Chassis Plans ATXP-875P, Техническое описание

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Chapter 1: Pre-Configuration ATXP-875P – Technical Reference
2 Chassis Plans
Special note about operating frequency:
The ATXP-875P has the ability to run at a variety of speeds without the need to
change any crystal, oscillator or jumper.
Step 1 Setting the Jumpers
Your ATXP-875P is equipped with a large number of peripherals. As such, there are a large number of
configuration jumpers on the board. Taken step by step, setting these jumpers is easy. We suggest you review each
section and follow the instructions.
Jumper Types
Jumpers are small copper pins attached to the system board. Covering two pins with a shunt closes the connection
between them. The ATXP-875P examines these jumpers to determine specific configuration information. There are
two different categories of jumpers on the ATXP-875P.
A. Two pin jumpers are used for binary selections such as enable, disable. Instructions for this type of jumper are
open, for no shunt over the pins or closed, when the shunt covers the pins.
B. Three or four pin jumpers are used for multiple selections. Instructions for these jumpers will indicate which two
pins to cover. For example: for JP
x 2-3 the shunt will be covering pins 2 and 3 leaving pins 1 and 4 exposed.
How to identify pin number 1 on Figure 1-1 : Looking to the solder side (The board side without components) of the
PCB (Printed Circuit Board), pin number 1 will have a squared pad
J
. Other pins will have a circular pad
Q
. They
are numbered sequentially.
Double row jumpers are numbered alternately, i.e. pin number 2 is in the other row, but in the same column of pin
number 1. Pin number 3 is in the same row of pin 1, but in the next column and so forth.