8–74
Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
Remote System Upgrade
May 2013
Altera Corporation
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.
shows the data path of the
remote system upgrade block.
Figure 8–33. Remote System Upgrade Circuit Data Path
Notes to
(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
(ALTREMOTE_UPDATE) Megafunction User Guide.
Stat
u
s Register (SR)
Previo
u
s
State
Register 2
Bit[30..0]
Previo
u
s
State
Register 1
Bit[30..0]
C
u
rrent
State
Logic
Bit[31..0]
Internal Oscillator/
CLKUSR
Control Register
Bit [3
8
..0]
Logic
Update Register
Bit [3
8
..0]
u
pdate
Logic
Bit [40..39]
do
u
t
din
Bit [3
8
..0]
do
u
t
din
capt
u
re
Shift Register
clko
u
t capt
u
re
u
pdate
Logic
clkin
RU_DIN
RU_SHIFTnLD
RU_CAPTnUPDT
RU_CLK
(2)
RU_DOUT
RU_nCONFIG
RU_nRSTIMER
Logic Array
RSU
Reconfig
u
ration
State
Machine
User
W
atchdog
Timer
RSU
Master
State
Machine
timeo
u
t
Содержание Cyclone IV
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