UG-707
ADV8005 Hardware Reference Manual
dcfifo_kill_dis
, HDMI RX Map,
Address 0xE21B[2]
This bit is used to control whether or not the Video FIFO output is zeroed if there is more than one resynchronization of the pointers within
2 FIFO cycles. This behavior can be disabled with this bit.
Function
dcfifo_kill_dis
Description
0 (default)
FIFO output set to zero if more than one resynchronization is necessary during two FIFO cycles
1
FIFO output never set to zero regardless of how many resynchronizations occur
dcfifo_kill_not_locked
, HDMI RX Map,
Address 0xE21B[3]
This bit control is used to control whether or not the output of the Video FIFO is set to zero when the video PLL is unlocked.
Function
dcfifo_kill_not_locked
Description
0
FIFO data is output regardless of video PLL lock status
1 (default)
FIFO output is zeroed if video PLL is unlocked
The DCFIFO is programmed to reset itself automatically when the video PLL transitions from unlocked to locked. Note that the video PLL
transition does not necessarily indicate that the overall system is stable.
dcfifo_reset_on_lock
, HDMI RX Map,
Address 0xE21B[4]
This bit is used to enable the reset/re-centering of video FIFO on video PLL unlock
Function
dcfifo_reset_on_lock
Description
0
Do not reset on video PLL lock
1 (default)
Reset FIFO on video PLL lock
5.7.
PIXEL REPETITION
In HDMI mode, video formats with TMDS rates below 25 Mpixels/s require pixel repetition in order to be transmitted over the serial video link.
When the
receives this type of video format, it discards repeated pixel data automatically, based on the pixel repetition field available
in the AVI InfoFrame.
When
is non zero, video pixel data is discarded and the pixel clock frequency is divided by hdmi_pixel_repe 1.
hdmi_pixel_repetition[3:0]
, HDMI RX Map,
Address 0xE205[3:0] (Read Only)
This signal is a readback to provide the current HDMI pixel repetition value decoded from the AVI Infoframe received. The HDMI receiver
automatically discards repeated pixel data and divides the pixel clock frequency appropriately as per the pixel repetition value.
Function
hdmi_pixel_repetition[3:0]
Description
0000 (default)
1x
0001
2x
0010
3x
0011
4x
0100
5x
0101
6x
0110
7x
0111
8x
1000
9x
1001
10x
1010 - 1111
Reserved
derep_n_override
, HDMI RX Map,
Address 0xE241[4]
This bit is used to allow the user to override the pixel repetition factor. derep_n is then used instead of hdmi_pixel_repetition[3:0] to discard
video pixel data from the incoming HDMI stream.
Function
derep_n_override
Description
0 (default)
Automatic detection and processing of pixel repeated modes using the AVI infoframe information.
1
Enables manual setting of the pixel repetition factor as per DEREP_N[3:0].
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