![Altera Cyclone IV Device Handbook Download Page 408](http://html1.mh-extra.com/html/altera/cyclone-iv/cyclone-iv_device-handbook_2910785408.webp)
3–10
Chapter 3: Cyclone IV Dynamic Reconfiguration
Dynamic Reconfiguration Controller Port List
November 2011
Altera Corporation
Offset Cancellation Feature
The Cyclone IV GX devices provide an offset cancellation circuit per receiver channel
to counter the offset variations due to process, voltage, and temperature (PVT). These
variations create an offset in the analog circuit voltages, pushing them out of the
expected range. In addition to reconfiguring the transceiver channel, the dynamic
reconfiguration controller performs offset cancellation on all receiver channels
connected to it on power up.
reconfig_address
_out[5..0]
Output
This signal is always available for you to select in the
Channel reconfiguration
screen. This
signal is applicable only in the dynamic reconfiguration modes grouped under
Channel
reconfiguration
mode
including
channel interface
and
Use RX local divider
option.
This signal represents the current address used by the ALTGX_RECONFIG instance when
writing the
.mif
into the transceiver channel. This signal increments by 1, from 0 to the last
address, then starts at 0 again. You can use this signal to indicate the end of all the
.mif
write transactions (
reconfig_address_out[5..0]
changes from the last address to 0 at
the end of all the
.mif
write transactions).
reconfig_address
_en
Output
This is an optional signal you can select in the
Channel reconfiguration
screen. This signal
is applicable only in dynamic reconfiguration modes grouped under the
Channel
reconfiguration
option.
The dynamic reconfiguration controller asserts
reconfig_address_en
to indicate that
reconfig_address_out[5..0]
has changed. This signal is asserted only after the
dynamic reconfiguration controller completes writing one 16-bit word of the
.mif
.
reset_reconfig_
address
Input
This is an optional signal you can select in the
Channel reconfiguration
screen. This signal
is applicable only in dynamic reconfiguration modes grouped under the
Channel
reconfiguration
option.
Enable this signal and assert it for one
reconfig_clk
clock cycle if you want to reset the
reconfiguration address used by the ALTGX_RECONFIG instance during reconfiguration.
reconfig_data
[15..0]
Input
This signal is applicable only in the dynamic reconfiguration modes grouped under the
Channel reconfiguration
option. This is a 16-bit word carrying the reconfiguration
information. It is stored in a
.mif
that you must generate. The ALTGX_RECONFIG instance
requires that you provide
reconfig_data
[15..0]
on every
.mif
write transaction using
the
write_all
signal.
reconfig_reset
Input
You can use this signal to reset all the reconfiguration process in
Channel reconfiguration
mode. Asserting this port will reset all the register in the reconfiguration controller logics.
This port only shows up in
Channel reconfiguration
mode.
If you are feeding into this port, synchronize the reset signal to the
reconfig_clk
domain.
channel_reconfig
_done
Output
This signal goes high to indicate that the dynamic reconfiguration controller has finished
writing all the words of the
.mif
. The
channel_reconfig_done
signal is automatically
deasserted at the start of a new dynamic reconfiguration write sequence. This signal is
applicable only in channel reconfiguration mode.
Notes to
:
(1) Not all combinations of input bits are legal values.
(2) This setting is required for compliance to PCI Express
®
(PIPE) functional mode.
(3) PLL reconfiguration is performed using ALTPLL_RECONFIG controller. Hence it is not selected through the
reconfig_mode_sel[2..0]
port.
(4)
reconfig_reset
will not restart the offset cancellation operation. Offset cancellation only occurs one time after power up and does not occur
when subsequent
reconfig_reset
is asserted.
Table 3–2. Dynamic Reconfiguration Controller Port List (ALTGX_RECONFIG Instance) (Part 7 of 7)
Port Name
Input/
Output
Description
Summary of Contents for Cyclone IV
Page 10: ...x Chapter Revision Dates Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Page 14: ...I 2 Section I Device Core Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Page 274: ...vi Contents Cyclone IV Device Handbook February 2015 Altera Corporation Volume 2...
Page 440: ...iv Contents Cyclone IV Device Handbook December 2016 Altera Corporation Volume 3...
Page 442: ...vi Chapter Revision Dates Cyclone IV Device Handbook December 2016 Altera Corporation Volume 3...
Page 446: ......