Artesyn MVME2502 Installation and Use (April 2015) - Manual (Page 94)

Functional Description
MVME2502 Installation and Use (6806800R96E) 94
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, Flash Memory Map , Table 5-2 on
page 112 .
4.6.2 SPI Flash Programming
The MVME2502 has three headers: a 10-pin header for SPI Flash programming, an 80-pin
header for the JTAG connectivity, and a 20-pin JTAG header for ASSET hardware connectivity.
The following options are used to program the on-board flash:
 Using on-board SPI header - The MVME2502 uses the 10-pin header with a Dual SPI Flash
in-circuit programming configuration. The pin connection is compatible with DediProg
SPI Universal Pin Header.
 Using 60-pin external JTAG header - An external JTAG board with a JTAG multiplexer is
compatible with the MVME2502 and is attached using an external cable. It is used to
update the boot loader in the field. Using this method, programming is done through the
JTAG interface or by using the dedicated SPI Flash programming header on the JTAG board.