FX909A, FX919A and FX929A GMSK and 4

Transcription

FX909A, FX919A and FX
GMSK and 4-Level FSK M
Data Pumps
Presented by:
Consumer Microcircuits Limited
© Consumer Microcircuits Limited 1996
Presentation Overview
• This presentation is intended to familiarise you with CM
4-Level FSK Modem Data Pump ICs, the FX909A, FX9
FX929A and their operation
• An Evaluation Kit, the EV9000, is now available to demo
investigate all operational facets of these products.
FX909A GMSK Wireless Modem Data Pump
FX919A 4-Level FSK Wireless Modem Data Pump
FX929A 4-Level FSK Wireless Modem Data Pump (R
Gaussian Filtered Minimum
Shift Keying (GMSK)
•
•
•
Input data bit stream is level-shifted and app
Gaussian lowpass filter
A Gaussian filter produces a Gaussian shape
pulse for an impulse input
Filter is easy to implement; provides good r
digital bit transmission
4-Level FSK
•
•
•
•
Each pair of data bits is coded as one of fou
levels (symbols): -3, -1, +1, +3
The signalling rate is half the data bit rate
The resulting 4-level signal is passed throu
Raised Cosine (RRC) lowpass filter
The filtered signal is applied to the Tx inpu
FX909A Introduction
A half duplex GMSK filtered packet data modem IC fo
wireless data links.
This modem contains all of the baseband signal processi
to handle the lower layers of Mobitex and general pu
data air interface protocols and is programmable to op
standard bit rates in the range: 4000 to 19200b/s, from
of Xtal/clock frequencies.
FX909A
GMSK Wireless Modem Data P
STATUS
REGISTER
IRQ
DATA
QUALITY
REGISTER
8
E CAF RET NI
RELL ORT N OCµ
VDD
D0
D1
D2
D3
D4
D5
D6
D7
DATA
BUS
BUFFERS
WR
RD
CS
A0
A1
ADDRESS
AND
R/W
DECODE
COMMAND
REGISTER
MODE
REGISTER
CONTROL
REGISTER
DATA
BUFFER
CRC
GENERATOR/
CHECKER
FEC
GENERATOR/
CHECKER
FRAME
SYNC DETECT
INTERLEAVE/
DE-INTERLEAVE
VBIAS
VSS
Tx Bits
Rx Fb
Rx Bits
SCRAMBLE/
DE-SCRAMBLE
D
Tx
Rx
Rx IN
XTAL
VBIAS
Rx
-
LOWPASS
FILTER
D
Rx Input Amp
Tx Output
Buffer
Tx
CLOCK
OSCILLATOR
AND
DIVIDERS
XTAL/CLOCK
Rx BIT/CLOCK
EXTRACTOR
Tx
Rx
VBIAS
T
FX909A Features
• Half Duplex GMSK Operation
[Tx BT = 0.3]
• Flexible Frame Structure
[Mobitex and Custom Frame Formats]
• Automatic Protocol Handling
[Bit and Frame Sync, Block Formatting, CR
FEC, Interleaving and Scrambling]
• 4000b/s to 19200b/s Operation from a Cho
Xtal/Clock Frequencies
FX909A Features ......
• Low Power; Single 3 to 5.5 Volt Supply
[2.2mA from 3.3 volts] with Powersave
• Data Interleaving and Scrambling
• Rapid Rx Signal Acquisition and Tracking
• Received Data ‘Quality’ Monitor
• Parallel µController Interface
FX909A ‘Mobitex’ Protoco
FX919A and FX929A Introdu
Two separate half duplex 4-Level FSK packet data modem
FM wireless data links. These two products individually co
baseband signal processing functions to handle the lower la
LAP and general purpose 4-level packet data air interface p
each is programmable to operate at most standard bit rates i
4800 to 19200 bits per second (2400 to 9600 symbols per s
wide range Xtal/clock frequencies.
• FX919A General Purpose Protocol
• FX929A RD-LAP Protocol
FX919A and FX929A
4-Level FSK Wireless Modem Dat
STATUS
REGISTER
IRQ
DATA
QUALITY
REGISTER
8
E CAF RET NI
RELL ORT N OCµ
VDD
D0
D1
D2
D3
D4
D5
D6
D7
DATA
BUS
BUFFERS
WR
RD
CS
A0
A1
ADDRESS
AND
R/W
DECODE
COMMAND
REGISTER
MODE
REGISTER
CONTROL
REGISTER
DATA
BLOCK BUFFER
CRC
GENERATOR/
CHECKER
FEC
GENERATOR/
CHECKER
Symbols
FRAME
SYNC DETECT
INTERLEAVE/
DE-INTERLEAVE BUFFER
VBIAS
VSS
Rx Symbols
Tx Symbols
Rx Fb
DO
Tx
Rx
VBIAS
Rx IN
XTAL
Rx
-
Rx SYMBOL/CLOCK
EXTRACTOR
R R C
FILTER
DO
Rx Input Amp
Tx
CLOCK
OSCILLATOR
AND
DIVIDERS
RxEYE
Tx
Rx
VBIAS
XTAL/CLOCK
Tx Output
Buffer
T
FX919A and FX929A Featu
• Half Duplex 4-Level FSK Operation
• Data Rates of 4800b/s to 19200b/s Operat
Choice of Xtal/Clock Frequencies
• Full Data-Packet Frame Handling
• Low Power; Single 3 to 5.5 Volt Supply
[2.5mA from 3.3 volts] with Powersave
• Rapid Rx Signal Acquisition and Trackin
• Received Data ‘Quality’ Monitor
• Data Interleaving
FX919A and FX929A Feature
• Error Detection and Correction
• 8-Bit Buffered Parallel µC Interface
• Compact 24-Pin Packages
FX929A Protocol
Header Block
Station ID
msb
lsb
7 6 5 4 3 2 1 0
System ID
Byte 0
7 6 5
4 3 2 1
Intermediate Blocks
0
7 6 5 4 3 2 1
Last Block
0
7 6 5 4 3 2 1 0
Byte 0
Byte 1
Domain ID
Byte 1
Byte 2
Byte 3
Base ID
CRC0
Byte 2
Data bytes
(0 - 8)
Address
&
Control
Byte 3
Byte 4
Data Bytes
(12)
Byte 5
Pad bytes
(0 - 8)
(10 bytes)
Byte 6
Byte 7
Byte 8
Byte 9
Byte 10
Byte 11
7
0 7
Byte 0
0 7
Byte 1
2
Byte 3
0 7
Byte 2
CRC2
(4 bytes)
CRC1
(2 bytes)
0
7
0 7
Byte 0
0
7
Byte 1
0
Byte 11
'000'
'000'
0
1
2
9
8
10
tri-bits
0
1
2
FEC TRELLIS CODING / DECODING
( ERROR CORRECTION )
0
1
20
3
4
5
29
30
31
32
FEC TRELLIS CODING / DECODING
( ERROR CORRECTION )
4-lev el
sy mbols
21
0
1
2
64
65
INTERLEAVING / DE-INTERLEAVING
Block:
Over-air
signal
(symbols)
SYMBOL
SYNC
24
FRAME
STATION
S
S
SYNC
ID
24
1
'HEADER'
BLOCK
1
22
22 symbols
S
INTERMEDIATE BLOCKS
69
69
S
22 symbols
'LAST'
BLOCK
FRAME
SYNC
22 symbols
69
S
69
PACKET (1 TO 44 BLOCKS)
FRAME
PREAMBLE
NEXT FRAME
(OPTIONAL)
FRAME
'S' : Channel Status Symbol : +3 = Busy
+1 = Unknown -1 = Unknown -3 = Idle
Frame Sync:
-1
+1
-1
+1
-1
+3
-3
-3 +3
+3
-3
+3
-3
-1
+1
-3
+3
+3
-1
-3 +3
+3
-3
-3
+3
+3
-3
+1
-3
-3 +1
+3
-1
-3
+1
+3
-3
-3
-3
+3
+3
Symbol Sync:
+3
+3
-3
sent first
-3 +3
+3
-3
last
EV9000 Evaluation Kit fo
FX909A, FX919A and FX92
Modem Data Pumps
An evaluation kit designed to demonstrate and investigat
facets of the FX909A, FX919A and FX929A modem dat
allow dynamic evaluation of the products.
The kit consists of a PCB containing a pair of ‘FX’ modem
together with associated components, enable messages to be
one modem and received by the other. Using the signal con
the EV9000 can be integrated with an RF system.
The EV9000 is supplied with software which enables the form
content and modem operation to be controlled via a Micro
environment on a PC. The kit, which includes a PC in
complemented by a comprehensive instruction manual.
EV9000
Evaluation Kit
EV9000 Features
• PCB-Based Operating Under MS-Windo
(PC) Environment
• Software Control
• Choice of Clock Xtal
• Choice of External Noise Sources
• Independent Modem/Host Operating Vol
• Signal Offset and Amplitude Adjustment
• PTT Output and Carrier Sense Input Cap
• Access to All Modem Pins
Competing Solutions
Comparison with Digital Signal Processing
• Less supply requirement
FX9x9A Series = <12mW
DSP =
>200mW
• FX9x9A Serie
Complete and
DSP requires c
hardware and s
• FX9x9A: Small single
package
DSP: Several IC packages
required
• DSP system re
development ti
Competing Solutions ......
Comparison with Digital Signal Processing
• Less pcb area
• Price differenc
FX9x9A Series = <45sq.mm
FX9x9A Serie
DSP =
> 45sq.mm
approx. $10
DSP
approx. $40 +
• FX9x9A: Few extra passive
components and very little
support
• DSP requires h
support for bot
and software
FX909A, FX919A and FX92
Applications
• ‘Mobitex’ and ‘RD-LAP’ Type Data-Installatio
• High-Speed Data in Narrow-Band Radio Chann
• ‘Mobitex’, ‘Ardis’, ‘Modacom’ and ‘RCR STD
Packet Systems
• Telemetry, LAN and WAN Database, Stock Co
Alarm Systems
CML Modem Data Pump
Products ...... to date
• FX429A FFSK Modem
• FX469 1200/2400/4800 Baud FFSK Mode
• FX529 FFSK Modem
• FX579 Half Duplex GMSK Modem
• FX589 GMSK Modem
• FX604 CCITT V23 Compatible FSK Mo
.......
...... CML Modem Data Pum
Products ...... to date
• FX809
FFSK Modem
• FX909A GMSK Packet Data Modem
• FX919A 4-Level FSK Packet Data Mod
• FX929A 4-Level FSK RD-LAP Modem
• FX949
Formatted CDPD Modem
• FX959
Multi-Mode GMSK Modem
Click below to find more
Mipaper at www.lcis.com.tw
Mipaper at www.lcis.com.tw

FX909A, FX919A and FX929A GMSK and 4

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