HC4GX15 Datasheet, PDF (498/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–40
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Quartus II MegaWizard Plug-In Manager Interfaces to Support Dynamic
Connecting the reconfig_fromgxb and reconfig_togxb Ports
The reconfig_fromgxb and reconfig_togxb signals in the dynamic
reconfiguration interface must be connected between the ALTGX_RECONFIG
instance and the ALTGX instance to successfully complete the dynamic
reconfiguration process:
■ reconfig_togxb[3:0]—This is an input port of the ALTGX instance and an
output port of the ALTGX_RECONFIG instance. You must connect the
reconfig_togxb[3:0] input port of every ALTGX instance controlled by the
dynamic reconfiguration controller to the reconfig_togxb[3:0] output port of
the ALTGX_RECONFIG instance. For more information, refer to Figure 2–13 on
page 2–41.
■ reconfig_fromgxb—This is an output port in the ALTGX instance and an input
port in the ALTGX_RECONFIG instance. This signal is transceiver-block based.
Therefore, the width of this signal increases in steps of 17 bits per transceiver
block.
In the ALTGX MegaWizard Plug-In Manager, the width of this signal depends on the
following:
■ Whether the channels configured in the ALTGX instance are regular transceiver
channels or PMA-only channels.
■ The number of channels you select in the What is the number of channels? option
in the General screen.
For example, if the channels in the ALTGX instance are regular transceiver channels
and if you select the number of channels as follows:
■ 1 ≤ Channels ≤ 4, then the output port reconfig_fromgxb = 17 bits
■ 5 ≤ Channels ≤ 8, then the output port reconfig_fromgxb = 34 bits
■ 9 ≤ Channels ≤ 12, then the output port reconfig_fromgxb = 51 bits
However, if the channels in the ALTGX instance are PMA-only channels and if you
select the number of channels as follows:
■ Number of PMA-only channels = n, then the output port reconfig_fromgxb =
n*17 bits (for example, reconfig_fromgxb = 6 * 17 bits for 6 PMA-only
channels)
In the ALTGX_RECONFIG MegaWizard Plug-In Manager, the width of this signal
depends on the value you select in the What is the number of channels controlled by
the reconfig controller? option in the Reconfiguration settings screen.
For example, if you select the total number of channels controlled by
ALTGX_RECONFIG instance as follows:
■ 1 ≤ Channels ≤ 4, then the input port reconfig_fromgxb = 17 bits
■ 5 ≤ Channels ≤ 8, then the input port reconfig_fromgxb = 34 bits
■ 9 ≤ Channels ≤ 12, then the input port reconfig_fromgxb = 51 bits
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation