MPC8245ARZU466D FREESCALE [Freescale Semiconductor, Inc], MPC8245ARZU466D Datasheet - Page 5

• Manufacturer Part Number: MPC8245ARZU466D
• Description: Part Number Specification for the MPC8245ARZUnnnX Series
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

4.3.1 Clock AC Specifications
Figure 7
(400 and 466 MHz). These graphs define the areas of DLL locking for various modes. The gray areas show where
the DLL will lock.
Register settings that define each DLL mode are shown in
The DLL_MAX_DELAY bit can lengthen the amount of time through the delay line. This is accomplished by
increasing the time between each of the 128 tap points in the delay line. Although this increased time makes it easier
to guarantee that the reference clock will be within the DLL lock range, it also means there may be slightly more
jitter in the output clock of the DLL, should the phase comparator shift the clock between adjacent tap points. Refer
to Freescale application note AN2164, MPC8245/MPC8241 Memory Clock Design Guidelines, for details on
memory design.
Freescale Semiconductor
through
Figure 10
Normal tap delay,
No DLL extend
Normal tap delay,
DLL extend
Max tap delay,
No DLL extend
Max tap delay,
DLL extend
MPC8245 Part Number Specification for the MPC8245ARZUnnnX Series, Rev. 2
DLL Mode
show the DLL locking range loop delay vs. frequency of operation for 29 angstrom parts
Table 9. DLL Mode Definition
Value of Bit 2 of Config
Register at 0x76
0
0
1
1
Table
9.
Value of Bit 7 of Config
Register at 0x72
0
1
0
1
General Parameters
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