Specifications

Remote System Upgrade Circuitry
The remote system upgrade circuitry contains the remote system upgrade registers, watchdog timer, and a
state machine that controls these components.
If you are using the ALTREMOTE_UPDATE megafunction, the megafunction controls the RU_DOUT,
RU_SHIFTnLD, RU_CAPTnUPDT, RU_CLK, RU_DIN, RU_nCONFIG, and RU_nRSTIMER signals
internally to perform all the related remote system upgrade operations.
Note:
Figure 7-23: Remote System Upgrade Circuitry
Logic Array
Shift Register
Status Register (SR)
[4..0]
Control Register
[37..0]
din
capture
dout
Bit [4..0]
Logic Array
clkout
RU_SHIFTnLD RU_CAPTnUPDT RU_CLK
RU_DIN RU_nCONFIG RU_nRSTIMER
User
Watchdog
Timer
RU_DOUT
capture
clkin
update
Logic Array
capture
din
Bit [37..0]
dout
update
Update Register
[37..0]
Timeout
Remote
System
Upgrade
State
Machine
Internal Oscillator
Related Information
Cyclone V Device Datasheet
Provides more information about remote system upgrade circuitry timing specifications.
Enabling Remote System Upgrade Circuitry
To enable the remote system upgrade feature, follow these steps:
1. Select Active Serial x1 or Configuration Device from the Configuration scheme list in the Configuration
page of the Device and Pin Options dialog box in the Quartus II software.
2. Select Remote from the Configuration mode list in the Configuration page of the Device and Pin Options
dialog box in the Quartus II software.
Enabling this feature automatically turns on the Auto-restart configuration after error option.
Altera-provided ALTREMOTE_UPDATE megafunction provides a memory-like interface to the remote
system upgrade circuitry and handles the shift register read and write protocol in the Cyclone V device logic.
Configuration, Design Security, and Remote System Upgrades in Cyclone V Devices
Altera Corporation
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Remote System Upgrade Circuitry
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2013.06.11