Source Product Description Infoframe; Table 83: Spd Infoframe Configuration Register - Analog Devices ADV7850 Hardware Manual

video_clock_detect, Addr B8 (Main), Address 0xEF[2]
This control is used to enable the HDMI Tx Squelch feature. This should be set to 0 in all analog input modes.
Function
video_clock_detect
1
0 
hs_active_det_en, Addr B8 (Main), Address 0xFE[1]
This control is used to enable HSync activity detection for the HDMI Tx Squelch feature. This should be set to 0 in all analog input
modes.
Function
hs_active_det_en
0 
1

13.6 SOURCE PRODUCT DESCRIPTION INFOFRAME

The Source Product Description (SPD) InfoFrame contains the vendor name and product description. The transmission of SPD
InfoFrames is enabled by setting
fields.
An application of this packet is to allow the sink to display the source information using an OSD. This information is in a 7-bit ASCII
format. Refer to the CEA 861 specification for more details.
spd_pkt_en, Addr B8 (Main), Address 0x40[6]
This control is used to enable an SPD packet.
Function
spd_pkt_en
0 
1
Tx Packet Memory
Map Address
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
Rev. A May 2012
Description
Disable TMDS Clock detection (and HSync activity Detect)
Enable TMDS clock detection (and HSync Activity Detect if enabled)
Description
Disable HSync Activity Detect
Enable HSync activity Detect
spd_pkt_en to 1. When it is set, the HDMI Tx section transmits one SPD packet once every two video
Description
Disable SPD packet
Enable SPD packet

Table 83: SPD InfoFrame Configuration Register

Access Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Register Name Default Value
spd_hb0[7:0] 0x00
spd_hb1[7:0] 0x00
spd_hb2[7:0] 0x00
spd_pb0[7:0] 0x00
spd_pb1[7:0] 0x00
spd_pb2[7:0] 0x00
spd_pb3[7:0] 0x00
spd_pb4[7:0] 0x00
spd_pb5[7:0] 0x00
spd_pb6[7:0] 0x00
spd_pb7[7:0] 0x00
spd_pb8[7:0] 0x00
spd_pb9[7:0] 0x00
spd_pb10[7:0] 0x00
spd_pb11[7:0] 0x00
spd_pb12[7:0] 0x00
spd_pb13[7:0] 0x00
352
Byte Name
SPD Header Byte 0
SPD Header Byte 1
SPD Header Byte 2
SPD Data Byte 0
SPD Data Byte 1
SPD Data Byte 2
SPD Data Byte 3
SPD Data Byte 4
SPD Data Byte 5
SPD Data Byte 6
SPD Data Byte 7
SPD Data Byte 8
SPD Data Byte 9
SPD Data Byte 10
SPD Data Byte 11
SPD Data Byte 12
SPD Data Byte 13
ADV7850