MAX9257AEVKIT# Maxim Integrated, MAX9257AEVKIT# Datasheet - Page 9

• Manufacturer Part Number: MAX9257AEVKIT#
• Description: Interface Development Tools MAX9257A Eval Kit
• Manufacturer: Maxim Integrated
• Type: Serializers / Deserializersr
• Series: MAX9257A, MAX9258Ar

Specifications of MAX9257AEVKIT#

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX9257A
• Interface Type: I2C, UART
• Operating Supply Voltage: 5 V

14) To select a different UART speed, change the cam-
15) Press the Disable PCLK_IN/HSYNC_IN/VSYNC_IN
16) Press the Enable PCLK_IN/HSYNC_IN/VSYNC_IN
If t
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
2) If MAX9257A REM is set to high (JU25 shunt is set
3) Navigate to the Deserializer MAX9258A tab sheet
4) Keep the four Write Both 9258A&9257A checkbox-
5) Set t
CTO
should be in the range of the configured PRATE
range, and the following relationship formula must
be met:
It is preferred to select the pixel clock frequency
before the clock is enabled.
era UART speed first and then go to the ECU
Control tab sheet to change the ECU UART speed
accordingly. Ensure that t
set correctly in order for the UART speed to work
properly. The MAX9258A REG07 FAST bit and
MAX9257A REG08 FAST bit should be configured
correctly before going to the never come back
operation.
button to disable the video clock inputs to the
MAX9257A. Check that the D1 green LED is turned
off (MAX9258A LOCK pin stays low) and that the
control channel is available indefinitely (MAX9258A
CCEN pin stays high).
button again to enable the video clock inputs to the
MAX9257A. Check that the D1 green LED lights up
again.
button on the ECU Control tab sheet (Figure 3).
across pins 1-2), then press the ECU Wakes Up
MAX9257A button on the ECU Control tab sheet. If
MAX9257A REM is set to low (JU25 shunt is set
across pins 2-3), then skip this step.
(Figure 4). Press the Read MAX9258A & 9257A
button to refresh the current register values on the
GUI.
es checked.
MAX9257A to desired values. Note that the t
and t
time. For example, if PCLK_IN is 30MHz, set
STODIV to 1024 and STOCNT to 0, t
Serial Word Length x Pixel Clock = Serial
< t
STO
ETO
ETO
times are based on pixel clock (PCLK_IN)
and t
then the MAX9257A and the MAX9258A
Data Rate ≤ 840Mbps
_______________________________________________________________________________________
ETO
UART with Finite CTO Operation
on both the MAX9258A and
MAX9257A/MAX9258A Evaluation Kit
STO
and t
ETO
STO
values are
= (1024 x
STO
6) Set t
7) Set other MAX9258A registers as desired.
8) Navigate to the Serializer MAX9257A tab sheet
9) Select enable in the INTEN drop-down list within the
10) Press the Read button to read back the contents of
11) Navigate to the Camera Control tab sheet (Figure
12) Press the Turn On D4, Turn Off D4, Fast Blink D4,
13) Press the Enable PCLK_IN/HSYNC_IN/VSYNC_IN
14) Use an oscilloscope to check that CCEN is toggling
1/30)µs ≈ 34µs. Set ETODIV to 1024 and ETOCNT
to 9, t
desired values. Note that the t
the UART bit time. For example, if the UART speed
is 400kbps, set CTO to 64, t
140 µs.
(Figure 5). Select enable in the SEREN drop-down
list within the Reg04 controls if it is not enabled.
Reg08 controls on the Serializer MAX9257A tab
sheet. INTEN is changed in both MAX9258A and
MAX9257A when the INTEN drop-down list is
changed on either tab sheet.
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.
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 MAX9258A INTEN to 1
c) Wait for 15 UART bit times
d) Set MAX9257A INTEN to 1
e) ECU command to the camera
After every command, CTO expires first because of
t
and MAX9257A to 0 so that they become accessi-
ble again when the next control channel is avail-
able.
and Slow Blink D4 buttons to verify that the ECU
communicates to the camera properly.
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.
and the D1 green LED is lit (MAX9258A LOCK pin is
asserted high).
CTO
CTO
< t
ETO
ETO.
= (1024 x 10/30)µs ≈ 340µs.
on both MAX9258A and MAX9257A to
This resets INTEN on both MAX9258A
CTO
CTO
= (64 x 2.5)µs =
time is based on
9