EP2AGX95EF29C6N Datasheet, PDF (341/380 Pages) Altera Corporation – Device Interfaces and Integration

Chapter 9: Configuration, Design Security, and Remote System Upgrades in Arria II Devices
Dedicated Remote System Upgrade Circuitry
9–55
Dedicated Remote System Upgrade Circuitry
This section describes the implementation of the Arria II remote system upgrade
dedicated circuitry.
The remote system upgrade circuitry is implemented in hard logic. This dedicated
circuitry interfaces with the user-defined factory and application configurations
implemented in the Arria II device logic array to provide the complete remote
configuration solution. The remote system upgrade circuitry contains the remote
system upgrade registers, a watchdog timer, and a state machine that controls those
components.
Figure 9–25 shows the datapath of the remote system upgrade block.
Figure 9–25. Remote System Upgrade Circuit Data Path (Note 1)
Internal Oscillator
Status Register (SR)
[4..0]
Control Register
[37..0]
Logic Array
Update Register
[37..0] _update
Shift Register
dout _{Bit [4..0]}
din dout
capture
Bit [37..0]
din
capture
RSU
State
time-out
User
Watchdog
Machine
Timer
clkout capture update
Logic Array
clkin
RU_DOUT
RU_SHIFTnLD RU_CAPTnUPDT
RU_CLK RU_DIN RU_nCONFIG RU_nRSTIMER
Logic Array
Note to Figure 9–25:
(1) The RU_DOUT, RU_SHIFTnLD, RU_CAPTnUPDT, RU_CLK, RU_DIN, RU_nCONFIG, and RU_nRSTIMER signals are internally controlled by the
ALTREMOTE_UPDATE megafunction.
July 2012 Altera Corporation
Arria II Device Handbook Volume 1: Device Interfaces and Integration