參數(shù)資料
型號(hào): STPCI2HEYI
廠商: STMICROELECTRONICS
元件分類: 外設(shè)及接口
英文描述: MULTIFUNCTION PERIPHERAL, PBGA516
封裝: PLASTIC, BGA-516
文件頁(yè)數(shù): 105/109頁(yè)
文件大?。?/td> 2430K
代理商: STPCI2HEYI
STPC ATLAS
Issue 1.1 - March 23, 2004
95/109
6.5.0.1. Clock topology for standard DIMM
Figure 6-26 and Figure 6-27 give the recommend-
ed clock topology and the resulting IBIS simulation
in the case of a standard DIMM with the use of a
clock buffer.
Figure 6-25. IBIS Simulation for on-board SDRAM / 90MHz
0.8 V
2.0 V
833ps
791ps
3
2
1
MCLKI
MCLKO
(V)
MCLKx
Time
Figure 6-26. Recommended topology for DIMM (IBIS model)
MCLKI
22 Ohms
3000 mils
Track impedance= 75 Ohms
Trace thickness = 0.72 mil
Trace width = 4 to 8 mils
Buffer out
18 Ohms
2000 mils
DIMM
Buffer out
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