STPCI2 STMicroelectronics, STPCI2 Datasheet - Page 94

• Manufacturer Part Number: STPCI2
• Description: STPC ATLAS DATASHEET - X86 CORE PC COMPATIBLE SYS
• Manufacturer: STMicroelectronics

DESIGN GUIDELINES
memory clock input (MCLKI) and any other
component
individually driven from a low skew clock driver
with matched routing lengths. In other words, all
94/111
* No additional 75mm when SDRAM directly soldered on board
Low skew clock driver:
using
MCLKO
the
memory
Figure 6-22. DIMM placement
Figure 6-23. Clock Routing
clock
Issue 1.0 - July 24, 2002
are
SDRAM I/F
DIMM2
DIMM1
116mm
STPC
35mm
clock line lengths that go from the buffer to the
memory chips (MCLKx) and from the buffer to the
STPC (MCLKI) must be identical.
This is shown in
L+75mm*
L
15mm
35mm
Figure
20pF
DIMM CKn input
DIMM CKn input
DIMM CKn input
10mm
6-23.
STPC MCLKI