Micro­power

  

Volume 1, Number 1 – August 1981

Page 24 of 33

WAVEFORM DIAGRAMS




2 MHZ VERSION:




4 MHZ VERSION:





NOTES

1,2,3,4 –Different starts of Z-80 access cycle with respect to 1 MHz
 
–This point in time that the ‘WAIT’ signal is sampled by the Z-80
 
* –Effect of adding capacitor to extend write access – not normally needed
 
–This ensures that ‘WAITS’ generated from different sources do not disturb this synchronisation logic.
 
# –This ‘preliminary pulse on RVSEL has no effect since cycle is not complete, it is during an unused processor access ‘slot’, and there is no corresponding write gate WVSEL

Page 24 of 33