HC4GX15 Datasheet, PDF (510/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–52
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
PMA Controls Reconfiguration
The width of the logical_channel_address port depends on the following two
conditions:
■ What number you set in the What is the number of channels controlled by the
reconfig controller? option in the Reconfiguration Settings screen. The maximum
width of this port is 9 bits (because 9 bits are required to represent a maximum
number of 384 channels).
■ Whether the channel controlled by the ALTGX_RECONFIG instance is a regular
transceiver channel or PMA-only channel.
Table 2–23 shows the width of the logical_channel_address port set differently
for regular transceiver channels and PMA-only channels.
Table 2–23. Width of the logical_channel_address Port for Regular Transceiver Channels versus
PMA-Only Channels
Eight Regular Transceiver Channels
Eight PMA-Only Channels
logical_channel_address port width = logical_channel_address port width =
3 bits
5 bits
PMA Controls Reconfiguration
You can reconfigure the following PMA controls:
■ Pre-emphasis settings
■ Equalization settings
■ DC gain settings
■ Voltage output differential (V_OD) settings
CMU Channels
These are CMU PLLs configured in Basic (PMA Direct) functional mode (PMA-only
channels).
For the CMU channels, dynamic reconfiguration involves reconfiguring the
following:
■ PMA controls reconfiguration only
1 For Basic (PMA Direct) ×1 and ×N configurations, only PMA controls reconfiguration
is available.
The following dynamic reconfigurations CANNOT be achieved for the CMU
channels in the HardCopy IV GX device:
■ ×1 to ×N, or vice versa
■ ×N mode to another ×N mode
1 PMA controls reconfiguration is available for both regular transceiver channels and
CMU channels.
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation