Tmds Equalization; Port Selection; Fast Switching And Background Port Selection - Analog Devices Advantiv ADV7619 Hardware User's Manual

Hardware User Guide

TMDS EQUALIZATION

The ADV7619 incorporates active equalization of the HDMI data signals. This equalization compensates for the high frequency losses
inherent in HDMI and DVI cabling, especially at long lengths and higher frequencies. The ADV7619 is capable of equalizing for cable
lengths up to 30 meters and for pixel clock frequencies up to 300 MHz.
Note that transition minimized differential signaling (TMDS) equalization frequency of the active HDMI port can be read back in the
TMDSFREQ[8:0] and TMDSFREQ_FRAC[6:0] registers.

PORT SELECTION

HDMI_PORT_SELECT allows the selection of the active HDMI port. This register must be set to activate either HDMI Port A or HDMI
Port B.
HDMI_PORT_SELECT[2:0], Addr 68 (HDMI), Address 0x00[2:0]
This two-bit control is used for HDMI primary port selection.
Function
HDMI_PORT_SELECT[2:0]
000 (default)
001

FAST SWITCHING AND BACKGROUND PORT SELECTION

The ADV7619 incorporates a fast switching feature. This feature allows the user of a system containing the ADV7619 to seamlessly switch
between HDCP encrypted sources. There is no delay in achieving video output which was previously caused by HDCP authentication.
The time required to switch between HDMI sources with HDCP encryption is reduced to a fraction of a second.
If an HDMI port is not selected by HDMI_PORT_SELECT[2:0] then by default this port is disabled. Asserting EN_BG_PORT_A or
EN_BG_PORT_B allows this unselected port to be enabled in background mode. Once a port is in background mode the ADV7619
establishes a HDCP link with its source even though it is not selected by HDMI_PORT_SELECT[2:0]. This background authentication
allows for fast switching of the HDMI ports.
Note that EN_BG_PORT_A and EN_BG_PORT_B have no effect if the port is selected by HDMI_PORT_SELECT.
EN_BG_PORT_A, Addr 68 (HDMI), Address 0x02[0]
Background mode enable for Port A. Sets Port A in background mode to establish a HDCP link with its source even if the port is not
selected by HDMI_PORT_SELECT. This control has no effect if the port is selected by HDMI_PORT_SELECT[2:0].
Function
EN_BG_PORT_A
0 (default)
1
EN_BG_PORT_B, Addr 68 (HDMI), Address 0x02[1]
Background mode enable for Port B. Sets the Port B in background mode to establish a HDCP link with its source even if the port is not
selected by HDMI_PORT_SELECT[2:0]. This control has no effect if the port is selected by HDMI_PORT_SELECT[2:0].
Function
EN_BG_PORT_B
0 (default)
1
The ADV7619 can also perform HDMI parameter measurements on one background port. The following information can then be read
from the background measurement and parameter registers.

BG_TMDSFREQ[8:0]

BG_TMDSFREQ_FRAC[6:0]

BG_DEEP_COLOR_MODE[1:0]

BG_PIX_REP[3:0]

BG_PARAM_LOCK

BG_TOTAL_LINE_WIDTH[13:0]
Description
Port A
Port B
Description
Port disabled, unless selected with
Port enabled in background mode.
Description
Port disabled, unless selected with
Port enabled in background mode.
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HDMI_PORT_SELECT[2:0]
HDMI_PORT_SELECT[2:0]
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