HC4GX15 Datasheet, PDF (617/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 3: HardCopy IV GX ALTGX_RECONFIG Megafunction User Guide
3–11
Dynamic Reconfiguration
Table 3–4 describes the available options on page 6 of the MegaWizard Plug-In
Manager for your ALTGX_RECONFIG custom megafunction variation.
Make your selections on page 6, then click Next.
Table 3–4. MegaWizard Plug-In Manager Options (Page 6)
ALTGX_RECONFIG
Setting
Enable illegal mode
checking
Enable self recovery
Use
rate_switch_out
port to read out the
current data rate division
Use the
rx_tx_duplex_sel
port to enable RX only,
TX only or duplex
configuration.
Description
Reference
When you select this option, the ALTGX_RECONFIG
MegaWizard Plug-In Manager provides the error output
port. The dynamic reconfiguration controller checks for
specific unsupported options within two reconfig_clk
cycles, de-asserts the busy signal and asserts the error
output port for two reconfig_clk cycles. The dynamic
reconfiguration controller does not execute the
unsupported operation.
“Error Indication in the
ALTGX_RECONFIG MegaWizard
Plug-In Manager” section of the
HardCopy IV GX Dynamic
Reconfiguration chapter in
volume 3 of the HardCopy IV
Device Handbook
When you select this option, the ALTGX_RECONFIG
MegaWizard Plug-In Manager provides the error output
port. The dynamic reconfiguration controller quits an
operation if it did not complete within the expected number
of clock cycles. After recovering from the illegal operation,
the dynamic reconfiguration controller de-asserts the
busy signal and asserts the error output port for two
reconfig_clk cycles.
“Error Indication in the
ALTGX_RECONFIG MegaWizard
Plug-In Manager” section of the
HardCopy IV GX Dynamic
Reconfiguration chapter in
volume 3 of the HardCopy IV
Device Handbook
The rate_switch_out[1:0] signal is available
when you select Data Rate Division in TX mode. You can
read the existing local divider settings of a transmitter
channel at this port. The decoding for this signal is listed
below:
“Data Rate Division in TX mode”
section in the HardCopy IV GX
Dynamic Reconfiguration chapter
in volume 3 of the HardCopy IV
Device Handbook
2’b00—Division of 1
2’b01—Division of 2
2’b10—Division of 4
2’b11—Not supported
You can read or write the receiver and transmitter settings,
or only the receiver settings, or only the transmitter
settings, based on the value you set at the
rx_tx_duplex_sel[1:0] port.
■ 2’b00—Duplex mode
■ 2’b01—RX only mode
“Dynamically Reconfiguring PMA
Controls” section of the
HardCopy IV GX Dynamic
Reconfiguration chapter in
volume 3 of the HardCopy IV
Device Handbook
■ 2’b10—TX only mode
■ 2’b11—Unsupported value (do not use this value)
If you disable the rx_tx_duplex_sel[1:0] port, the
dynamic reconfiguration controller will read or write both
the receiver and transmitter settings.
© June 2009 Altera Corporation
HardCopy IV Device Handbook Volume 3