Altera Cyclone III Development Board User Manual download pdf (Page 29)

Chapter 2: Board Components 2–19

Configuration, Status, and Setup Elements

■ 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.

Ta bl e 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

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 79 80

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Altera Cyclone III Development Board User Manual Page 29