CDPCLK4 datasheet(221/274 Pages) ALTERA

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

9–63

Configuration Features

August 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

■

To allow the controllers to properly recognize a successful JTAG programming

that results in the device reaching user mode

The ACTIVE_DISENGAGE instruction is required before JTAG programming regardless

of the current state of the Cyclone III device family if the MSEL pins are set to an

active configuration scheme (AS or AP). If the ACTIVE_DISENGAGE instruction is issued

during a passive configuration scheme (PS or FPP), it has no effect on the Cyclone III

device family. Similarly, the CONFIG_IO instruction is issued after an

ACTIVE_DISENGAGE

instruction, but is no longer required to properly halt

configuration. Table 9–20 lists the required, recommended, and optional instructions

for each configuration mode. The ordering of the required instructions is a hard

requirement and must be met to ensure functionality.

In AS or AP configuration schemes, the ACTIVE_DISENGAGE instruction puts the active

configuration controllers into idle state. If a successful JTAG programming is

executed, the active controllers are automatically re-engaged after user mode is

reached using JTAG programming. This causes the active controllers to transition to

their respective user mode states.

If JTAG programming fails to get the Cyclone III device family to enter user mode and

re-engage active programming, there are available methods to achieve this for the AS

or AP configuration schemes:

■

When in the AS configuration scheme, you can re-engage the AS controller by

moving the JTAG TAP controller to the reset state or by issuing the ACTIVE_ENGAGE

instruction.

■

When in the AP configuration scheme, the only way to re-engage the AP controller

is to issue the ACTIVE_ENGAGE instruction. In this case, asserting the nCONFIG pin

does not re-engage either active controller.

Table 9–20. JTAG Programming Instruction Flows (1)

JTAG Instruction

Configuration Scheme and Current State of the Cyclone III Device

Prior to User Mode

(Interrupting

Configuration)

User Mode

Power Up

FPP

(2)

FPP

(2)

FPP

(2)

FACTORY

ACTIVE_DISENGAGE

CONFIG_IO

Other JTAG instructions

JTAG_PROGRAM

CHECK_STATUS

JTAG_STARTUP

JTAG TAP Reset/ other instruction

Notes to Table 9–20:

(1) “R” indicates that the instruction is required to be executed before the next instruction, “O” indicates the optional instruction, “Rc” indicates

the recommended instruction, and “NA” indicates that the instruction is not allowed to be executed in this mode.

(2) AP configuration is for Cyclone III devices only.

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