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參數(shù)資料
| 型號(hào)： | STPC12HEYC |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | X86 Core PC Compatible System-on-Chip for Terminals |
| 中文描述： | x86內(nèi)核PC兼容系統(tǒng)上的終端芯片 |
| 文件頁數(shù)： | 99/111頁 |
| 文件大?。?/td> | 1896K |
| 代理商： | STPC12HEYC |
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DESIGN GUIDELINES
Issue 1.0 - July 24, 2002
99/111
6.4.4.3. Board Layout Issues
The physical layout of the motherboard PCB
assumed in this presentation is as shown in
Figure
6-29
. For the PCI interface, the most critical signal
is the clock. Any skew between the clocks at the
PCI components and the STPC will impact the
timing budget. In order to get well matched clocks
at all components it is recommended that all the
PCI clocks are individually driven from a serial
resistance with matched routing lengths. In other
words, all clock line lengths that go from the
resistor to the PCI chips (PCICLKx) must be
identical.
The figure below is for PCI devices soldered on-
board. In the case of a PCI slot, the wire length
must be shortened by 2.5" to compensate the
clock layout on the PCI board. The maximum
clock skew between all devices is 2ns according
to PCI specifications.
The
Figure 6-30
describes a typical clock delay
implementation. The exact timing constraints are
listed in the PCI section of the
Electrical
Specifications
Chapter.
Figure 6-29. Typical PCI clock routing
Length(PCICLKI) = Length(PCICLKx) with x = {A,B,C}
Note: The value of 22 Ohms corresponds to tracks with Z
0
= 70 Ohms.
PCICLKI
PCICLKO
PCICLKA
PCICLKB
PCICLKC
Device A
Device B
Device C
Figure 6-30. Clocks relationships
PCICLKO
PCICLKI
HCLK
PCICLKx
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| STPCATLAS | X86 Core PC Compatible System-on-Chip for Terminals |
| STPC12HDYC | X86 Core PC Compatible System-on-Chip for Terminals |
| STPC12HDYI | X86 Core PC Compatible System-on-Chip for Terminals |
| STPCD0166BTA3 | PC Compatible Embedded Microprocessor |
| STPCD0166BTC3 | PC Compatible Embedded Microprocessor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STPC12HEYI | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:X86 Core PC Compatible System-on-Chip for Terminals |
| STPC1MBBL | 制造商:Panduit Corp 功能描述: |
| STPC1MBGR | 制造商:Panduit Corp 功能描述:Cable Assembly STP 1m 26AWG Modular Plug to Modular Plug PL-PL |
| STPC3MBBL | 制造商:Panduit Corp 功能描述: |
| STPC3MBGR | 制造商:Panduit Corp 功能描述:Cable Assembly STP 3m 26AWG Modular Plug to Modular Plug PL-PL |
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