CDPCLK4 datasheet(218/274 Pages) ALTERA

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Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family

Configuration Features

Cyclone III Device Handbook

August 2012

Altera Corporation

Volume 1

Reconfiguration

After the configuration data is successfully written into the serial configuration

device, the Cyclone III device family does not reconfigure by itself. The intelligent

host issues the PULSE_NCONFIG JTAG instruction to initialize the reconfiguration

process. During reconfiguration, the master device is reset and the SFL design no

longer exists in the Cyclone III device family and the serial configuration device

configures all the devices in the chain with your user design.

f For more information about SFL, refer to AN 370: Using the Serial FlashLoader with

Quartus II Software.

JTAG Instructions

This section describes the instructions that are necessary for JTAG configuration for

the Cyclone III device family. Table 9–17 lists the supported JTAG instructions.

f For more information about the JTAG binary instruction code, refer to the IEEE 1149.1

(JTAG) Boundary-Scan Testing for Cyclone III Devices chapter.

For Cyclone III LS devices, the device can only allow mandatory JTAG 1149.1

instructions after POR. These instructions are BYPASS, SAMPLE/PRELOAD, EXTEST and

FACTORY

. To enable the access of other JTAG instructions, issue the FACTORY instruction.

The FACTORY instruction puts the device in a state in which it is ready for in-house

testing and board-level testing and it must be executed before configuration starts.

When this instruction is executed, the CRAM bits content and volatile key are cleared

and the device is reset.

Table 9–17. JTAG Instructions

JTAG Instruction

Cyclone III Device

Cyclone III LS Device

CONFIG_IO

ACTIVE_DISENGAGE

ACTIVE_ENGAGE

EN_ACTIVE_CLK

—

DIS_ACTIVE_CLK

—

APFC_BOOT_ADDR

—

FACTORY (1)

—

KEY_PROG_VOL (2)

—

KEY_CLR_VREG (2)

—

Notes to Table 9–17:

(1) In Cyclone III LS devices, the CONFIG_IO, ACTIVE_DISENGAGE, PULSE_NCONFIG, and PROGRAM instructions are

supported, provided that the FACTORY instruction is executed. It is not necessary to execute the FACTORY

instruction prior to the JTAG configuration in Cyclone III devices because this instruction is used for Cyclone III LS

devices only.

(2) Use the KEY_PROG_VOL and KEY_CLR_VREG instructions for the design security feature. For more information,

refer to “Design Security” on page 9–70.

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