Ampro Corporation Littleboard 550 manual CPU U1, Sdram Memory DIMM1, Flash Memory U17

Chapter 3 Hardware

CPU (U1)

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.

ESP Processors

The ESP (0.13∝ or 0.15∝) 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.

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

Memory

The LittleBoard 550 memory consists of the following elements:

•SDRAM

•Flash memory

•Serial EEPROM (SEEP)

SDRAM Memory (DIMM1)

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

NOTE	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.

Flash Memory (U17)

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.

Serial EEPROM (SEEP)

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.

22 Reference Manual LittleBoard 550