DS90UH949-Q1 Datasheet, PDF (58/87 Pages) Texas Instruments – 1080p HDMI to FPD-Link III Bridge Serializer with HDCP

DS90UH949-Q1
SNLS453 – NOVEMBER 2014
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Register Maps (continued)
ADD
(dec)
92
ADD
(hex)
0x5C
Register Name
DUAL_CTL2
Bit(s)
7
6
5
4:3
2:0
93
0x5D FREQ_LOW
7
6
5:0
94
0x5E FREQ_HIGH
7
6:0
95
0x5F HDMI Frequency 7:0
Table 10. Serial Control Bus Registers (continued)
Register
Type
RW
RW
RW
RW
RW
RW
RW
RW
R
Default
(hex)
0
0x00
0x02
0
6
44
0x00
Function
Description
DISABLE_DU Disable Dual Swap: Prevents automatic correction of swapped Dual link connection.
AL_SWAP
Setting this bit allows writes to the DUAL_SWAP control in the DUAL_CTL1 register.
FORCE_LINK_ Force Link Ready: Forces link ready indication, bypassing back channel link detection.
RDY
FORCE_CLK_ Force Clock Detect: Forces the HDMI/OpenLDI clock detect circuit to indicate presence
DET
of a valid input clock. This bypasses the clock detect circuit, allowing operation with an
input clock that does not meet frequency or stability requirements.
FREQ_STBL_
THR
Frequency Stability Threshold: The Frequency detect circuit can be used to detect a
stable clock frequency. The Stability Threshold determines the amount of time required
for the clock frequency to stay within the FREQ_HYST range to be considered stable:
00 : 160us.
01 : 640us.
10 : 1.28ms.
11 : 2.55ms.
FREQ_HYST
Frequency Detect Hysteresis: The Frequency detect hysteresis setting allows ignoring
minor fluctuations in frequency. A new frequency measurement will be captured only if
the measured frequency differs from the current measured frequency by more than the
FREQ_HYST setting. The FREQ_HYST setting is in MHz.
Reserved.
HDMI_RST_M HDMI Phy Reset Mode:
ODE
0 : Reset HDMI Phy on change in mode or frequency.
1 : Don't reset HDMI Phy on change in mode or frequency if +5V is asserted.
FREQ_LO_TH Frequency Low Threshold: Sets the low threshold for the HDMI Clock frequency detect
R
circuit in MHz. This value is used to determine if the HDMI clock frequency is too low for
proper operation.
Reserved.
FREQ_HI_TH Frequency High Threshold: Sets the high threshold for the HDMI Clock frequency detect
R
circuit in MHz.
HDMI_FREQ
HDMI frequency:
Returns the value of the HDMI frequency in MHz. A value of 0 indicates the HDMI
receiver is not detecting a valid signal.
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