DS90UB913Q, DS90UB914Q
SNLS420B –JULY 2012–REVISED APRIL 2013
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DS90UB913Q
Serializer
DS90UB914Q
Deserializer
FPD Link III-
High Speed
Camera Data
Camera Data
DOUT+
DOUT-
RIN+
RIN-
10 or 12
10 or 12
ROUT[11:0]
or
ROUT[9:0]
HSYNC,
VSYNC
DIN[11:0] or
DIN[9:0]
HSYNC,
VSYNC
DATA
Image
Sensor
DATA
HSYNC
HSYNC
VSYNC
VSYNC
Bi-Directional
PCLK
PCLK
ECU Module
Pixel Clock
Pixel Clock
Control Channel
SDA
SCL
SDA
SCL
2
4
PLL
GPIO[3:0]
GPO[1:0]
GPO[3:0]
Microcontroller
GPO[1:0]
SDA
SCL
SDA
SCL
Camera Unit
GPO3
Reference Clock
(Ext. OSC/2)
÷2
GPO2
External
Oscillator
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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