HC4GX15 Datasheet, PDF (502/668 Pages) Altera Corporation – HardCopy IV Device Handbook

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Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Offset Cancellation Control for Receiver Channels
Offset cancellation is automatically executed once every time the device is powered
on. The control logic for offset cancellation is integrated into the dynamic
reconfiguration controller. You must connect the ALTGX_RECONFIG instance to the
ALTGX instances with receiver channels in your design. You must connect the
reconfig_fromgxb, reconfig_togxb, and necessary clock signals to both the
ALTGX_RECONFIG and ALTGX (with receiver channels) instances.
1 For proper device operation, you must always connect the ALTGX_RECONFIG and
ALTGX (with receiver channels) instances.
1 The offset cancellation control functionality remains the same for both regular
transceiver channels and PMA-only channels.
Operation
Every ALTGX instance for Receiver and Transmitter or Receiver only configurations
require that the Offset cancellation for Receiver channels option is enabled in the
Reconfig screen of the ALTGX MegaWizard Plug-In Manager. This option is enabled
by default for the above two configurations, as shown in Figure 2–14. It is disabled for
the Transmitter only configuration.
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation