DS90UB929-Q1 Datasheet, PDF (49/71 Pages) Texas Instruments – 720p HDMI to FPD-Link III Bridge Serializer

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DS90UB929-Q1
SNLS457 – NOVEMBER 2014
Register Maps (continued)
ADD
(dec)
91
ADD
(hex)
0x5B
Register Name
FPD3_CTL1
92
0x5C FPD3_CTL2
93
0x5D FREQ_LOW
Bit(s)
7
6
5
4
3
2
1
0
7
6
5
4:3
2:0
7
6
5:0
Table 8. Serial Control Bus Registers (continued)
Register
Type
RW
RW
RW
RW
RW
RW
RW
RW
RW
Default
(hex)
Strap
1
0
0x00
0x02
0
6
Function
Description
FPD3_COAX_ FPD3 Coax Mode: Enables configuration for the FPD3 Interface cabling type.
MODE
0 : Twisted Pair.
1 : Coax This bit is loaded from the MODE_SEL1 pin at power-up.
Reserved.
RST_PLL_FR Reset FPD3 PLL on Frequency Change: When set to a 1, frequency changes detected
EQ
by the Frequency Detect circuit will result in a reset of the FPD3 PLL.
FREQ_DET_P
LL
Frequency Detect Select PLL Clock: Determines the clock source for the Frequency
detection circuit:
0 : HDMI clock (prior to PLL).
1: HDMI PLL clock.
Reserved.
Reserved.
Reserved.
Reserved.
Reserved.
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.
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