EP4SE360F35I4 Datasheet, PDF (393/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

Chapter 10: Configuration, Design Security, and Remote System Upgrades in Stratix IV Devices
Dedicated Remote System Upgrade Circuitry
10–57
Dedicated Remote System Upgrade Circuitry
This section describes the implementation of the Stratix IV remote system upgrade
dedicated circuitry. The remote system upgrade circuitry is implemented in hard
logic. This dedicated circuitry interfaces to the user-defined factory and application
configurations implemented in the Stratix IV 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 10–25 shows the data path for the remote system upgrade block.
Figure 10–25. 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 10–25:
(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.
September 2012 Altera Corporation
Stratix IV Device Handbook
Volume 1