- Offizieller Beitrag
16) PHI1# driver
PHI1# driver is located a bit East from the A4 pad in the silicon.
It's an inverting super buffer, fed by PHI1, sending PHI1# through two metal traces
into "17) control signal latches\drivers".
IIRC the NMOS 6502 uses two smaller inverting super buffers instead,
each of them driving a PHI1# metal trace separately.
That part of the 6509 CPU core definitely is different from the NMOS 6502.
Bitte melde dich an, um diesen Anhang zu sehen.
Bitte melde dich an, um diesen Anhang zu sehen.
;---
It's the first time I have seen a pulldown FET used inside a super buffer,
and I wonder why the designers did it that way.
Bitte melde dich an, um diesen Anhang zu sehen.