ppc460ex Applied Micro Circuits Corporation (AMCC), ppc460ex Datasheet - Page 80

• Manufacturer Part Number: ppc460ex
• Description: Powerpc 460ex Embedded Processor
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

460EX – PPC460EX Embedded Processor
Table 17. Peripheral Interface Clock Timings (Part 2 of 2)
80
PerClk frequency
PerClk period
PerClk high time
PerClk low time
SPIClkOut frequency
IICSClk frequency
TmrClk frequency
TmrClk period
TmrClk high time
TmrClk low time
TrcClk frequency
UARTSerClk frequency
UARTSerClk period
UARTSerClk high time
UARTSerClk low time
USB2DClk frequency
USB2DClk period
USB2DClk high time
USB2DClk low time
USB2HClk frequency
USB2HClk period
USB2HClk high time
USB2HClk low time
USB2HClk48 frequency
USB2HClk48 period
USB2HClk48 high time
USB2HClk48 low time
Notes:
1. T
2. An internal PLL improves this duty cycle to a worst case of 48% minimum, 52% maximum.
3. Crystals, external clocks, or external oscillators must have a maximum tolerance of ±100ppm and maximum jitter of ±100ps.Only
frequency is 83 MHz.
frequencies of 12MHz, 24MHz, or 48MHz are allowed.
OPB
is the period in ns of the OPB clock. The internal OPB clock runs at 1/2 the frequency of the PLB clock. The maximum OPB clock
Parameter
50% of nominal period
33% of nominal period
40% of nominal period
40% of nominal period
40% of nominal period
40% of nominal period
40% of nominal period
40% of nominal period
40% of nominal period
40% of nominal period
2T
Minimum
T
T
OPB
OPB
OPB
16.66
16.66
20.8
33
10
10
??
60
60
12
–
–
1
1
1
+ 1
+ 1
+ 2
66% of nominal period
50% of nominal period
60% of nominal period
60% of nominal period
60% of nominal period
60% of nominal period
60% of nominal period
60% of nominal period
60% of nominal period
60% of nominal period
1000/(2T
Preliminary Data Sheet
Maximum
16.66
16.66
83.33
100
440
100
OPB
30
??
60
60
48
Revision 1.12 – July 17, 2008
–
–
–
–
1
+ 2ns)
Units
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
AMCC Proprietary
Notes
1
1
1
1
3
3
3