参数资料
型号: MPC8536ECVTATHA
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 1250 MHz, MICROPROCESSOR, PBGA783
封装: 29 X 29 MM, 2.80 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, FCBGA-783
文件页数: 11/127页
文件大小: 1893K
代理商: MPC8536ECVTATHA
MPC8536E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 3
Clocking
Freescale Semiconductor
108
2.23.2
CCB/SYSCLK PLL Ratio
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 Table 75:
SYSCLK input signal
Binary value on LA[28:31] at power up
Note that there is no default for this PLL ratio; these signals must be pulled to the desired values.
2.23.3
e500 Core PLL Ratio
Table 76 describes the clock ratio between the e500 core complex bus (CCB) and the e500 core clock. This ratio is determined
by the binary value of LBCTL, LALE and LGPL2 at power up, as shown in Table 76.
2.23.4
DDR/DDRCLK PLL Ratio
The DDR memory controller complex can be synchronous with, or asynchronous to, the CCB, depending on configuration.
Table 77 describes the clock ratio between the DDR memory controller complex and the DDR/DDRCLK PLL reference clock,
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 Table 77 reflects the DDR data rate to DDRCLK ratio,
since the DDR PLL rate in asynchronous mode means the DDR data rate resulting from DDR PLL output.
Table 75. CCB Clock Ratio
Binary Value of
LA[28:31] Signals
CCB:SYSCLK Ratio
Binary Value of
LA[28:31] Signals
CCB:SYSCLK Ratio
0000
16:1
1000
8:1
0001
Reserved
1001
9:1
0010
Reserved
1010
10:1
0011
3:1
1011
Reserved
0100
4:1
1100
12:1
0101
5:1
1101
Reserved
0110
6:1
1110
Reserved
0111
Reserved
1111
Reserved
Table 76. e500 Core to CCB Clock Ratio
Binary Value of
LBCTL, LALE,
LGPL2 Signals
e500 core: CCB Clock Ratio
Binary Value of
LBCTL, LALE,
LGPL2 Signals
e500 core: CCB Clock Ratio
000
4:1
100
2:1
001
9:2
101
5:2
010
Reserved
110
3:1
011
3:2
111
7:2
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