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MAX9257/MAX9258 Evaluation Kit
range, and the following relationship formula must
be met:
Serial Word Length x Pixel Clock = Serial
Data Rate ≤ 840Mbps
It is preferred to select the pixel clock frequency
before the clock is enabled.
14) To select a different UART speed, change the cam-
era UART speed first and then go to the ECU
Control tab sheet to change the ECU UART speed
accordingly. Ensure that t STO and t ETO values are
set correctly in order for the UART speed to work
properly. The MAX9258 REG07 FAST bit and
MAX9257 REG08 FAST bit should be configured
correctly before going to the never come back
operation.
15) Press the Disable PCLK_IN/HSYNC_IN/VSYNC_IN
button to disable the video clock inputs to the
MAX9257. Check that the D1 green LED is turned
off (MAX9258 LOCK pin stays low) and that the
control channel is available indefinitely (MAX9258
CCEN pin stays high).
16) Press the Enable PCLK_IN/HSYNC_IN/VSYNC_IN
button again to enable the video clock inputs to the
MAX9257. Check that the D1 green LED lights up
again.
UART with Finite CTO Operation
If t CTO < t ETO then the MAX9257 and the MAX9258
registers can be accessed and UART communication
with the camera in bypass mode is possible.
1) Start the program or press the Reset the EVKIT
button on the ECU Control tab sheet (Figure 3).
2) If MAX9257 REM is set to high (JU25 shunt is set
across pins 1-2), then press the ECU Wakes Up
MAX9257 button on the ECU Control tab sheet. If
MAX9257 REM is set to low (JU25 shunt is set
across pins 2-3), then skip this step.
3) Navigate to the Deserializer MAX9258 tab sheet
(Figure 4). Press the Read MAX9258 & 9257 button
to refresh the current register values on the GUI.
4) Keep the four Write Both 9258&9257 checkboxes
checked.
5) Set t STO and t ETO on both the MAX9258 and
MAX9257 to desired values. Note that the t STO and
t ETO times are based on pixel clock (PCLK_IN)
time. For example, if PCLK_IN is 30MHz, set
STODIV to 1024 and STOCNT to 0, t STO = (1024 x
1/30)μs ≈ 34μs. Set ETODIV to 1024 and ETOCNT
to 9, t ETO = (1024 x 10/30)μs ≈ 340μs.
6) Set t CTO on both MAX9258 and MAX9257 to
desired values. Note that the t CTO time is based on
the UART bit time. For example, if the UART speed
is 400kbps, set CTO to 64, t CTO = (64 x 2.5)μs =
140 μs.
7) Set other MAX9258 registers as desired.
8) Navigate to the Serializer MAX9257 tab sheet
(Figure 5). Select enable in the SEREN drop-down
list within the Reg04 controls if it is not enabled.
9) Select enable in the INTEN drop-down list within the
Reg08 controls on the Serializer MAX9257 tab
sheet. INTEN is changed in both MAX9258 and
MAX9257 when the INTEN drop-down list is
changed on either tab sheet.
10) Press the Read button to read back the contents of
Reg08. Ensure that the INTEN drop-down list dis-
plays disabled because CTO expired by the time
the read operation executed and STO/ETO are not
counting yet since the pixel clock is not activated.
11) Navigate to the Camera Control tab sheet (Figure
6). On this tab sheet, all ECU commands to the
camera follow this order in one control-channel ses-
sion:
a) SYNC frame
b) Set MAX9258 INTEN to 1
c) Wait for 15 UART bit times
d) Set MAX9257 INTEN to 1
e) ECU command to the camera
After every command, CTO expires first because of
t CTO < t ETO . This resets INTEN on both MAX9258
and MAX9257 to 0 so that they become accessible
again when the next control channel is available.
12) Press the Turn On D4 , Turn Off D4 , Fast Blink D4 ,
and Slow Blink D4 buttons to verify that the ECU
communicates to the camera properly.
13) Press the Enable PCLK_IN/HSYNC_IN/VSYNC_IN
button to enable the pixel clock, the horizontal syn-
chronization clock, and the vertical synchronization
clock. The frequencies are displayed in the
Onboard PCLK_IN, HSYNC_IN, VSYNC_IN Status
group box.
14) Use an oscilloscope to check that CCEN is toggling
and the D1 green LED is lit (MAX9258 LOCK pin is
asserted high).
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