Orion and Maia ADD2 User Guide
5
SiI-
UG-0044-A
Note that the 2.5V I
2
C interface to the Grantsdale G chipset operates at speeds up to 1MHz when communicating
with the on-chip registers.
Hot Plug and Receiver Sense
Either Hot Plug or Receiver Sense can indicate attachment of a Digital Display to the ADD2 Card.
Hot Plug detects whether a display is attached by sensing when the display returns a 2V to 5V level on
the DVI connector Hot Plug pin.
Receiver Sense detects whether an attached display has applied power to its TMDS receiver by sensing
the voltage on the TMDS lines.
With this technology, no external circuit is required. While the ADD2 card supports both functions, only one can be
enabled at a time. At power-up time the Receiver Sense circuit is enabled, but the motherboard drivers typically
program the chip so that the Hot Plug function is used instead.
Physical Dimensions and Devices
Figure 4 illustrates the physical dimensions of the ADD2-N and ADD2-R cards. The PCI Express Card
Electromechanical Specification requires the maximum height of a low profile card to be 2.731inches(69.37mm)
or lower. The Orion ADD2-N and Maia ADD2-R cards are designed to meet this specification at a height of
2.57inch (65.4mm).
Figure 4. Physical Dimension and Device list
