參數(shù)資料
型號(hào): ICS9FG1904B-1
英文描述: Frequency Generator for CPU, PCIe Gen 1, PCIe Gen 2 & FBD
中文描述: 頻率發(fā)生器的CPU,1個(gè)PCIe代,第二代的PCIe
文件頁數(shù): 12/22頁
文件大小: 235K
代理商: ICS9FG1904B-1
12
Integrated
Circuit
Systems, Inc.
ICS9FG1904B-1
1255B—08/03/07
Using M/N Programming to Obtain Other Gear Ratios
M/N programming can be used to obtain input output frequency combinations that are not preconfigured in the
9FG1904B-1. Refer to Figure 2 PLL Block Diagram.
The internal architecture of the 9FG1904B-1 is standard pseudo-ZDB architecture with internal feedback. This means
that the REF divider, the Output divider and the Feedback divider all play a role in determining the output frequency.
The output frequency is given by the equation:
Output Frequency = (Input Frequency x N x Output Div)/M
The DBxxxxGSO input/output combinations that are not in the 9FG1904B-1 gear table are shown in Table 1 DBxxxxGSO
Gears Not Present n the 9FG1904B-1 This table also gives the values needed to program the gearing PLL to provide
the desired input/output combination.
Input
Clock
REF (M)
DIV
FBK (N)
DIV
vco
OUTPUT
DIV
BUFFERS
Output
Clocks
Figure 2 PLL Block Diagram
Setting the 1:1 PLL Operating Point
After configuring the Gearing outputs, it is also necessary to set the 1:1 PLL operating point by writing the input
frequency value to Byte 9 bits (2:0). The input frequency is usually the CPU HCLK frequency.
Note before the M/N programming can be accomplished, Byte 10, bit 7 (the M/N_Enable bit) must be set to a ‘1’. The
values provided in the table above have been verified to meet the specified performance of the 9FG1901B-1.
Performance is not guaranteed for any other values that have not been pre-approved by IDT. Contact your local IDT
representative for other values not mentioned here.
1:1 PLL Bytes
Byte
17
Byte
11
Byte
18
Byte
12
Byte
19
Byte
13
Gear PLL Bytes
D
Line
F
I
F
(
O
F
D
V
D
V
D
G
R
(
V
(
O
(
1
2
3
0 133.33 400.00
1 400.00 200.00
1 400.00 266.67
Table 1 DBxxxxGSO Gears Not Present in the 9FG1904B-1
4
12
12
12
6
8
2
4
3
3.000
0.500
0.667
2
A
A
A
4
6
0
4
1
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