Ampro Corporation Littleboard 550 用户手册

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Reference Manual

LittleBoard 550

The LittleBoard 550 offers three VIA Technologies Eden processor choices; high performance 1GHz
ESP 10000 processor, 533MHz ESP 5000 processor, or the low cost, 300MHz ESP3000 processor.

The ESP (0.13

µ or 0.15µ) processors at 1GHz, 533MHz, or 300MHz use 133MHz, 133MHz, or 66MHz

FSB (front side bus) respectively, with 128kB Level 1 cache and 64kB Level 2 cache.  The ESP
processors require a heatsink, but no fan.

A CPU fan connector is provided for your convenience to
accommodate any special requirements.  See Table 3-28.

The LittleBoard 550 memory consists of the following elements:

•

SDRAM

•

Flash memory

•

Serial EEPROM (SEEP)

The LittleBoard 550 supports a single standard 168-pin DIMM slot.

• DIMM slot can support up to 2GB of memory
• Supports PC 133 (133MHz, 7.5ns) and PC 100 (100MHz, 10ns)
• +3.3V SDRAM

Ampro recommends using only PC 133 (133MHz), 3.3V, 7.5ns, 168-
pin, SDRAM DIMM, but PC 100 (100MHz, 10ns) will function.  PC
133 provides the best performance for the Eden processors.

There is an 8-bit wide, 512kB flash device used for system BIOS that is connected to the Southbridge,
VT82C686B, through an ISA bus transceiver.  The BIOS is re-programmable and the supported features
are detailed in Chapter 4, BIOS Setup.

The 2-wire Serial EEPROM (SEEP) contains 4k-bits and at least 512-bit area is reserved for the user.
The SEEP is used to store system parameters for battery-free boot capability when there is no battery
present.  The SEEP uses the SMBus as its 2-wire interface.