Altera Cyclone IV - Dedicated Remote System Upgrade Circuitry

8–74 Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
Remote System Upgrade
Cyclone IV Device Handbook, May 2013 Altera Corporation
Volume 1
Dedicated Remote System Upgrade Circuitry
This section describes the implementation of the Cyclone IV device remote system
upgrade dedicated circuitry. The remote system upgrade circuitry is implemented in
hard logic. This dedicated circuitry interfaces with the user-defined factory
application configurations implemented in the Cyclone 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 state
machines that control those components. Figure 8–33 shows the data path of the
remote system upgrade block.
Figure 8–33. Remote System Upgrade Circuit Data Path
(1)
Notes to Figure 8–33:
(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.
(2) The RU_CLK refers to the ALTREMOTE_UPDATE megafunction block "clock" input. For more information, refer to the Remote Update Circuitry
(ALTREMOTE_UPDATE) Megafunction User Guide.
Status Register (SR)
Previous
State
Register 2
Bit[30..0]
Previous
State
Register 1
Bit[30..0]
Current
State
Logic
Bit[31..0]
Internal Oscillator/
CLKUSR
Control Register
Bit [38..0]
Logic
Update Register
Bit [38..0]
update
Logic
Bit [40..39]
doutdin
Bit [38..0]
doutdin
capture
Shift Register
clkout capture update
Logic
clkin
RU_DIN
RU_SHIFTnLD
RU_CAPTnUPDT
RU_CLK (2) RU_DOUT RU_nCONFIG
RU_nRSTIMER
Logic Array
RSU
Reconfiguration
State
Machine
User
Watchdog
Timer
RSU
Master
State
Machine
timeout