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 />
FIFO<br />
empty<br />
FIFO read<br />
Background<br />
FIFO write<br />
Background<br />
FIFO<br />
not<br />
empty<br />
end<br />
Message<br />
to be<br />
sent<br />
All<br />
characters<br />
sent<br />
Construct<br />
message<br />
All<br />
chars<br />
received<br />
Interpret<br />
message<br />
Write<br />
characters<br />
to FIFO<br />
FIFO<br />
empty<br />
Figure 6 : FIFO software diagram.<br />
FIFO<br />
full<br />
FIRQ generator<br />
The FIRQ line on a 6809 microprocessor is the second of three interrupt lines, NMI and IRQ being<br />
the other two. It is used in the ES/2 for scheduling various software routines including :<br />
<br />
<br />
<br />
<br />
Polling the keys.<br />
Tach timeout.<br />
Diagnostic port processing.<br />
Checking video periods.<br />
FPGA SPLIT (U38) contains the firq generator. It simply counts the main system ‘Q pulse’ and<br />
generates a low going pulse on the FIRQ line after 5ms. The firq subroutine then cancels the low<br />
level by writing to a location which clears the output latch.<br />
Issue 1 1:11
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