AT91SAM7XC-EK Atmel, AT91SAM7XC-EK Datasheet - Page 29

• Manufacturer Part Number: AT91SAM7XC-EK
• Description: KIT EVAL FOR AT91SAM7XC256/128
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM7XC-EK

• Contents: Evaluation Board, Parallel Cable and CD-ROM
• Processor To Be Evaluated: AT91SAM7XCx
• Data Bus Width: 32 bit
• Interface Type: RS-232, Ethernet, USB
• For Use With/related Products: AT91SAM7XC256, AT91SAM7XC128
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

6.1
6.2
AT91SAM7X-EK Evaluation Board User Guide
DM9161A
Ethernet Phy
Connections
TWI line pullups
for Fast Mode
operation
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/.
In order to use the TWI in Fast Mode (up to 400 Kbits/s), the default 10 K resistors R38
and R39 should be replaced by smaller values (e.g., 2.2 K ).
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).
Section 6
6195E–ATARM–22-Mar-07
Errata
6-1