HC4GX15 Datasheet, PDF (506/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–48
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Offset Cancellation Control for Receiver Channels
Example for the Offset Cancellation Process of a Receiver Channel
You must always connect the ALTGX_RECONFIG instance to the ALTGX instances.
Even if you do not require dynamic reconfiguration, you must set the options
described in Table 2–21.
Table 2–21 describes the various ALTGX_RECONFIG and ALTGX MegaWizard
Plug-In Manager settings that you must set to perform the offset cancellation process
of a receiver channel.
Table 2–21. Example for the Offset Cancellation Process of a Receiver Channel
ALTGX Setting and Instances
ALTGX_RECONFIG Settings and Instance
ALTGX Setting
ALTGX Instance 1
ALTGX Instance 2
ALTGX_RECONFIG
Setting
ALTGX_RECONFIG
Instance 1
What is the number of
channels? option in
the General screen
What is the starting
channel number?
option in the Reconfig
screen.
For more information,
refer to “Logical
Channel Addressing”
on page 2–23.
5
(Regular transceiver
channels)
■ Set this option to 0.
■ The logical channel
addresses of the 1st
to 5th channels are
0, 1, 2, 3, and 4,
respectively.
3
(Regular transceiver
channels)
■ Set this option to 8.
■ The logical channel
addresses of the 1st
to 3rd channels are
8, 9, and 10,
respectively.
What is the number of
channels controlled
by the reconfig
controller? option in
the Reconfiguration
settings screen.
For more information
about this setting,
refer to “Total Number
of Channels Controlled
by the
ALTGX_RECONFIG
Instance” on
page 2–35.
■ Determine the
highest logical
channel address
(10).
■ Round it up to the
next multiple of 4.
■ Set this option to
12.
reconfig_
fromgxb1 and
reconfig_
fromgxb2 outputs.
reconfig_
fromgxb1 is 34 bits
wide (2 * 17)
reconfig_
fromgxb2 is 17 bits
wide (1 * 17)
reconfig_
fromgxb input
reconfig_
fromgxb is 51 bits
wide (3 * 17, 12
channels can logically
fit into 3 transceiver
blocks)
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation