Ethernet Interfaces; Spi Bus Interface; Spi Flash Memory - SMART Embedded Computing MVME2502 Installation And Use Manual

Functional Description
4.5

Ethernet Interfaces

The MVME2502 has three eTSEC controllers. Each one supports RGMII, GMII, and SGMII
interface to the external PHY. All controllers can only be utilized when using the RGMII
interface. Using the GMII allows only up to two usable controllers.
MVME2502 provides two 10/100/1000 Ethernet interfaces on the front panel and another
two are routed to the RTM through the backplane connector. Due to controller limitations,
one controller is designed to be routed to the front panel or to the RTM. This setting is
possible by using a third party gigabit Ethernet LAN switch with a single enable switch such
as PERICOM's P13L301D. The routing direction is configured through the on-board dip
switch.
The registers of the PHY are accessed through the processor's two-wire Ethernet
management interface.The front panel RJ45 connector has integrated speed and activity
status indicator LEDs. Isolation transformers are provided on the board for each port.
4.6

SPI Bus Interface

The enhanced serial peripheral interface (eSPI) allows the device to exchange data with
peripheral devices such as EEPROMs, RTC, Flash and the like. The eSPI is a full-duplex
synchronous, character-oriented channel that supports a simple interface such as receive,
transmit, clock and chip selects. The eSPI receiver and transmitter each have a FIFO of 32
Bytes.
The P2020 supports up to four chip selects and RapidS full clock cycle operation. It can
operate both full-duplex and half duplex. It works with a range from 4-bit to 16-bit data
characters and is a single-master environment. The MVME2502 is configured such that the
eSPI can operate up to 200 MHz clock rate and can support booting process.The firmware
boot flash resides in the P2020 eSPI bus interface.
4.6.1

SPI Flash Memory

The MVME2502 has two 8 MB on-board serial flash. Both contain the ENV variables and
the U-Boot firmware image, which is about 513 KB in size. Both SPI flash contain the same
programming for firmware redundancy and crisis recovery. The SPI flash is programmed
through the JTAG interface or through an on-board SPI flash programming header.
For information on U-boot and ENV Variables location see
80
Flash Memory Map on page
MVME2502 Installation and Use (6806800R96G)
Functional Description
96.