+/+…when timing is critical
C9810
Low EMI Clock Generator for Intel 810 Chipset for Mobile Applications
Advanced Information
IMI Confidential
Clock Synchronization and Phase Alignment
This device incorporates IOAPIC clock synchronization. With this feature, the IOAPIC clocks are derived from the CPU
clock. The IOAPIC clock lags the CPU clock by the specified 1.5 to 3.5 nSec. Figure 3 shows the relationship between
the CPU and IOAPIC clocks.
Device Clock Phase Relationships
0nS
10nS
20nS
30nS
40nS
CPU CLOCK
CPU CLOCK
CPU CLOCK
66MHz
2.5nS
100MHz
133MHz
5nS
Sync
7.5nS
5nS
SDRAM CLOCK
SDRAM CLOCK
100MHz
133MHz
3V66 CLOCK
PCI CLOCK
66MHz
1.5~3.5nS
33MHz
IOAPIC CLOCK
33MHz
Fig.3
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035, USA TEL: 408-263-6300, FAX 408-263-6571
Rev 0.4
8/31/1999
Page 4 of 15
http://www.imicorp.com
CYPRESS [ CYPRESS ]
