DS90UB921-Q1 Datasheet, PDF (37/57 Pages) Texas Instruments – 5 - 96 MHz 24-bit Color FPD-Link III Serializer with Bidirectional Control Channel

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ADD
(dec)
25
27
53
100
ADD
(hex)
0x19
REGISTER NAME
SCL Low Time
0x1B BIST BC Error
0x35 FSEL Override
0x64
Pattern Generator
Control
DS90UB921-Q1
SNLS488 – MARCH 2016
Table 7. Serial Control Bus Registers (continued)
BIT(S)
7:0
TYPE
RW
7:0
R
7
RW
6
RW
5:0
RW
7:4
RW
3:1
0
RW
DEFAULT
(hex)
0xA5
0x00
0
0
0
0x10
FUNCTION
DESCRIPTION
SCL LOW Time
I2C SCL Low Time
This field configures the low pulse width of the SCL output when the
Serializer is the Master on the local I2C bus. This value is also used as the
SDA setup time by the I2C Slave for providing data prior to releasing SCL
during accesses over the Bidirectional Control Channel. Units are 40 ns for
the nominal oscillator clock frequency. The default value is set to provide a
minimum 5us SCL low time with the internal oscillator clock running at
32.5MHz rather than the nominal 25MHz.
BIST Back
Channel CRC
Error Counter
BIST Mode Back Channel CRC Error Counter
This error counter is active only in the BIST mode. It clears itself at the start
of the BIST run.
FSEL Register FSEL Override. FSEL value is set by pin or through register.
Override Control _{0: FSEL set by pin 15 at power-up}
1: FSEL is set by register 0x35[6]
FSEL Override This value will be used for FSEL when FSEL Register Override is set
Value
(0x35[7]). See Frequency Mode Optimizations.
RESERVED
Reserved.
Pattern
Generator Select
Fixed Pattern Select
This field selects the pattern to output when in Fixed Pattern Mode. Scaled
patterns are evenly distributed across the horizontal or vertical active
regions. This field is ignored when Auto-Scrolling Mode is enabled. The
following table shows the color selections in non-inverted followed by
inverted color mode
0000: Reserved
0001: White/Black
0010: Black/White
0011: Red/Cyan
0100: Green/Magenta
0101: Blue/Yellow
0110: Horizontally Scaled Black to White/White to Black
0111: Horizontally Scaled Black to Red/Cyan to White
1000: Horizontally Scaled Black to Green/Magenta to White
1001: Horizontally Scaled Black to Blue/Yellow to White
1010: Vertically Scaled Black to White/White to Black
1011: Vertically Scaled Black to Red/Cyan to White
1100: Vertically Scaled Black to Green/Magenta to White
1101: Vertically Scaled Black to Blue/Yellow to White
1110: Custom color (or its inversion) configured in PGRS, PGGS, PGBS
registers
1111: Reserved
Reserved
Pattern
Generator
Enable
Pattern Generator Enable
1: Enable Pattern Generator
0: Disable Pattern Generator
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