mpc8536e Freescale Semiconductor, Inc, mpc8536e Datasheet - Page 108

• Manufacturer Part Number: mpc8536e
• Description: Mpc8536e Powerquicctm Iii Integrated Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Clocking
2.23.2
The CCB clock is the clock that drives the e500 core complex bus (CCB), and is also called the platform clock. The frequency
of the CCB is set using the following reset signals, as shown in
Note that there is no default for this PLL ratio; these signals must be pulled to the desired values.
2.23.3
Table 76
by the binary value of LBCTL, LALE and LGPL2 at power up, as shown in
2.23.4
The DDR memory controller complex can be synchronous with, or asynchronous to, the CCB, depending on configuration.
Table 77
DDRCLK, which is not the memory bus clock.
When synchronous mode is selected, the memory buses are clocked at half the CCB clock rate. The default mode of operation
is for the DDR data rate for the DDR controller to be equal to the CCB clock rate in synchronous mode, or the resulting DDR
PLL rate in asynchronous mode.
In asynchronous mode, the DDR PLL rate to DDRCLK ratios listed in
since the DDR PLL rate in asynchronous mode means the DDR data rate resulting from DDR PLL output.
108
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SYSCLK input signal
Binary value on LA[28:31] at power up
describes the clock ratio between the e500 core complex bus (CCB) and the e500 core clock. This ratio is determined
describes the clock ratio between the DDR memory controller complex and the DDR/DDRCLK PLL reference clock,
Binary Value of
LGPL2 Signals
LBCTL, LALE,
CCB/SYSCLK PLL Ratio
e500 Core PLL Ratio
DDR/DDRCLK PLL Ratio
000
001
010
011
LA[28:31] Signals
MPC8536E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 2
Binary Value of
0000
0001
0010
0011
0100
0101
0110
0111
e500 core: CCB Clock Ratio
Table 76. e500 Core to CCB Clock Ratio
CCB:SYSCLK Ratio
Reserved
4:1
9:2
3:2
Reserved
Reserved
Reserved
Table 75. CCB Clock Ratio
16:1
3:1
4:1
5:1
6:1
Table
LA[28:31] Signals
Binary Value of
LGPL2 Signals
Binary Value of
LBCTL, LALE,
75:
1000
1001
1010
1011
1100
1101
1110
1111
Table 77
100
101
110
111
Table
reflects the DDR data rate to DDRCLK ratio,
76.
e500 core: CCB Clock Ratio
CCB:SYSCLK Ratio
Reserved
Reserved
Reserved
Reserved
10:1
12:1
8:1
9:1
2:1
5:2
3:1
7:2
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