Product Overview Intel® Server Board SE7520BD2 Technical Product Specification
30 Revision 1.3
• One 100-MHz reference clock to the DB800 (for generating 100-MHz Serial Reference
Clocks).
2.11.2 DB800 Differential Buffer
The DB800 differential buffer provides 100-MHz reference clocks for the PCI-Express
devices/slots and Serial ATA components. The DB800 accepts a single differential clock input
from the CK409 clock synthesizer and produces eight buffered differential outputs.
On the Server Board SE7520BD2, the SRC is connected to the ICH5-R, MCH, PXH, two PCI-
Express slots and the Marvell* “Yukon” 88E8050 LAN.