Altera Cyclone III Development Board - Manual (Page 29)

Chapter 2: Board Components 2–19
Configuration, Status, and Setup Elements
© March 2009 Altera Corporation Cyclone III 3C120 Development Board Reference Manual
■ POWER SELECT rotary switch
■ PGM CONFIG SELECT rotary switch
■ Speaker header
JTAG Control DIP Switch
Board reference SW3 is a 4-position JTAG control DIP switch, and it is provided to
either remove or include devices in the active JTAG chain. Additionally, JTAG control
DIP switch is also used to disable the embedded USB-Blaster cable when using an
external USB-Blaster cable (
Table 2–10 ).
Because the JTAG chain also contains the two HSMC, the SW3 DIP switch allows data
to bypass the HSMC interfaces as well as the MAX II CPLD. See
“FPGA Programming
Over USB” on page 2–15 .
f
For information about user-defined DIP switches, refer to “User-Defined DIP
Switches” on page 2–27 .
Table 2–11 lists the JTAG control switch component reference and manufacturing
information.
Table 2–10. JTAG Control DIP Switch Signal Name and Description
DIP Switch Signal Name Description
SW3.1 FPGA_BYPASS Includes or removes FPGA from embedded USB-Blaster
JTAG chain.
1 – FPGA included in JTAG chain
0 – FPGA not included in JTAG chain
SW3.2 HSMA_BYPASS Includes or removes HSMA Port from embedded
USB-Blaster JTAG chain.
1 – HSMA Port included in JTAG chain
0 – HSMA Port not included in JTAG chain
SW3.3 HSMB_BYPASS Includes or removes HSMB Port from embedded
USB-Blaster JTAG chain.
1 – HSMB Port included in JTAG chain
0 – HSMB Port not included in JTAG chain
SW3.4 MAX_EN Enables embedded USB-Blaster JTAG chain.
1 – Embedded USB-Blaster connected to JTAG chain
0 – Embedded USB-Blaster disconnected from JTAG chain
Table 2–11. JTAG Control Switch Component Reference and Manufacturing Information
Board
Reference Description Manufacturer
Manufacturing
Part Number
SW3 Four-position slider DIP switch C&K Components ITT industries TDA04H0SB1