DS90UH947-Q1 Datasheet, PDF (49/87 Pages) Texas Instruments – 1080p OpenLDI to FPD-Link III Serializer with HDCP

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ADD
(dec)
30
ADD
(hex)
0x1E
Register Name
Port Select
31
0x1F Frequency Counter
DS90UH947-Q1
SNLS455 – NOVEMBER 2014
Table 10. Serial Control Bus Registers (continued)
Bit(s)
7:3
2
1
0
7:0
Register
Type
RW
RW
RW
RW
Default
(hex)
0x01
0x00
Function
Description
Reserved.
PORT1_I2C_EN
Port1 I2C Enable: Enables secondary I2C address. The second I2C
address provides access to port1 registers as well as registers that
are shared between ports 0 and 1. The second I2C address value will
be set to DeviceID + 1 (7-bit format). The PORT1_I2C_EN bit must
also be set to allow accessing remote devices over the second link
when the device is in Replicate mode.
PORT1_SEL
Selects Port 1 for Register Access from primary I2C Address. For
writes, Port 1 registers and shared registers will both be written. For
reads, Port 1 registers and shared registers will be read. This bit must
be cleared to read Port 0 registers.
If this bit is set, GPIO[3:0] registers control operation for D_GPIO[3:0]
registers.
This bit is ignored if PORT1_I2C_EN is set.
PORT0_SEL
Selects Port 0 for Register Access from primary I2C Address. For
writes, Port 0 registers and shared registers will both be written. For
reads, Port 0 registers and shared registers will be read. Note that if
PORT1_SEL is also set, then Port 1 registers will be read.
This bit is ignored if PORT1_I2C_EN is set.
Frequency Count Frequency Counter control: A write to this register will enable a
frequency counter to count the number of pixel clock during a
specified time interval. The time interval is equal to the value written
multiplied by the oscillator clock period (nominally 40ns). A read of the
register returns the number of pixel clock edges seen during the
enabled interval. The frequency counter will freeze at 0xff if it reaches
the maximum value. The frequency counter will provide a rough
estimate of the pixel clock period. If the pixel clock frequency is
known, the frequency counter may be used to determine the actual
oscillator clock frequency.
Copyright © 2014, Texas Instruments Incorporated
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