Revision 1.26 – October 15, 2007
440EPx – PPC440EPx Embedded Processor
Preliminary Data Sheet
Table 19. Peripheral Interface Clock Timings (Sheet 2 of 3)
Parameter
Min
Max
Units
Notes
PerClk (and OPB Clock) frequency (for ext. master or sync.
slaves)
33.33MHz
83.33
MHz
PerClk period
PerClk high time
PerClk low time
12
30
ns
ns
ns
50% of nominal period
33% of nominal period
66% of nominal period
50% of nominal period
1000 / (2TOPB1+2ns)
UARTSerClk frequency
UARTSerClk period
–
MHz
ns
1
1
1
1
2TOPB1+2
TOPB1+1
TOPB1+1
–
–
–
UARTSerClk high time
UARTSerClk low time
ns
ns
USB2Clk frequency
60
60
MHz
ns
3
3
3
3
USB2Clk period
16.66
12
16.66
48
USB2XtalIn/USB2XtalOut frequency
USB2XtalIn/USB2XtalOut period
USB2XtalIn/USB2XtalOut high time
USB2XtalIn/USB2XtalOut low time
MHz
ns
20.8
83.33
40% of nominal period
40% of nominal period
60% of nominal period
60% of nominal period
ns
ns
AMCC Proprietary
77
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
