Datasheet
DS90UB903Q, DS90UB904Q
SNLS332E –JUNE 2010–REVISED APRIL 2013
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Table 1. DS90UB903Q Control Registers
Addr
Name Bits Field R/W Default Description
(Hex)
7-bit address of Serializer; 0x58'h
7:1 DEVICE ID
(1011_000X'b) default
0 I
2
C Device ID RW 0xB0'h
0: Device ID is from ID[x]
0 SER ID SEL
1: Register I
2
C Device ID overrides ID[x]
7:3 RESERVED 0x00'h Reserved
Standby mode control. Retains control register data.
Supported only when MODE = 0
2 STANDBY RW 0 0: Enabled. Low-current Standby mode with wake-up
capability. Suspends all clocks and functions.
1 Reset
1: Disabled. Standby and wake-up disabled
DIGITAL 0 1: Resets the device to default register values. Does not
1 RW
RESET0 self clear affect device I
2
C Bus or Device ID
0 1: Digital Reset, retains all register values
0 DIGITAL RESET1 RW
self clear
2 Reserved 7:0 RESERVED 0x20'h Reserved
Reserved 7:6 RESERVED 11'b Reserved
Auto V
DDIO
detect
Allows manual setting of VDDIO by register.
VDDIO Control 5 VDDIO CONTOL RW 1
0: Disable
1: Enable (auto detect mode)
VDDIO voltage set
Only used when VDDIOCONTROL = 0
VDDIO Mode 4 VDDIO MODE RW 1
0: 1.8V
1: 3.3V
I
2
C Pass-Through
I
2
C PASS-
I
2
C Pass-Through 3 RW 1 0: Disabled
3 THROUGH
1: Enabled
RESERVED 2 RESERVED 0 Reserved
Switch over to internal 25 MHz Oscillator clock in the
absence of PCLK
PCLK_AUTO 1 PCLK_AUTO RW 1
0: Disable
1: Enable
Pixel Clock Edge Select:
0: Parallel Interface Data is strobed on the Falling Clock
TRFB 0 TRFB RW 1 Edge.
1: Parallel Interface Data is strobed on the Rising Clock
Edge.
4 RESERVED 7:0 RESERVED 0x80'h Reserved
I
2
C SCL frequency is determined by the following:
f
SCL
= 6.25 MHz / Register value (in decimal)
5 I
2
C Bus Rate 7:0 I
2
C BUS RATE RW 0x40'h
0x40'h = ~100 kHz SCL (default)
Note: Register values <0x32'h are NOT supported.
RW 0xC0'h Deserializer Device ID = 0x60'h
7:1 DES DEV ID
(1100_000X'b) default
6 DES ID
0 RESERVED Reserved
7:1 SLAVE DEV ID RW 0x00'h Slave Device ID. Sets remote slave I
2
C address.
7 Slave ID
0 RESERVED Reserved
8 Reserved 7:0 RESERVED 0x00'h Reserved
9 Reserved 7:0 RESERVED 0x01'h Reserved
A Reserved 7:0 RESERVED 0x00'h Reserved
B Reserved 7:0 RESERVED 0x00'h Reserved
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