HC4GX15 Datasheet, PDF (470/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–12
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Quartus II MegaWizard Plug-In Manager Interfaces to Support Dynamic
Table 2–2. Dynamic Reconfiguration Controller Port List (ALTGX_RECONFIG Instance) (Part 2 of 9)
busy
Port Name
read
data_valid
error
Input/
Output
Output
Input
Output
Output
Description
This signal is used to indicate the busy status of the dynamic
reconfiguration controller during:
■ Offset Cancellation—After the device powers up, this signal
remains low for the first reconfig_clk clock cycle. It then is
asserted and remains high when the dynamic reconfiguration
controller performs offset cancellation on all the receiver
channels connected to the ALTGX_RECONFIG instance.
De-assertion of the busy signal indicates the successful
completion of the offset cancellation process.
For more information, refer to “Operation” on page 2–44.
■ PMA controls reconfiguration mode—This signal is high when
the dynamic reconfiguration controller performs a read or write
transaction.
■ All other dynamic reconfiguration modes—This signal is high
when the dynamic reconfiguration controller writes the .mif into
the transceiver channel.
Assert this signal for one reconfig_clk clock cycle to initiate a
read transaction. The read port is applicable only to the PMA
controls Reconfiguration mode. The read port is available when
you select Analog controls in the Reconfiguration settings screen
and select at least one of the PMA control ports in the Analog
controls screen.
For more information, refer to “Dynamically Reconfiguring PMA
Controls” on page 2–53.
The data_valid port is applicable only to PMA controls
reconfiguration mode. This port indicates the validity of the data
read from the transceiver by the dynamic reconfiguration controller.
The current data on the output read ports is the valid data ONLY if
data_valid is high.
This signal is enabled when you enable at least one PMA control
port used in read transactions, for example tx_vodctrl_out.
This indicates that an unsupported operation is attempted. You can
select this in the Error checks/Data rate switch screen. The
dynamic reconfiguration controller de-asserts the busy signal and
asserts the error signal for two reconfig_clk cycles when
you attempt an unsupported operation.
For more information, refer to the “Error Indication in the
ALTGX_RECONFIG MegaWizard Plug-In Manager” on page 2–139.
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation