Atmel AT91SAM7X-EK, Руководство пользователя

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AT91SAM7X-EK Evaluation Board User Guide 6-1
6195E–ATARM–22-Mar-07
Section 6
Errata
6.1 DM9161A
Ethernet Phy
Connections
The Ethernet interface works as presented in the schematics, but the connections are
not in compliance with Davicom recommendations.
To comply with Davicom recommendations on connecting this device, J27-4 and J27-5
(RJ45 connector, CT) should be connected to the VCCA side of L2. In the current sche-
matics (ETHERNET, Sheet 3/4), the VCCA side of L2 is connected to MN10-1 and
MN10-2 (DM9161A, AVDDR).
For additional information, refer to the Davicom datasheet for DM9161A and associated
Application Notes available on
http://www.davicom.com.tw/ .
6.2 TWI line pullups
for Fast Mode
operation
In order to use the TWI in Fast Mode (up to 400 Kbits/s), the default 10 K
Ω
resistors R38
and R39 should be replaced by smaller values (e.g., 2.2 K
Ω
).
Note that there is no need to change the pull-up resistors if the TWI is used in Standard
Mode (up to 100 Kbits/s).