Service Manual - AMS Neve

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SynchroNet ES/2 Service Manual CIRCUIT DESCRIPTION FIFO empty FIFO read Background FIFO write Background FIFO not empty end Message to be sent All characters sent Construct message All chars received Interpret message Write characters to FIFO FIFO empty Figure 6 : FIFO software diagram. FIFO full FIRQ generator The FIRQ line on a 6809 microprocessor is the second of three interrupt lines, NMI and IRQ being the other two. It is used in the ES/2 for scheduling various software routines including : Polling the keys. Tach timeout. Diagnostic port processing. Checking video periods. FPGA SPLIT (U38) contains the firq generator. It simply counts the main system ‘Q pulse’ and generates a low going pulse on the FIRQ line after 5ms. The firq subroutine then cancels the low level by writing to a location which clears the output latch. Issue 1 1:11
CIRCUIT DESCRIPTION SynchroNet ES/2 Service Manual MACHINE INTERFACE. The ES/2 machine interface is capable of controlling a wide range of audio, video and film machines. The circuitry for which can be split into the following sections: Commands and tallies. Tach interface. Servo. Serial machine interface. Sony 5000 shuttle control. Commands and Tallies command outputs Command relays relay latch en_op servo n/o servo com servo n/c servo relay s_rly Kernel microprocessor TPOL fpga : SPLIT tally inputs OPTO isolators Tally buffer Figure 7 : Command output and tally input. Figure 7 shows a block diagram of the command and tally interface. There are 8 command relays used for transport commands : PLAY, STOP, RECORD, FORWARD WIND, REWIND, PAUSE, REHEARSE and LIFTER DEFEAT. Each relay has a common reference (CMDREF) which goes to the parallel machine connector to allow each interface to connect the reference to a level suitable for the machine to be controlled. An independent change-over relay is provided for switching servo enable signals. The KERNEL microprocessor controls the relays via a 74HC377 octal latch (U25), the outputs of which drive the relays through an open collector driver. The relay outputs are disabled during power up by Q2. The microprocessor enables them by setting the EN_OP line low. The servo relay (K7) is separate from the command relays and is driven by the S_RLY line generated by the FPGA SPLIT. The ES/2 is capable of reading 4 tallies from the machine : RECORD, End of Tape, RECORD ENABLE and spare. Each tally input is fed into 2 opto-isolators whose common go to the parallel machine connector to allow the ES/2 to read tallies of either sense. The outputs of the optos can be read by the KERNEL microprocessor via the tally buffer - U21, a 74HC374 - also used to read the 1:12 Issue 1
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Page 5 and 6: CIRCUIT DESCRIPTION SynchroNet ES/2
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Page 33 and 34: ES/2 TEST SOFTWARE SynchroNet ES/2
Page 53 and 54: MACHINE PARAMETERS SynchroNet ES/2
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MACHINE PARAMETERS SynchroNet ES/2
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APPENDIX A SynchroNet ES/2 Service
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APPENDIX A SynchroNet ES/2 Service
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APPENDIX B SynchroNet ES/2 Service
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APPENDIX C SynchroNet ES/2 Service
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Index SynchroNet ES/2 Service Manua
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Service Manual - AMS Neve

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