HC4GX15 Datasheet, PDF (583/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Design Examples: Dynamic Reconfiguration Controller (ALTGX_RECONFIG)
2–125
ALTGX Instances and ALTGX_RECONFIG Instances Connections
Use the following steps to connect the ALTGX and ALTGX_RECONFIG instances:
1. Connect the reconfig_fromgxb signal from each ALTGX instance to the same
signal of the corresponding ALTGX_RECONFIG instance. For more information,
refer to Figure 2–56.
2. Connect the reconfig_togxb signal from each ALTGX_RECONFIG instance to
the same signal of the corresponding ALTGX instance.
Dynamically Reconfiguring the tx_vodctrl PMA Control of ALTGX Instance 1 from
ALTGX_RECONFIG Instance 1 Using Method 1
For more information about dynamically reconfiguring the PMA controls using
Method 1, refer to “Write Transaction” in “Method 1” on page 2–54.
Dynamically Reconfiguring the rx_eqctrl PMA Control of ALTGX Instance 2 from
ALTGX_RECONFIG Instance 2 Using Method 1:
For more information about dynamically reconfiguring the PMA controls using
Method 1, refer to “Write Transaction” in “Method 1” on page 2–54.
Example 3:
One ALTGX_RECONFIG Instance Connected to an ALTGX Instance Stamped Five Times
This design example consists of five channels of transceivers. This configuration has
one dynamic reconfiguration controller to control five channels and includes
stamping five instantiations of one channel ALTGX instance configuration. This
example assumes the instantiation name is ”instance1”.
ALTGX Instance with One Transceiver Channel
Use the following steps for ALTGX instances with one transceiver channel:
1. Set the What is the number of channels? option in the General screen of the
ALTGX MegaWizard Plug-In Manager to 1.
2. Enable the Analog controls (VOD, Pre-emphasis, and Manual Equalization)
option in the Reconfig screen of the ALTGX MegaWizard Plug-In Manager.
3. The reconfig_fromgxb output signal is transceiver block based; the number of
bits for this instance is 17. This is because the number of channels is one and it can
logically fit into a single transceiver block. The reconfig_togxb input signal is a
fixed bus (4 bits wide).
4. Set the What is the starting channel number? option in the Reconfig screen of the
ALTGX MegaWizard Plug-In Manager to 0. For more information, refer to
“Logical Channel Addressing” on page 2–23.
5. Click Finish.
Instantiating Five Transceiver Channels Using the Same ALTGX Instance
When you stamp instance 1 five times, the What is the starting channel number?
options of the other five stamped instances (assume instance2, instance3, instance4,
instance5, and instance6) are 4, 8, 12, and 16, respectively. For more information, refer
to “Logical Channel Addressing” on page 2–23.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3