User’s Manual
31
Table A-3 lists the configuration options. 0
Ω
surface mount resistors are used for all the
header positions.
NOTE: Header JP3 is available only on Jackrabbit boards labeled 175-0255. These
boards were introduced in 2003.
Table A-3. Jackrabbit Jumper Configurations
Header
Description
Pins Connected
Factory
Default
JP1
SRAM Size
n.c.
32K
1–2
128K
×
2–3
512K
JP2
Flash Memory Size
1–2
128K/256K
×
2–3
512K
JP3
Flash Memory Bank Select
1–2
Normal Mode
×
2–3
Bank Mode
—
HV3 Sinking/Sourcing
D21
R55
Sinking
R56
Sourcing
×
—
RS-485 Bias and Termination
Resistors (not isnatlled on
BL1820)
R17
Termination resistor
×
R16
R18
Bias resistors
×
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