CDPCLK7 datasheet(242/274 Pages) ALTERA

242 / 274 page

9–84

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

Remote System Upgrade

Cyclone III Device Handbook

August 2012

Altera Corporation

Volume 1

Table 9–29 lists the contents of the previous state register 1 and previous state register

2 in the status register when the MSEL pin setting is set to the AS or AP scheme. The

status register bit in Table 9–29 shows the bit positions in a 31-bit register. The

previous state register 1 and previous state register 2 have the same bit definitions.

The previous state register 1 reflects the current application configuration and the

previous state register 2 reflects the previous application configuration.

If a capture is inappropriately done, for example, capturing a previous state before the

system has entered remote update application configuration for the first time, a value

will output from the shift register to indicate that the capture was incorrectly called.

Remote System Upgrade State Machine

The remote system upgrade control and update registers have identical bit

definitions, but serve different roles (Table 9–26 on page 9–81). While both registers

can only be updated when the device is loaded with a factory configuration image,

the update register writes are controlled by the user logic, and the control register

writes are controlled by the remote system upgrade state machine.

In factory configurations, the user logic should send the option bits (Cd_early and

Osc_int

), the configuration address, and watchdog timer settings for the next

application configuration bit to the update register. When the logic array

configuration reset (RU_nCONFIG) goes high, the remote system upgrade state machine

updates the control register with the contents of the update register and starts system

reconfiguration from the new application page.

Table 9–29. Remote System Upgrade Previous State Register 1 and Previous State Register 2

Contents in Status Register (1)

Status Register Bit

Definition

Description

nCONFIG

source

One-hot, active-high field that

describes the reconfiguration source

that caused the Cyclone III device

family to leave the previous application

configuration. If there is a tie, the

higher bit order indicates precedence.

For example, if nCONFIG and remote

system upgrade nCONFIG reach the

reconfiguration state machine at the

same time, the nCONFIG precedes the

remote system upgrade nCONFIG.

CRC error source

nSTATUS

source

User watchdog timer source

Remote system upgrade nCONFIG

source

25:24

Master state machine current state

The state of the master state machine

during reconfiguration causes the

Cyclone III device family to leave the

previous application configuration.

23:0

Boot address

The address used by the configuration

scheme to load the previous

application configuration.

Note to Table 9–29:

(1) The MSEL pin settings are in the AS configuration scheme.

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