Compatible Systems RISC 2800i Manual de usuario Pagina 51

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MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor 51
System Design Information
9.8.5.3 Minimum Core Frequency Requirements with DFS
In many systems, enabling DFS can result in very low processor core frequencies. However, care must be
taken to ensure that the resulting processor core frequency is within the limits specified in Table 8. Proper
operation of the device is not guaranteed at core frequencies below the specified minimum f
core
.
4x 2x
5x 2.5x
5.5x N/A
6x 3x
6.5x N/A
7x 3.5x
7.5x N/A
8x 4x
8.5x N/A
9x 4.5x
9.5x N/A
10x 5x
10.5x N/A
11x 5.5x
11.5x N/A
12x 6x
12.5x N/A
13x 6.5x
13.5x N/A
14x 7x
15x 7.5x
16x 8x
17x 8.5x
18x 9x
20x 10x
21x 10.5x
24x 12x
28x 14x
Table 16. Valid Divide Ratio Configurations (continued)
Bus-to-Core Multiplier Configured
by PLL_CFG[0:4]
(see Table 13)
Bus-to-Core Multiplier with
HID1[DFS1] = 1
(
÷2)
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