Service Manual - AMS Neve
Service Manual - AMS Neve
Service Manual - AMS Neve
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SynchroNet ES/2 <strong>Service</strong> <strong>Manual</strong><br />
CIRCUIT DESCRIPTION<br />
Serial machine control<br />
drx_232<br />
dtx_232<br />
tx_422<br />
RX_422<br />
RS232<br />
i/f<br />
RS422<br />
i/f<br />
A<br />
B<br />
Dual<br />
Serial<br />
i/o<br />
chip<br />
scom_irq<br />
Kernel<br />
microprocessor<br />
tx_232<br />
RS232<br />
i/f<br />
SEL<br />
Figure 11 : Serial machine control<br />
The ES/2 KERNEL microprocessor has a dual serial interface chip (U44). One side of this chip is<br />
used for the diagnostics port while the other is used to control serial machines. The port is capable<br />
of communicating with either RS232 or RS422 standards depending on the SEL line on the serial<br />
machine connector port. This line selects which receive line is decoded by the serial chip. For<br />
RS232 the SEL line is tied to 0V and for RS422 the SEL line should be left open. Figure 11 shows a<br />
block diagram of the serial port.<br />
Sony serial.<br />
Sony 5000 series video machine, such as the quite popular 5850, require a serial stream to control<br />
shuttle mode. The machine outputs a clock signal with a sync waveform every 16 bits. The ES/2<br />
buffers the clock waveform with U22F and converts the sync square wave to a high going pulse<br />
every rising edge. The ES/2 outputs a high going edge during the bit number 13 to command the<br />
machine to enter shuttle mode. No other commands are used by the ES/2. Figure 12 shows a block<br />
diagram of the Sony serial interface.<br />
Sony<br />
clock<br />
Sony<br />
sync<br />
Pulse<br />
shaper<br />
16 bit<br />
shift<br />
register<br />
Kernel<br />
microprocessor<br />
Sony<br />
out<br />
fpga : SUPPORT<br />
Figure 12 : Sony serial interface.<br />
Issue 1 1:17
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