Carlos,
For the DaVinci DVEVM, you can use a pin on the DC4 connector to
isolate the on-board TVP5146 device from the VPFE interface. I would
suggest using a pullup resistor on your daughter card for pin 2 of DC4
(CAPTURE_EN).
However, the pullup resistor should NOT be connected to 3.3V.
The control inputs of the SN74AVCB164245 are referenced to VCCB (the B
side of the Dual Supply Bus Transceiver) which on this board is 1.8V.
The B side connects to the DM644X device. Therefore the pullup resistor
should be connected to 1.8V, which is available on DC4 on pins 41 and
42.
Regards,
Brandon Azbell
Texas Instruments
Senior, Group Technical Staff
Broadband Applications
[EMAIL PROTECTED] email
847.517.4536 voice
847.517.4576 fax
630.561.9593 mobile
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Carlos Ojea
Sent: Tuesday, August 29, 2006 5:30 AM
To: [email protected]
Subject: User inputs on DC4
Hello:
In 'Davinci-DM644x Evaluation Module Technical Reference' page 2-4 I
found:
'User inputs can be driven via daughter card connector DC4 when the on
board level translator is tristate via driven control Capture Enable
signal high on DC4'
So I should connect 3.3v to DC4's line 2 to tristate the level
translator. Right?
Thanks,
Carlos
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