Revision 1.19 – May 07, 2008
440GR – PPC440GR Embedded Processor
Preliminary Data Sheet
Table 18. Clocking Specifications
Symbol
CPU Clock
FC
Parameter
Min
Max
Units
333
667
Frequency
SysClk Input
FC
Frequency
Period
33.33
66.66
30
MHz
ns
TC
15
TCS
TCH
TCL
Edge stability (cycle-to-cycle jitter)
–
±0.15
ns
High time
Low time
40% of nominal period
40% of nominal period
60% of nominal period
60% of nominal period
ns
ns
Note: Input slew rate ≥ 1V/ns
MemClkOut and PLB Clock
FC
TC
Frequency
Period
100
7.5
133.33
10
MHz
ns
TCH
High time
45% of nominal period
55% of nominal period
ns
PLL VCO
FC
Frequency
Period
600
1334
1.66
MHz
ns
TC
TrcClk
FC
0.7496
CPU FC/4
CPU FC/4
Frequency
MAL Clock
FC
Frequency
Period
45
12
83.33
22.2
MHz
ns
TC
Figure 5. Timing Waveform
1.7V (1.8V)
1.25V (1.5V)
0.7V (0.8V)
T
T
CL
CH
T
C
Note: SysClk is 2.5V/3.3V tolerant receiver. Slew rate should be measured between 0.7V and 1.7V.
68
AMCC Proprietary