On 04.09.2022 14:17, Louis Ohland wrote:
https://www.ardent-tool.com/complex/T4_Y.html#Q_vs_Y
Additionally, a 10-bit bus switch (U76) and a discrete diode (CR4) were
added to create a level-shifter for the few non-C5C'/C8C' CPU inputs
signals. This was necessary because the I/O is no longer 5 V-tolerant on
the P54C CPUs.
Is that a Hurst shifter? Zero to sixty in how many seconds?
Drifting video to come?
0-60 in a few hundred picoseconds! Yea, the 3384 is pretty fast. But its drift/skew capabilities are minimal. Which is good thing in this case. ;)
It surprised me that there were only 10 external CPU input signals
(ignoring the 5 V clock). The rest is covered by the C5/C8 set as it
sits between the CPU and the rest of the system (BIU and SynchroStream).
C5/C8 inputs are 5 V-tolerant and don't need level shifting. And neither
do any of the CPU/C5/C8 *outputs* of course.
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