Fes6850, 1) enter the mb pnp mode, 2) modify the data of the registers – Acnodes FES 6850 User Manual
Page 45: 3) exit the mb pnp mode
661 Brea Canyon Rd., Suite 3
Walnut, CA 91789
tel: 909.598.7388, fax: 909.598.0218, www.acnodes.com
© Copyright 2009 Acnodes, Inc.
All rights reserved. Product description and product specifications
are subject to change without notice. For latest product information,
please visit Acnodes’ web site at www.acnodes.com.
FES6850
Fanless Embedded Controller comes with
Intel Celeron M 600MHz Processor
There are three steps to complete the configuration setup: (1) Enter the MB PnP Mode; (2)
Modify the data of configuration registers; (3) Exit the MB PnP Mode. Undesired result may occur
if the MB PnP Mode is not exited normally.
(1) Enter the MB PnP Mode
To enter the MB PnP Mode, four special I/O write operations are to be performed during Wait for
Key state. To ensure the initial state of the key-check logic, it is necessary to perform four write
operations to the Special Address port (2EH). Two different enter keys are provided to select
configuration ports (2Eh/2Fh) of the next step.
(2) Modify the Data of the Registers
All configuration registers can be accessed after entering the MB PnP Mode. Before accessing a
selected register, the content of Index 07h must be changed to the LDN to which the register
belongs, except some Global registers.
(3) Exit the MB PnP Mode
Set bit 1 of the configure control register (Index=02h) to 1 to exit the MB PnP Mode.