參數(shù)資料
型號(hào): STPCI2HEYI
廠商: STMICROELECTRONICS
元件分類(lèi): 外設(shè)及接口
英文描述: MULTIFUNCTION PERIPHERAL, PBGA516
封裝: PLASTIC, BGA-516
文件頁(yè)數(shù): 103/109頁(yè)
文件大?。?/td> 2430K
代理商: STPCI2HEYI
STPC ATLAS
Issue 1.1 - March 23, 2004
93/109
memory clock input (MCLKI) and any other
component
using
the
memory
clock
are
individually driven from a low skew clock driver
with matched routing lengths specified in Section
4.5.3. . In other words, all clock line lengths that go
from the buffer to the memory chips (MCLKx) and
from the buffer to the STPC (MCLKI) must follow
this equation;
MCLKx = MCLKI+(1ns+/-0.5ns).
This is shown in Figure 6-23.
Figure 6-22. DIMM placement
DIMM2
DIMM1
STPC
35mm
15mm
10mm
116mm
SDRAM I/F
Figure 6-23. Clock Routing
MCLKO
DIMM CKn input
STPC MCLKI
DIMM CKn input
Low skew clock driver:
L+(1ns+/- 0.5ns)
L+75mm*
20pF
* No additional 75mm when SDRAM directly soldered on board
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STPCINDUSTRIAL 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:PC Compatible Embedded Microprocessor
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