Sci SCi Systems, Inc. 5242300 ARINC 629 SERIAL INTERFACE MODULE (SIM) interfaces To All Current Mode Couplers (CMC) (SCI P/N 5242500) Supports Stub Lengths to 40 Meters High Speed Operation (Transmit P, < 39 ns) Transmit Integrity Checking wi Wrap Around Signal Monitoring Power Control for Coupler wi Over-Current Protection Manages Coupler Redundant Channel Selection Fault Detection, Isolation and Reporting Capabilities Self-Test Capabilities 28 Pin Double-Dip Package MIL-H-38534 Screened oOo oO Dp ODP oa oa at wo Theil jaa af : z 5 g & 5 = a aa Fig 1. 5242300 Block Diagrams Fig 8242300 Pin DescriptionSCI GENERAL OVERVIEW 5242300 The 53242300 Serial Interface Module (SIM) interfaces the Terminal Con- troller and 103 associated subsystem to the Current Mode Coupler (SCl# $242500). The SIM and Coupler interface provides the user the capa- bility to operate a twisted pair current mode serial data bus per the ARINC 629 standard. The SIM provides high speed Manchester to doublet logic encoding for transmission to the coupler over the stub interface and performs high speed Manchester regeneration of the data bus traffic received from the coupler. The SIM controls the modes of opera- ton of the cunment mode coupler by monitoring the dowblet signals it transmits to the coupler and thase sig- nals transmitted on the teisted wire data bus by the coupler. In the event of a faulty transmit signal in the primary channel of the coupler, the SIM will instruct the coupler to switch to a sec- redundant transceiver channel. Should a SI transmit failure occur, the SIM will disable further attempted transmission until a nsing and follow- ing transition of TRHB has occurred. The SIM controls power to the coupler and will remove power from the coupler inthe event of an overcurrent comdition. Table 1. PIN DESCRIPTION: PIN BAME Wi) PIN FUNCT TSA TRANSMIT STUB A TSB TRANSMIT STUB B: The cansmit stub pair TSA & TSB are connected to tee current mode coupler via a stub cable. The transmit dada is sent from the STM bo tbe Comper a differential voliage dowblets over this pair. A common mode village Hf euher+15 or -15 is also sen lo the coupler over (his pair io provide poveer bor ts operuie, TRANSMITTER OUTPUT: This is TTL transmit daa from the terminal controller. The Manchester encoded data is asynchronously converted to doubler blogic for rarcmissicns to the Conment Mode Coupler via TSA & TSB. 27 TRANSMITTER ENABLE: This signal is used bby the lanmninal controller ie enable ike cansmilung of the doubles ante the transmit stub pair, TRHE ri TRANSMITTER INHIBIT: This control line is deacti- vibed only during actual data transmissions, Coniolles) by ihe Terminal Controller. RSA i? RECEIVE STUB A RSE 3|6 18 RECEIVE STUB B: The data bus traffic from the coupler is received by the SIM fron ihe coupler over the RSA & RSH signal pair as differential voliage dowblets, The STM also sends acommon mode voltage of cither+15 and -13 Lede coupler via RSA & RSE wo provide power for the coupler, /RXE 14 RECEIVE ENABLE: The output signal lincs RAT & RAN are inelabed unless JR XE is held low. 15SCl 15 3242300 Table 1. PIN DESCRIPTION (cont.) PIN KAME: ity FUNCTION RACK 13 RECEIVE DATA CLOCK: This chock is the receive dain dock which is extracted fram the incoming bil stream and is generated by the Terminal Controller. Its frequency twice the incoming bit raw. (RXCK = 4Mhz for FMbi Implemwentalicn, | RAl o RECEIVER OUTPUT RAN 1a RECEIVER OUTPUT SOT: The output signal lines RX! & tpn mht ibe ane oa - iwo-line Manches- ter biphase, compatible: which is repeneraved from the incoming dowblets eo the Terminal Conmoller, Bus quiet conditions of the current mode data bus ane indicated by both dulpul lines pong low. CTHA 16 COMPARATOR THRESHOLD A 19 COMPARATOR THRESHOLD B: The conurel signal lines CTHA & CTHE are used to central tbe STM receiver input doubtet threshold, Grounding both pins sets the: input Lireshold for the higher noise immunity condition, Both pins high select che lower input threshold condition, Both Ee required bo be in the sane state or the STM tramsmit dizabhed. (Nic = HIGH) {BTC BITE COMMAND: The fallin ey BTC asserts the: BITE (Bult [n Test) sequence. tise ale 2). (BSE BITE STATUS ENABLE: Enables the BITE STATUS OUTPUTS BS0 & BS1. A high on /BSE tistics the stains ouipuls. BS0 o BITE STATUS 0 BS] BITE STATUS 1: The status lines BS0 & BS1 are used wo Indicate the status of ihe SIM and dhe two redacted chan- nels in the coupler, The states indicates the results of the most recent RITE command. (Sec Table 2). The BITE command and status lines are used by the subsystem and are mid used) by ihe Terminal Coneroller. Nia NEGATIVE 15 OUT: This -15 rail ic supplied by the SIM for those applications requiring a receive only mode of opcraibon by ihe SIM ACoupler interface. The W150 is comdi- lanied by he SIM and is condrolled for overcurrent condi- inns, The transmit stub TSA & TSE are tied io M150) for receive only operation, +5 a +6 VDC: Pina 23 & 28 ane boll required! to be connected to +54, sa Se Pins 23 & 28 are both required wo be commected wo +5. #15 20 +15 VOC -15 PWR at 15 VIR GND GND 4 11,21 GROUND: Pins 4, li & 21 are all three required i be commected to PICK preamd. NC i NO CONNECT: These pans are oot io be conmected.5242300 SCl OPERATION The 5242300 Serial Interface Module is used in conjunction with a Current Mode Coupler (SCI 524250) to inter- face a Terminal Controller to the ARINC 629 coment mode data bus. The Terminal Controller transmits Man- chester biphase data to the SIM, DATA TRANSLATION AND TRANSFER Transmit The current mixde data bus requires that the transmit digital information be converted to an AC signal in order to be transmitted over the bus. This is achieved in the SIM by converting each transition of the transmit biphase Manchester data from the terminal into a doublet. This is then sent by the SIM to the coupler (via TSA & TSB) for transmission ante the cunrent mode data bus. A voltage doublet is defined as balanced differential signal made up of a pair of positive and negative voltage excursions (fig. 3). The doublet excursions are 62.5 nanoseconds wide with a differential amplitude of approximately 4.5 volts. The SIM performs the data translanon and the transfer functions required for bidirectional interfacing to the current mole coupler connected to the twisted wire data bus, The SIM has three main functions: 1) Data Translation and Transfer, 2) Coupler Mode Control and 3) Fault Management and BITE. The 51M performs the high speed logic translation in less than 30 ns typically. The SIM monitors the transmission of each doublet to the coupler for proper amplitude and symmetry. Should the transmit monitoring circuitry of the SIM detect a faulty transmit doublet the SIM will indicate a transmit failure and inhibit the transmit function (See Fault Management & BITE). This is to insure that the terminal interface does not corp the data bus with inaccurate signaling. The transmitted doublets are also monitored by the SIM on the receive section to evaluate the per- formance of the coupler transmit furec- tion (See Receive, Coupler Mode Control), i Figure 3. 5242300 SIM Transmit Doublet =--jp 4 - a Vio 195Receive Tee The SIM receives voltage doublets from the coupler as they are picked up from the twisted pair data bus as current doublets. Although the couplerrecelver isan active amplifier, it has a fixed gain. Therefore, the amplitude of the doublet received by the 51M from the coupler is indicative of the bus doublet amplitude. It is this feature, along with the fact that the coupler receives its own transmit onte the data bus, that allows the SIM to perform data bus signal analysis of its own transmitted signal. (See Fault Management & BITE). The 5IM ana- lyzes each incoming doublet and checks the signal for the proper waveform symmetry and amplitude. The accept- able amplitude is determined by whether the signal was a result of the couplers own transmit of whether it was data from a distant terminal. The receive doublets from distant terminals are required to satisfy one of two amplitudes depending on the status of 5242300 the CTHA & CTHB control lines. This allows for those ARINC 629 systems with few couplers and shorter bus lengths to be configured for higher noise immunity. In order to reduce delays in the data translation and transfer function the SIM regenerates the Manchester biphase data transition tothe Terminal Controller as soon as the incoming dowblet is detected. Should the doublet turn out to be defective or emoncous the SIM will suppress the next two transitions of the incoming Manchester data. The Terminal Con- troller will detect that the transitions have been suppressed. The SIM determines the end of a message on the twisted wire data bus by counting four (4) consecutive rising edges of RACK clock without the receipt of a doublet from the coupler. The SIM will then assume a bus quiet condition (RXI & RAN low). Fr erro 1 oy = H oe eS i Figure 4, 5242300 SIM Receive Doubletat E 5 5242900 AA, Figure 5. SIM Doublet Signaling Power Control The SIM controls and monitors the fone used by the current mode cou- The 1s VDC is powered by +15 ao and -15 YOC supp ly rails that are supplied via the stub Seatac: cable, The voltage rails are supplied to the coupler as common mode voltages on the transmit and receive signal pairs. The SIM determines which voltage rail to place on which stub signal pair based on the desired mode of operation of the current mode coupler. (See Coupler Mode Control). The SIM monitors the power con- sumption of the coupler for overcurrent conditions, Should an overcurrent condition occur the voltage rails are removed from the coupler until the SIM is Tesct via a positive edge of TRE or RXE, The over curent concition 1s defined as a continuous current drain of T30 milliamps for 32 usec. Although the coupler does not use ground the SIM can detect both rail to rail or rail to ground shorts. ARING 628 LAU Figure 6. 5242300 SIM Application 15Ci FAULT MANAGEMENT & BITE Fault Detection The SIM constantly monitors the operation of the SIM and Coupler to insure the integrity of the data that is transmitted on the twisted wire data bus. The SIM checks its own transmit as it is sent to the coupler to insure that sig- naling is of sufficient amplitude and symmetry. Should a failure occur in the SIM transmit signaling then the SIM will temporarily disable the SIM transmitter and log the error for BITE inquiries. The SIM will attempt to transmit data again following the next nsing and falling edge of TRHB. The SIM monitors all receive signaling for proper amplitude and intradoublet gap time. However, when the SIM is transmitting doublets to the coupler, the doublets received by the SIM from the Coupler are treated differently than doublets received from distant termi- nals. The difference between doublets received from distant terminals and thease that are received) as a result of the SIMs own coupler transmit is the amplitude requirements that must be met. Distant terminals may be located 5242300 upto lkimeters away and the SIM must be able to detect the lowest amplitude Of a worst Case transmitting coupler. The normal threshold for receive dow- blets at the SIM is 7(R) m {unless modified by CTHA & CTHB). As the SIM*s own coupler transmits doublets (as indicated by TRHBE being low al the SIM ) the signals are immediately sensed by its receiver and are sent on to the SIM with much larger amplitudes. These wraparouml doublets are required (0 satisfy a higher voltage threshold in onder to be considered acceptable (1400 m). The data bus signaling amplitude is critical to insure that the signal is being received with sufficient amplitude ata distant coupler. In the event that the SIM detects that faulty doublets are being transmitted onto the data bus, the SIM will request that the coupler switch to a redundant secondary transceiver channel. The SIM signals the coupler to utilize the backup channel by transmitting dow- blets of the opposite phase tothe coupler on the TSA-TSB signal lines. Built in Test (BITE) CONTROL INPUTS | STATUS OUTPUTS | SYSTEM STATUS /BSE BTC BS1 BSO O x 0 0 Coupler Fault Oo % O 1 1 Good Channel 0 1 1 0 2 Good Channets 0 x 1 1 No Test 1 x Hi-Z Hiez No Test Mote 1: the BS(1:0) are read alter 3 transmit intervals (TI's) and TXE has gone Kew and (heir valine is 17 then this gives indication that a SIM fault has baan datectad indapendaent of any olher/BTC resultant Slalu 5 Table 2. SIM BITE Status CodesSCl Ee 5242300 FAULT MANAGEMENT & BITE (cont) Coupler Mode Control The SIM has the ability to control the mode of operation of the coupler in two ways. First, the SIM can configure the coupler to use a secondary transceiver channel if the SIM detects a fault with the primary. This is done by transmit- ting doublets of opposite phase to the coupler (see Figure 8). Secondly, the SIM can configure the coupler in a receive only mode of operation. This is done by reversing the common mode voltages that ure sent to power the coupler via the transmitand receive stub signal pairs. Table 3 indicates the var- iows SIM and coupler modes of opera- tion. The SIM will automatically man- age the coupler mode of operation, The subsystem weer can obtain SIM and coupler status information by executing the Built In Test (BITE) capabilities of the interface. The BITE sequence is executed by activating the /BTC signal. The SIM will perform the test on the SIM and both of the channels in the coupler and report the results via the BS0 & BSI status bits. The time required for the SIM to execute the BITE sequence may require more than one TL (Transmit Interval) to execute. The SIM will report no test" until the sequence is complete as indicated in Table 2. SIM TRANSMIT FUNCTION & COUPLER MODE CONTROL = OF an CONTROL INPUTS | INTERNAL STATUS CONTROL STATUS THE TXHE | /AXE Sik COUPLER SIM TRANSMIT COUPLER FAWILT FAULT FUNCTION POWER 1 o x o o Enalbled' Marral* 0 bi 0 x x Disabled* Ficv Oniy* 0 x 1 x x Disabled Linit OFF x 1 x x x Disabled mole & x x O 1 x Disabled Rev Onily x x 1 1 x Disabled Unit Oi x x O x 1 Digehled Ricy Oily x x 1 x 1 Disabled Unit Ott NOTES: : . 1, Enabled indicates thal the SIM will transrrat doublets to the coupler via the stub cable. 2. In Normal operation +15 VOC is sant tothe coupler via TSA-TSB and -15 VOC is sent via ASA-ASB-. 3. The transmit function is disabled and no doublets will be generated. 4. The coupler is placed in receive only mode by supplying +15 VOC fo the coupler via ASA-ASB and -15 VOC via TSA-TSB. (Reverse of normal) . The SIM completely removes coupler power from the stub Gable. . Dependent on state of TXE, AXE. . Internal status only, not available at SIM external pin interlace Table 3. SIM Transmit Function & Coupler Mode Control a5Sci 5242300 The internal status lines are those con- trol signals within the SIM which are used in conjunction with the external control inputs to determine allowance of SIM transmit and coupler power. A SIM fault is declared if an internal transmit enor flag has been set by the fault management logic when a falling edge transition of TXE is seen. A cou- pe fault is set by the fault management ogic after it has executed unsuccessful sequences of transmission on both channels. ABSOLUTE MAXIMUM RATINGS* Case Temperature ......... 40C to 125C Storage Temperature .... 65C to +150C Vou on Any Pin wah to Ground ..... -1.0V to FV "Nobo: Stresect above those leted wider Absolute Klasiouim Rating mary cause per- manecnd to ihe device. This is a stress. faling only and functional operation of the deweoe al these or any olher condemns abiwe lhose indicated in the operons sections of his specification is mot implied. Exposure bo absolute maximum raling concdiaons for exlemied perncak may wlect device relishalaty. NOTICE: Specifications contained within the following tables are subject to change D.C CHARACTERISTICS T, = -40C to +125C, V,, = 5V 15% Symbol Parameter Min Max Units Test Conditions Vi Input Lowe Viele 0.8 Ww Win Input High Voltage 2.0 Vf Vow Quipul Low Voltage 0.45 Vo ila = 4.8 mA Vv Quiput High Voltage 24 Vo dle. =-1.3 mA i Vor Oud low = 100 WA l, input Low Curren -0.2 mA |Woo = Max, l= 0.4 YDC I, Input High Current 25 uA | Voc = Max, Vl = 2.7 VOC hy Output Low Gunrent 24 ma lets Output High Current ah mA, F Input Leakage Current +10 uA |OVe Vo = VL Ce Outpul or lO Capacdance 15 pF le Power Supoly Currant Continuows Transmit +5 20 mA | Worst Case 2MHz Manchester Data Les +15 20 mA& | Ooes Wot Include 15 20 mA PCMC Current, 25% 1355242300 scl A.C CHARACTERISTICS T, = -40C to +125C, V_. = SV 25% Symbol Parameier Mir Max Units Test Conditions Vos tsar Peak Amplitude, 11 45 6.0 V TSA-TS6 Differential Vee Transmit Negative Peak -3.9 6.0 Vo |TS4-TSB Difterential te Time, page 1 (+7,0 fo 43.6) a.f5 11 ns Le Time, Bdge 2 (+3.6 fo -3.6N) 6.2 19.9 ng tea Time, Edge 3 (-3.6 to -1,.0) 5 16 ng hy Transmit Width, 1st lobe, 69.16 7O.3a7 ns bower (47.0) is Tramsmil Width, 2rcd lobe, 64.09 71.82 ns bower (-7,0) ba Transmit Width, 1st lobe, 46.14 60.8 ns upper (43.6) lee Transmit Width, 2ref lobe, 42.97 60.4 ns upper [-3.6) L, Transmil Goublet Width (+7.0' 129.0 138.58 ns bo -1.0') i Transm Propagation Delay ag nS | Measured to 10% Point of first Halt Doublet ies Receive Propagation Delay 36 nS | Measured from first lhreshold crossing to Manchesiar ragener- alion pe LAU UUUUUTL = 44 44 $1, Figure 7. SIM Transmit Function is. La RAINY Belciies ree Shr -- - Soe Figure & SIM Coupler Channel Select 10 Ws5242300 la SIM PACKAGING: MECHANICAL OUTLINE 28 PIN DOUBLE DIP aa r pete pi lest | Pathe ibemmesenend,. inva aa +|_.8 +.002 > 250 1000 ____ sai om = : ~ Pin Ky rpere | ooo0ooco og 0 Oo 0 G00 CL Are Pes Raters 1s 20 = (BOTTOM VIEW) 600 +.004 | id 1 a + | In. J eal Cortramtirg 100 Typ Colior Mand NOTES: 1. Dimensions shown are in inches with tolerances to two or three places 2. Lead identification numbers are tor reference only 3. Lead cluster shall be cantarad within 0.010 ol outline dimensions. Lead spacing dimensions apply only al sealing plane. 4. Pin material meets solderability requirements of MIL-STD-202E, Method 208C or MIL-STD-8830 EL Package Is Nickel Plated Kovar. &. Quality Assurance Program - Boeing 01-3000 Figure . SIM PACKAGING OUTLINE = "1] 5242300 SCI For additional information contact: SC] SYSTEMS P.O. BOX 1000 M/S 240 Huntsville, Alabama 35807 Telephone: (256) 882-4569 FAX: (256) 882-4652 12 1H