参数资料
型号: MPC8378EVRANG
厂商: Freescale Semiconductor
文件页数: 14/127页
文件大小: 0K
描述: MPU PWRQUICC II 800MHZ 689TEPBGA
标准包装: 27
系列: MPC83xx
处理器类型: 32-位 MPC83xx PowerQUICC II Pro
速度: 800MHz
电压: 1.05V
安装类型: 表面贴装
封装/外壳: 689-BBGA 裸露焊盘
供应商设备封装: 689-TEPBGA II(31x31)
包装: 托盘
配用: MPC8377E-RDBA-ND - BOARD REF DES MPC8377 REV 2.1
MPC8377E-MDS-PB-ND - BOARD MODULAR DEV SYSTEM
MPC8377E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
110
Freescale Semiconductor
23.1
System PLL Configuration
The system PLL is controlled by the RCWLR[SPMF] parameter. The system PLL VCO frequency
depends on RCWLR[DDRCM] and RCWLR[LBCM]. Table 75 shows the multiplication factor encodings
for the system PLL.
NOTE
If RCWLR[DDRCM] and RCWLR[LBCM] are both cleared, the system
PLL VCO frequency = (CSB frequency)
× (System PLL VCO Divider).
If either RCWLR[DDRCM] or RCWLR[LBCM] are set, the system PLL
VCO frequency = 2
× (CSB frequency) × (System PLL VCO Divider).
The VCO divider needs to be set properly so that the System PLL VCO
frequency is in the range of 400–800 MHz.
As described in Section 23, “Clocking,The LBIUCM, DDRCM, and SPMF parameters in the reset
configuration word low and the CFG_CLKIN_DIV configuration input signal select the ratio between the
primary clock input (CLKIN or PCI_CLK) and the internal coherent system bus clock (csb_clk). Table 77
and Table 78 show the expected frequency values for the CSB frequency for select csb_clk to
CLKIN/PCI_SYNC_IN ratios.
The RCWLR[SVCOD] denotes the system PLL VCO internal frequency as shown in Table 76.
Table 75. System PLL Multiplication Factors
RCWLR[SPMF]
System PLL Multiplication Factor
0000
Reserved
0001
Reserved
0010
× 2
0011
× 3
0100
× 4
0101
× 5
0110
× 6
0111–1111
× 7 to × 15
Table 76. System PLL VCO Divider
RCWLR[SVCOD]
VCO Division Factor
00
4
01
8
10
2
11
1
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