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CT1995-20 Datasheet(PDF) 9 Page - Aeroflex Circuit Technology |
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CT1995-20 Datasheet(HTML) 9 Page - Aeroflex Circuit Technology |
9 / 25 page Aeroflex Circuit Technology SCDCT1995 REV A 11/21/01 Plainview NY (516) 694-6700 9 DWSYNC SOURCE Data Word Sync - This line goes low if a data word sync and two Manchester biphase bits are valid. CMSYNC SOURCE Command Word Sync - This line goes low if a command word sync and two Manchester biphase bits are valid. NDRQ SOURCE No Data Required - This line goes low if the encoder transmit buffer is full i.e. another word is going to be transmitted. This signal is for information only and must not be used to enable data from the subsystem. PASMON SINK Passive Monitor - When functioning as a Bus Controller this line acts as a passive monitor select. The active going edge of this line will cause the REQBUS lines to be latched and that bus, now selected will be monitored so long as PASMON remains low. All traffic on the bus will be handed, after validation, to the subsystem via STATSTB for status and commands words, and RMDSTB for data words. BCOPSTB SINK Bus Controller Operation Strobe - When functioning as a Bus Controller a low going pulse on this line will initiate the selected bus controller operation on the requested bus, using BCOPA&B and REQBUSA&B. BCOPA SINK Bus Control Operation A - Least significant bit of the bus controller operation select lines. BCOPB SINK Bus Control Operation B - Most significant bit of the bus controller operation select lines. REQBUS A SINK/SOURCE Request Bus A - This line,wwhen in RT mode, is the least significant bit of the bus request lines which specify the origin of the command, ie. they are sources. When in BC mode these lines are sinks and specify which bus is to be used for the next command. REQBUS B SINK/SOURCE Request Bus B - Most significant bit of the bus request lines. (See above for description.) RT/BC SINK Remote Terminal/Bus Control - This line when high causes the ASIC to function as a remote terminal. When low the ASIC functions as a bus controller or passive monitor. DBCACC SINK Dynamic Bus Control Accept - This line should be permanently tied low if a subsystem is able to accept control of the bus if offered. LTFAIL SOURCE Loop Test Fail - This line goes low if any error in the transmitted waveform is detected or if any parity error in the hardwired RT address is detected. ERROR SOURCE Error - This line latches low if a Manchester or parity error is detected. It is reset by the next CMSYNC (RT mode) and also by RTO in the BC mode. RTO SOURCE Reply Time Out - This signal will pulse low whenever the reply time for a transmitting terminal has been exceeded. This line is intended for the bus controller use. TXTO SOURCE Transmitter Time Out - This line goes true if the transmitter time out limits are exceeded. PARER SOURCE Parity Error - This line will pulse low if a parity error is detected by the decoder. MANER SOURCE Manchester Error - This line will pulse low if a Manchester error is detected by the decoder. Pin Description (Cont.) Signal Hybrid Sink or Source Signal Description |
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