PATHDocumentation > Hardware > Original Power Mac G4 Developer Note


Digital Monitor Connector

The connector for the digital video monitor is a standard digital-only DVI connector. Figure 3-4 shows the contact configuration and Table 3-4 lists the signal assignments.

Figure 3-4  Digital monitor connector


Table 3-4  Signals on the digital monitor connector

Pin

Signal name

Pin

Signal name

1 TMDS Data2- 13 TMDS Data3+
2 TMDS Data2+ 14 +5V Power
3 TMDS Data2/4 Shield 15 Ground for +5V Power
4 TMDS Data4- 16 Hot Plug Detect
5 TMDS Data4+ 17 TMDS Data0-
6 DDC Clock 18 TMDS Data0+
7 DDC Data 19 TMDS Data0/5 Shield
8 n. c. 20 TMDS Data5-
9 TMDS Data1- 21 TMDS Data5+
10 TMDS Data1+ 22 TMDS Clock Shield
11 TMDS Data1/3 Shield 23 TMDS Clock+
12 TMDS Data3- 24 TMDS Clock-


The graphics data sent to the digital monitor use transition minimized differential signaling (TMDS). TMDS uses an encoding algorithm to convert bytes of graphics data into characters that are transition-minimized to reduce EMI with copper cables and DC-balanced for transmission over fiber optic cables. The TMDS algorithm also provides robust clock recovery for greater skew tolerance with longer cables or low cost short cables.

For information about TMDS, see the specification, Digital Visual Interface DVI Revision 1.0, available on the web site of the Digital Display Working Group (DDWG) at

http://www.ddwg.org/index.html


© 2000 Apple Computer, Inc. – (Last Updated 13 Jan 00)