motorola semiconductor product information MC68181 order this doc u ment b y: MC68181p/d ?1997 motorola, inc. product preview this document contains information on a product under development. motorola reserves the right to change or discontinue this product without notice. preliminary MC68181 roaming flex? chip ic roaming flex? protocol is a multi-channel, multi-speed, high-performance protocol adopted by leading service providers worldwide as a de facto roaming paging standard. roaming flex protocol gives service providers the increased capacity, added reliability, and enhanced pager battery performance needed today, coupled with the ability to control a pll synthesized receiver to receive paging messages from a list of paging channels. it also provides an upward migration path to the service provider that is completely transparent to the end user. the MC68181 roaming flex chip ic is part of a total solution available from motorola for providing roaming flex capabilities in a low-power, low-cost system. the roaming flex chip simplifies implementation of a roaming flex paging device by interfacing with many standard paging receivers, and host microcontroller/microprocessors. the primary function of the roaming flex chip is to process information received and demodulated from a radio paging channel, select messages addressed to the paging device, and communicate the message information to the host. the host interprets the message information in an appropriate manner (numeric, alphanumeric, binary, etc.) and handles all the i/o activity. the roaming flex chip ic also operates the paging receiver in an efficient power consumption mode and enables the host to operate in a low power mode when message information for the paging device is not being received. figure 1 roaming flex chip ic functional block diagram 76.8 khz osc clock symbol sync sync correlator de-interleaver address receiver noise detector internal control error local msg filter spi buffer spi control/status registers unit external comparator control exts0 exts1 symclk xtal extal clkout s0Cs7 v dd v ss test reset lobat ready spi 8 4 control unit corrector aa0813 preliminary 06/11/1997
2 MC68181p/d, preliminary motorola MC68181 flex chip features preliminary flex chip features ? roaming flex paging protocol signal processor ? sixteen programmable user address words ? sixteen fixed temporary addresses ? sixteen operator messaging addresses ? 1600, 3200, and 6400 bits per second (bps) decoding ? any-phase or single-phase decoding ? uses standard serial peripheral interface (spi) in slave mode ? wide operating voltage range from 3.3 v down to 1.8 v ? allows low current stop mode operation of host processor ? highly programmable receiver control ? real time clock time base ? flex fragmentation, and group messaging support ? real time clock over-the-air update support ? compatible with synthesized receivers ? ssid and nid roaming support ? low battery indication (external detector) ? 32-pin thin quad flat pack (tqfp) package ? backward compatible with standard flex chip signal processor mc68175 ? operating temperature range 0o to +70oc (32o to 158of) flex chip system design the roaming flex? chip ic connects to a receiver capable of converting a 4-level audio signal into a 2-bit digital signal (see figure 2 ). the flex chip ic has eight receiver control lines used for tuning, warming up, and shutting down a receiver in stages. dual bandwidth control signals for two post-detection filter bandwidths are used for receiving the two flex symbol rates. the flex chip interfaces to a back-end host mcu through a standard spi, and provides a 38.4 khz clock output capable of driving other devices. it has a 1 minute timer that offers low power support for time of day function on the host, and the ability to detect a low battery signal during the receiver control sequences. all data communicated between the flex chip ic and the host mcu is transmitted on the spi in 32-bit packets. each packet consists of an 8-bit id followed by 24 bits of information. the flex chip ic uses the spi bus in full duplex mode, so whenever a packet communication occurs, the data in both directions is valid packet data.
MC68181 flex chip system design motorola MC68181p/d, preliminary 3 preliminary flex protocol flex system software from motorola is a family of software components for building world- class products incorporating messaging capabilities. flexstack? software is specifically designed to support the flex chip ic. it runs on a products host processor and communicates with the flex chip ic, fully controlling the receiver subsystem and interpreting the code words that are passed to the host from the flex chip ic. flex protocol offers more than 10 times the data capacity of a pocsag 512 bps system, and at least 12 times the fading protection. flex protocol operates at 1600, 3200, and 6400 bps, allowing a system to increase capacity as demands increase, without replacing or reconfiguring the pager units. flex protocol is synchronousall data intended for a particular pager is scheduled in pre-defined time slots, so the receiver and host processor are only active when messages are scheduled for delivery. roaming flex protocol roaming flex provides the ability to tune the receiver circuits into the required paging channel. this allows roaming in areas serviced by transmitters using different frequencies, or load balancing and reallocating where multiple frequencies are used to serve a single area. when first acquiring a flex signal, the receiver is stepped through frequencies in the scan list, and the signal checked for flex information. the roaming software checks the network identifier (nid) and simulcast system identifier (ssid), to determine the correct channel(s) to lock onto. during idle frames, other channels may be scanned for the presence of flex signals and alternate channels. flexstack software also captures traffic management flags, assisting load management by shifting groups of subscribers between channels. figure 2 roaming flex receiver block diagram lna mc3374 mc13150 mixer/amp mmbr961lt1 mr947t1 mc13143 data frequency synthesizers spi mrf1047t1 mrf927t1 mrf947t1 mrfic0916 mrfic0915 mrf947t1 mrf927t1 mrf2947at1 mc141592 MC68181fdb flex tm subsystem MC68181 fsk rf in 2/4 level rec audio aa1216 mc68hc08 mc68hc11/12 mc68328 mpc821 dsp56l811 2-bit fm if adc spi pll vco/buffer host processor if stages flex tm a/o
preliminary motorola reserves the right to make changes without further notice to any products herein. motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. typical parameters which may be provided in motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including typicals must be validated for each customer application by customers technical experts. motorola does not convey any license under its patent rights nor the rights of others. motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support life, or for any other application in which the failure of the motorola product could create a situation where personal injury or death may occur. should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that motorola was negligent regarding the design or manufacture of the part. motorola and are registered trademarks of motorola, inc. motorola, inc. is an equal opportunity/affirmative action employer. how to reach us: usa/europe/locations not listed : motorola literature distribution p.o. box 5405 denver, colorado 80217 1 (800) 441-2447 1 (303) 675-2140 mfax? : rmfax0@email.sps.mot.com touchtone (602) 244-6609 usa and canada only: 1 (800) 774-1848 asia/pacific : motorola semiconductors h.k. ltd. 8b tai ping industrial park 51 ting kok road tai po, n.t., hong kong 852-26629298 technical resource center: 1 (800) 521-6274 dsp helpline dsphelp@dsp.sps.mot.com japan : nippon motorola ltd spd, strategic planning office 4-32-1, nishi-gotanda shinagawa-ku, tokyo 141, japan 81-3-5487-8488 internet : http://www.motorola.com/sps product documentation the manual listed in table 1 is required for a complete description of the MC68181 and is necessary to design properly with the part. documentation is available from a local motorola distributor, a motorola semiconductor sales office, a motorola literature distribution center, or through the motorola dsp home page on the internet. flex, flexstack, and mfax are trademarks of motorola, inc. table 1 additional documentation document name description order number MC68181 technical data MC68181 features list and physical, electrical, timing, and package specifications MC68181/d
|
