
45732 AMD 780E Databook 3.10
© 2009 Advanced Micro Devices, Inc.
2-6
Proprietary
LVTM (LVDS/TMDS) Interface
2.3
LVTM (LVDS/TMDS) Interface
The RS780E’s LVTM (LVDS/TMDS) interface supports either an LVDS or a TMDS output. A custom video BIOS from
AMD will configure the LVTM interface to drive out either LVDS or a TMDS signals as desired.
A custom video BIOS and proper signal routing from the LVTM interface to a connector are the only requirements for the
RS780E to support either an LVDS or a TMDS output on the LVTM interface. No other register programming is needed
for selecting one option over the other, and customers should not attempt to configure the LVTM port by programming
the RS780E’s registers directly.
Figure 2-5, “LVTM Interface of the RS780E,”
compares the functions of the pins in
LVDS and TMDS mode. Operations in the LVDS and TMDS mode are explained in
section 2.4, “LVDS‚’ on page 2-7
,
and
section 2.5, “DVI/HDMI™‚’ on page 2-13
, respectively.
Figure 2-5 LVTM Interface of the RS780E
Notice that the RS780E can also provide a TMDS output via its TMDS interface that is multiplexed with its PCI Express
graphics link. As a result, the RS780E can provide two digital display outputs using its two on-chip integrated TMDS
transmitters—one through the LVTM interface, and the other through the TMDS interface multiplexed with the PCI-E
graphics interface.
TXOUT_U0N/P
TXOUT_U1N/P
TXOUT_U2N/P
TXCLK_LN/P
TXOUT_L0N/P
TXCLK_UN/P
TXOUT_L1N/P
TXOUT_L2N/P
LVDS_DIGON
LVDS_BLON
LVDS_BLEN
LVDS upper data channel 0
LVDS upper data channel 2
LVDS lower clock channel
LVDS lower data channel 0
LVDS upper clock channel
LVDS lower data channel 1
LVDS lower data channel 2
LVDS_DIGON
LVDS_BLON
LVDS_BLEN
LVDS upper data channel 3
TXOUT_U3N/P
LVDS upper data channel 1
TXOUT_U0N/P
TXOUT_U1N/P
TXOUT_U2N/P
TXCLK_LN/P
TXOUT_L0N/P
TXCLK_UN/P
TXOUT_L1N/P
TXOUT_L2N/P
LVDS_DIGON
LVDS_BLON
LVDS_BLEN
TMDS data channel 0
TMDS data channel 2
NC
TMDS data channel 4
TMDS clock channel
TMDS data channel 5
NC
GPIO3
GPIO2
GPIO4
TMDS data channel 3
TXOUT_U3N/P
TMDS data channel 1
TXOUT_L3N/P
LVDS lower data channel 3
TXOUT_L3N/P
NC
LVTM Interface in LVDS Mode
LVTM Interface in TMDS Mode