参数资料
型号: MPC8315E-RDBA
厂商: Freescale Semiconductor
文件页数: 99/106页
文件大小: 0K
描述: BOARD MPU 8315 POWERQUICC II
标准包装: 1
系列: PowerQUICC II™ PRO
类型: MPU
适用于相关产品: MPC8315E
所含物品:
MPC8315E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2
92
Freescale Semiconductor
Clocking
This table provides the operating frequencies for the TEPBGA II under recommended operating
conditions (see Table 2).
24.1
System PLL Configuration
The system PLL is controlled by the RCWL[SPMF] parameter. Table 73 shows the multiplication factor
encodings for the system PLL.
NOTE
If RCWL[DDRCM] and RCWL[LBCM] are both cleared, the system PLL
VCO frequency = (CSB frequency)
(System PLL VCO Divider).
If either RCWL[DDRCM] or RCWL[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 450–750 MHz.
Table 71. Configurable Clock Units
Unit
Default Frequency
Options
eTSEC1
csb_clk
Off, csb_clk, csb_clk/2, csb_clk/3
eTSEC2
csb_clk
Off, csb_clk, csb_clk/2, csb_clk/3
Security Core, I2C, SAP, TPR
csb_clk
Off, csb_clk, csb_clk/2, csb_clk/3
USB DR
csb_clk
Off, csb_clk, csb_clk/2, csb_clk/3
PCI and DMA complex
csb_clk
Off, csb_clk
PCI Express
csb_clk
Off, csb_clk
Serial ATA
csb_clk
Off, csb_clk, csb_clk/2, csb_clk/3
Table 72. Operating Frequencies for TEPBGA II
Characteristic1
Max Operating Frequency
Unit
e300 core frequency (core_clk)
400
MHz
Coherent system bus frequency (csb_clk)
133
MHz
DDR1/2 memory bus frequency (MCK)2
133
MHz
Local bus frequency (LCLKn)3
66
MHz
PCI input frequency (SYS_CLK_IN or PCI_CLK)
24-66
MHz
Note:
1. The SYS_CLK_IN frequency, RCWL[SPMF], and RCWL[COREPLL] settings must be chosen such that the resulting csb_clk,
MCK, LCLK[0:1], and core_clk frequencies do not exceed their respective maximum or minimum operating frequencies.
2. The DDR data rate is 2x the DDR memory bus frequency.
3. The local bus frequency is 1/2, 1/4, or 1/8 of the lbiu_clk frequency (depending on LCRR[CLKDIV]) which is in turn 1x or 2x the
csb_clk frequency (depending on RCWL[LBCM]).
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