Topic V10
Clock and Frequency
1
, f one diagram for digital circuit
CPU Clocking
Example:
1 clock period = 250 ps (picoseconds)
clock period ≣ duration of clock cycle
1 clock period = 0.25 ns (nanoseconds)
1 clock period = 250 × 10-12 s (seconds)
regular andkeeps changing fullcycle
between o e i Clock period
Clock f do it
Data transfer
happensbetween
and computation
clockperiod
Update state
update Time
duringtransition
Example:
clock frequency ≣ clock rate 4.0 GHz (GigaHertz)
number of clock cycles per second 4000 MHz (MegaHertz)
sec
howmany cycles are happening in one 4.0 × 109 Hz
2 i
Clock and Frequency
1
, f one diagram for digital circuit
CPU Clocking
Example:
1 clock period = 250 ps (picoseconds)
clock period ≣ duration of clock cycle
1 clock period = 0.25 ns (nanoseconds)
1 clock period = 250 × 10-12 s (seconds)
regular andkeeps changing fullcycle
between o e i Clock period
Clock f do it
Data transfer
happensbetween
and computation
clockperiod
Update state
update Time
duringtransition
Example:
clock frequency ≣ clock rate 4.0 GHz (GigaHertz)
number of clock cycles per second 4000 MHz (MegaHertz)
sec
howmany cycles are happening in one 4.0 × 109 Hz
2 i
