Memory Configuration
22
– Configuration
VL-586-1 Reference Manual
Memory Configuration
ROM C
ONFIGURATION
The VL-586-1 on-board ROM socket (U3) accepts 128Kx8 or 512Kx8, 32 pin plastic
PLCC
or 32
pin J-lead ceramic part(s). An extractor tool (such as VersaLogic part number VL-HDW-202) is
required to remove the rectangular
PLCC
device without damage.
The VL-586-1 is sold with two ROM options:
BIOS/Flash Option (-h)
—
BIOS & 512KB Flash Disk System
. Socket U3 contains a Flash chip
with BIOS, Flash Disk System, and a bootable copy of Embedded DOS.
BIOS/Flash Option (-k)
—
BIOS & 2.5M Flash Disk System
. Socket U3 contains a Flash chip
with BIOS, Flash Disk System, and a bootable copy of Embedded DOS. An additional 2M
surface-mount Flash chip is installed on the back side of the board.
There are no configuration jumpers for the ROM sockets.
DRAM C
ONFIGURATION
The on-board DRAM socket (U11) accepts one standard 72-pin
SO DIMM
module. A variety of
sizes may be used (16M, 32M or 64M.) Fast Page Mode and EDO type modules are supported,
provided they are 70ns or faster, and both 5V or 3.3V modules can be used.
The amount of memory is automatically determined by the BIOS when the system is reset. The
only configuration necessary is to jumper the DRAM socket for the correct operating voltage.
Caution
Severe damage will result if a 3.3V memory module is jumpered for 5V. The VL-
586-1 is shipped in the 3.3V position for safety.
Table 4: SO DIMM Supply Voltage Configuration Jumper
Jumper
Block
Description
As
Shipped
V10[1-2]
SO DIMM Supply Voltage (5 Volts)
In
— Connects 5 Volts to SO DIMM Socket
Out
— Disconnects 5 Volts from SO DIMM Socket
Out
V10[2-3]
SO DIMM Supply Voltage (3.3 Volts)
In
— Connects 3.3 Volts to SO DIMM Socket
Out
— Disconnects 3.3 Volts from SO DIMM Socket
In
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