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| 型号： | STPCI2EEYC |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 外设及接口 |
| 英文描述： | MULTIFUNCTION PERIPHERAL, PBGA516 |
| 封装： | PLASTIC, BGA-516 |
| 文件页数： | 59/80页 |
| 文件大小： | 854K |
| 代理商： | STPCI2EEYC |
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BOARD LAYOUT
Issue 0.4 - July 16, 2001
62/80
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
5.3.3 Board Layout Issues
The physical layout of the motherboard PCB as-
sumed in this presentation is as shown inFigure
5-11. Because all of the memory interface signal
balls are located in the same region of the STPC
device, it is possible to orientate the device to re-
duce the trace lengths. The worst case routing
length to the DIMM1 is estimated to be 100mm.
Solid power and ground planes are a must in order
to provide good return paths for the signals and to
reduce EMI and noise. Also there should be ample
high frequency decoupling between the power
and ground planes to provide a low impedance
path between the planes for the return paths for
signal routings which change layers. If possible,
the traces should be routed adjacent to the same
power or ground plane for the length of the trace.
For the SDRAM interface, the most critical signal
is the clock. Any skew between the clocks at the
SDRAM components and the memory controller
will impact the timing budget. In order to get well
matched clocks at all components it is recom-
mended that all the DIMM clock pins, STPC mem-
ory clock input (MCLKI) and any other component
using the memory clock are individually driven
from a low skew clock driver with matched routing
lengths. This is shown in Figure 5-12.
Figure 5-11. DIMM placement
D IMM2
D IMM1
ST P C
35m m
15 m m
10 m m
116m m
S DRA M I/F
Figure 5-12. Clock Routing
MCL K O
D IM M C K n input
ST P C M C LK I
D IM M C K n input
Low s ke w c lo c k driv er:
L
L+ 75m m *
2 0pF
* N o additional 75m m w hen S DRA M direc tly s old er ed o n b oar d
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相关代理商/技术参数 |
参数描述 |
|---|---|
| STPCI2GDY | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:X86 Core PC Compatible System-on-Chip for Terminals |
| STPCI2GDYI | 功能描述:微处理器 - MPU 120MHz x86 SoC RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| STPCI2GDYIE | 制造商:STMicroelectronics 功能描述: |
| STPCI2HDYC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:PERIPHERAL (MULTIFUNCTION) CONTROLLER |
| STPCI2HEYC | 功能描述:微处理器 - MPU 133MHz x86 SoC RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
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