- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98149 > STPCC0390BTC3 (STMICROELECTRONICS) MULTIFUNCTION PERIPHERAL, PBGA388 PDF資料下載
參數(shù)資料
| 型號： | STPCC0390BTC3 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | MULTIFUNCTION PERIPHERAL, PBGA388 |
| 封裝： | PLASTIC, BGA-388 |
| 文件頁數(shù)： | 42/59頁 |
| 文件大小： | 932K |
| 代理商： | STPCC0390BTC3 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁當前第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁
BOARD LAYOUT
Issue 1.1 - October 16, 2000
47/59
6.3 Memory interface
6.3.1 Introduction
In order to achieve SDRAM memory interfaces
which work at clock frequencies of 100MHz and
above, careful consideration has to be given to the
timing of the interface with all the various electrical
and physical constraints taken into consideration.
The guidelines described below are related to
SDRAM components on DIMM modules. For ap-
plications where the memories are directly sol-
dered to the motherboard, the PCB should be laid
out such that the trace lengths fit within the con-
straints shown here. The traces could be slightly
longer since the extra routing on the DIMM PCB is
no longer present but it is then up to the user to
verify the timings.
6.3.2 SDRAM Clocking Scheme
The SDRAM Clocking Scheme deserves a special
mention here. Basically the memory clock is gen-
erated on-chip through a PLL and goes directly to
the MCLKO output pin of the STPC. The nominal
frequency is 100MHz. Because of the high load
presented to the MCLK on the board by the
DIMMs it is recommeded to rebuffer the MCLKO
signal on the board and balance the skew to the
clock ports of the different DIMMs and the MCLKI
input pin of STPC.
6.3.3 Board Layout Issues
The physical layout of the motherboard PCB as-
sumed in this presentation is as shown inFigure
6-10. Because all 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 the 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
Figure 6-9. Clock scheme
D
IMM1
MCLKI
MCLKO
D
IMM2
PLL
regi
s
ter
PLL
MA[] + Control
MD[]
SDRAM
CONTROLLER
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| STPCD0110BTC3 | 32-BIT, 100 MHz, MICROPROCESSOR, PBGA388 |
| STPCD0112BTC3 | 32-BIT, 120 MHz, MICROPROCESSOR, PBGA388 |
| STPCI2EEYC | MULTIFUNCTION PERIPHERAL, PBGA516 |
| STPCI2HDYI | MULTIFUNCTION PERIPHERAL, PBGA516 |
| STPCI2HEYI | MULTIFUNCTION PERIPHERAL, PBGA516 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STPCC4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:STPC CONSUMER-II DATASHEET / X86 CORE PC COMPATIBLE INFORMATION APPLIANCE SYSTEM-ON-CHIP |
| STPCC4EEBC | 制造商:STMicroelectronics 功能描述:CONS-II 100MHZ COM - Trays 制造商:STMicroelectronics 功能描述:MULTIFUNCTION PERIPHERAL, PBGA388 |
| STPCC4HEBC | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:X86 Core PC Compatible Information Appliance System-on-Chip |
| STPCC4HEBI | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:X86 Core PC Compatible Information Appliance System-on-Chip |
| STPCC5HEBC | 功能描述:微處理器 - MPU 133MHz x86 Embedded RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:536 MHz 程序存儲器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-324 |
發(fā)布緊急采購，3分鐘左右您將得到回復。