DS90UB913Q_13 Datasheet, PDF (38/63 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – DS90UB913Q/DS90UB914Q 10-100MHz 10/12- Bit DC-Balanced FPD-Link III Serializer and Deserializer with Bidirectional Control Channel

DS90UB913Q, DS90UB914Q
SNLS420B – JULY 2012 – REVISED APRIL 2013
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Image
Sensor
DS90UB913Q
Serializer
Camera Data
10 or 12
DATA
HSYNC
VSYNC
Pixel Clock
SDA
SCL
2
GPO[1:0]
DIN[11:0] or
DIN[9:0]
HSYNC,
VSYNC
PCLK
SDA
SCL
GPO[1:0]
PLL
Camera Unit
Reference Clock
(Ext. OSC/2)
External
Oscillator
GPO3
÷2
GPO2
FPD Link III-
High Speed
DOUT+
RIN+
DOUT-
RIN-
Bi-Directional
Control Channel
DS90UB914Q
Deserializer
ROUT[11:0]
or
ROUT[9:0]
HSYNC,
VSYNC
PCLK
Camera Data
10 or 12
DATA
HSYNC
VSYNC
Pixel Clock
GPIO[3:0]
SDA
SCL
4
GPO[3:0]
SDA
SCL
ECU Module
Microcontroller
Figure 24. DS90UB913/914Q Operation in the External Oscillator Mode
When the DS90UB913Q device is operated using an external oscillator, the GPO3 pin on the DS90UB913Q is
the input pin for the external oscillator. In applications where the DS90UB913Q device is operated from an
external oscillator, the divide-by-2 circuit in the DS90UB913Q device feeds back the divided clock output to the
imager device through GPO2 pin. The pixel clock to external oscillator ratios needs to be fixed for the 12–bit high
frequency mode and the 10–bit mode. In the 10-bit mode, the pixel clock frequency divided by the external
oscillator frequency must be 2. In the 12-bit high frequency mode, the pixel clock frequency divided by
the external oscillator frequency must be 1.5. For example, if the external oscillator frequency is 48MHz in the
10–bit mode, the pixel clock frequency of the imager needs to be twice of the external oscillator frequency, i.e.
96MHz. If the external oscillator frequency is 48MHz in the 12-bit high frequency mode, the pixel clock frequency
of the imager needs to be 1.5 times of the external oscillator frequency, i.e. 72MHz. In this mode, GPO2 and
GPO3 on the Serializer cannot act as the output of the input signal coming from GPIO2 or GPIO3 on the
Deserializer.
DS90UB913/914Q Operation with Pixel Clock from Imager as Reference Clock
The DS90UB913/914Q chipsets can be operated by using the pixel clock from the imager as the reference
clock.Figure 25 shows the operation of the DS90UB913/914Q chipsets using the pixel clock from the imager. If
the DS90UB913Q device is operated using the pixel clock from the imager as the reference clock, then the
imager uses an external oscillator as its reference clock. There are 4 GPIOs on the Serializer and 4 GPIOs on
the Deserializer in this mode.
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