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•
S0: Insert J41 to set it HIGH; insert J42 to set it LOW.
•
S1: Insert J32 to set it HIGH; insert J34 to set it LOW (always leave J33 open).
•
S2: Insert J38 to set it HIGH; insert J40 to set it LOW (always leave J39 open).
4.1.3
Pass Programming Through
This option allows the device to be programmed on your own board, through the CDCE(L)9xx EVM, by
simply connecting the SDA/SCL available pins to your programming interface.
•
Insert jumper J23 and J25 and plug in the USB cable (use a 2.0 USB male B termination).
•
Connect the SDA wire and the SCL wire as shown in
region where the jumpers 32, 33, 34, 38, 39, and 40 are placed.
SDA pin:
Connect
terminal's
wire here
Figure 4. EVM Region Showing SDA Pin and SCL Pin Locations
•
Connect the other SDA and SCL wire terminals to your programming interface.
•
The setup is ready; communication with the customer onboard device is now possible.
4.1.4
Input
The CDCE(L)9xx can be driven either from a crystal or from an LVCMOS input signal. If a crystal is
connected, the CDCE(L)9xx can act as a crystal oscillator or as a VCXO with integrated PLLs. Two crystal
footprints allow connecting a smaller 4-pin crystal and a larger 2-pin crystal. This eases the evaluation of
different crystals with different footprint and size. The 2-pin crystal (Y1) on the EVM top side is used as
default.
NOTE: The EVM default is a crystal oscillator with 2-pin crystal (Y1). (See
4.1.4.1
Crystal or VCXO
The following steps are necessary to use the EVM with a crystal or VCXO as reference:
1. General 2-pin crystal or VCXO setup
The 2-pin crystal footprint allows evaluating crystals with a larger size. Larger size crystals usually offer
a wider tuning range for the VCXO functionality.
SCAU022A – July 2007 – Revised July 2010
Copyright © 2007–2010, Texas Instruments Incorporated
Figure
4. This is a zoomed view of the EVM
Figure
1)
CDCE(L)9xx Performance Evaluation Module
EVM Hardware
SCL pin:
Connect
terminal's
wire here
7
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