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參數(shù)資料
| 型號： | MSC7116VF1000 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | Low-Cost 16-bit DSP with DDR Controller and 10/100 Mbps Ethernet MAC |
| 中文描述： | 低成本16位數(shù)字信號處理器與DDR控制器和10/100 Mbps以太網(wǎng)MAC |
| 文件頁數(shù)： | 22/56頁 |
| 文件大?。?/td> | 719K |
| 代理商： | MSC7116VF1000 |
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MSC7116 10/100 Mbps Ethernet MAC Data Sheet, Rev. 11
Electrical Characteristics
Freescale Semiconductor
22
2.5.2
Configuring Clock Frequencies
This section describes important requirements for configuring clock frequencies in the MSC7116 device when using the PLL
block. To configure the device clocking, you must program four fields in the Clock Control Register (CLKCTL):
PLLDVF field
. Specifies the PLL division factor (PLLDVF + 1) to divide the input clock frequency
F
CLKIN
. The output
of the divider block is the input to the multiplier block.
PLLMLTF field
. Specifies the PLL multiplication factor (PLLMLTF + 1). The output from the multiplier block is the
loop frequency F
LOOP
.
RNG field
. Selects the available PLL frequency range for F
VCO
, either F
LOOP
when the RNG bit is set (1) or F
LOOP
/2
when the RNG bit is cleared (0).
CKSEL field
. Selects F
CLKIN
, F
VCO
, or F
VCO
/2 as the source for the core clock.
There are restrictions on the frequency range permitted at the beginning of the multiplication portion of the PLL that affect the
allowable values for the PLLDVF and PLLMLTF fields. The following sections define these restrictions and provide guidelines
to configure the device clocking when using the PLL. Refer to the Clock and Power Management chapter in the
MSC711x
Reference Manual
for details on the clock programming model.
2.5.2.1
PLL Multiplier Restrictions
There are two restrictions for correct usage of the PLL block:
The input frequency to the PLL multiplier block (that is, the output of the divider) must be in the range 10–25 MHz.
The output frequency of the PLL multiplier must be in the range 266–532 MHz.
When programming the PLL for a desired output frequency using the PLLDVF, PLLMLTF, and RNG fields, you must meet
these constraints.
2.5.2.2
Input Division Factors and Corresponding CLKIN Frequency Range
The value of the PLLDVF field determines the allowable
CLKIN
frequency range, as shown in
Table 9
.
Table 9. CLKIN Frequency Ranges by Divide Factor Value
PLLDVF
Field Value
Input Divide
Factor
CLKIN Frequency Range
Comments
0x00
1
10 to 25 MHz
Input Division by 1
0x01
2
20 to 50 MHz
Input Division by 2
0x02
3
30 to 75 MHz
Input Division by 3
0x03
4
40 to 100 MHz
Input Division by 4
0x04
5
50 to 100 MHz
Input Division by 5
0x05
6
60 to 100 MHz
Input Division by 6
0x06
7
70 to 100 MHz
Input Division by 7
0x07
8
80 to 100 MHz
Input Division by 8
0x08
9
90 to 100 MHz
Input Division by 9
0x09
10
100 MHz
Input Division by 10
Note:
The maximum CLKIN frequency is 100 MHz. Therefore, the PLLDVF value must be in the range from 1–10.
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| MSC7118 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Low-Cost 16-bit DSP with DDR Controller |
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