further, the
transmit destination and receive source can be
independently selected, e.g., transmit to S-interface
while receiving from ST-BUS. The transmit and
receive paths can be separately enabled or disabled.
Both, one and two byte address recognition is
supported by the SNIC. A transparent mode allows
data to be passed directly to the D channel without
being packetized.
A block diagram of the MT8930C is shown in Figure
1. The SNIC has three interface ports: a 4-wire
CCITT compatible S/T interface (subscriber loop
interface), a 2048 kbit/s ST-BUS serial port, and a
general purpose parallel microprocessor port. This
8-bit parallel port is compatible with both Motorola or
Figure 3 - SNIC Pin Connections in Various Modes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
28
27
26
25
24
23
22
21
HALF
C4bi
F0bi
F0od
DSTi
DSTo
Cmode
NT
R/W/WR
DS/RD
AS/ALE
CS
IRQ, NDA
VSS
VDD
VBias
LTx
LRx
STAR
Rsti
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
28
27
26
25
24
23
22
21
HALF
C4bo
F0bo
F0od
DSTi
DSTo
Cmode
CK
R/W/WR
DS/RD
AS/ALE
CS
IRQ, NDA
VSS
VDD
VBias
LTx
LRx
Rsto
Rsti
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
28
27
26
25
24
23
22
21
HALF
C4bi
F0bi
F0od
DSTi
DSTo
Cmode
NT
AFT
DinB
P/SC
IC
IC
VSS
VDD
VBias
LTx
LRx
STAR
Rsti
DR
AR
M/Si
MCHo
MFRi
SYNC/BA
IS1
IS0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
28
27
26
25
24
23
22
21
HALF
C4bo
F0bo
F0od
DSTi
DSTo
Cmode
CK
PRI
DinB
P/SC
DReq
DCack
VSS
VDD
VBias
LTx
LRx
Rsto
Rsti
DR
AR
M/So
MCHi
MFRo
SYNC/BA
IS1
IS0
NT MODE
NT MODE
TE MODE
TE MODE
CONTROLLER MODE
CONTROLLERLESS MODE
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MT8930CP | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Subscriber Network Interface Circuit |
| MT8930CPR | 制造商:Microsemi Corporation 功能描述: |
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