Firmware Redundancy; Figure 4-2 Spi Device Multiplexing Logic - SMART Embedded Computing MVME2500 Installation & Use Manual

Functional Description
The board power should be switched on before programming. The switch S2-8
should also be powered on to successfully detect the SPI Flash chip.
4.6.3

Firmware Redundancy

The MVME2500 uses two physically separate boot devices to provide boot firmware
redundancy. Although the P20x0 provides four SPI Bus chip selects, the P20x0 is only
capable of booting from the SPI Device controlled by Chip Select 0. External SPI
multiplexing logic is implemented on the MVME2500 to accommodate this chipset
limitation.
The MVME2500 FPGA controls the chip select to SPI devices A and B. The FPGA chip
select control is based on the Switch Bank (S2-2).

Figure 4-2 SPI Device Multiplexing Logic

74 MVME2500 Installation and Use (6806800L01S)
Functional Description