ATEVK1104 Atmel, ATEVK1104 Datasheet - Page 450

• Manufacturer Part Number: ATEVK1104
• Description: KIT DEV/EVAL FOR AVR32 AT32UC3A
• Manufacturer: Atmel
• Series: AVR®32r
• Type: MCUr

Specifications of ATEVK1104

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT32UC3A3
• Data Bus Width: 32 bit
• Interface Type: USB, SPI, USART
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: AVR UC3
• Silicon Core Number: AT32UC3A3256
• Silicon Family Name: AVR
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT32UC3A3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 29-5.
29.5.13.1
32058J–AVR32–04/11
Pin Name
ETXCK_EREFCK
ECRS
ECOL
ERXDV
ERX0 - ERX3
ERXER
ERXCK
ETXEN
ETX0-ETX3
ETXER
RMII Transmit and Receive Operation
Pin Configuration
ETXCK: Transmit Clock
ECRS: Carrier Sense
ECOL: Collision Detect
ERXDV: Data Valid
ERX0 - ERX3: 4-bit Receive Data
ERXER: Receive Error
ERXCK: Receive Clock
ETXEN: Transmit Enable
ETX0 - ETX3: 4-bit Transmit Data
ETXER: Transmit Error
The MII and RMII interface are capable of both 10Mb/s and 100Mb/s data rates as described in
the IEEE 802.3u standard. The signals used by the MII and RMII interfaces are described in
Table
The intent of the RMII is to provide a reduced pin count alternative to the IEEE 802.3u MII. It
uses 2 bits for transmit (ETX0 and ETX1) and two bits for receive (ERX0 and ERX1). There is a
Transmit Enable (ETXEN), a Receive Error (ERXER), a Carrier Sense (ECRS_DV), and a 50
MHz Reference Clock (ETXCK_EREFCK) for 100Mb/s data rate.
The same signals are used internally for both the RMII and the MII operations. The RMII maps
these signals in a more pin-efficient manner. The transmit and receive bits are converted from a
4-bit parallel format to a 2-bit parallel scheme that is clocked at twice the rate. The carrier sense
and data valid signals are combined into the ECRSDV signal. This signal contains information
on carrier sense, FIFO status, and validity of the data. Transmit error bit (ETXER) and collision
detect (ECOL) are not used in RMII mode.
29-5.
MII
EREFCK: Reference Clock
ECRSDV: Carrier Sense/Data Valid
ERX0 - ERX1: 2-bit Receive Data
ERXER: Receive Error
ETXEN: Transmit Enable
ETX0 - ETX1: 2-bit Transmit Data
RMII
AT32UC3A
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