HC4GX15 Datasheet, PDF (600/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–142
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Combining Transceiver Channels with Dynamic Reconfiguration Enabled
If you have more than one channel with the Channel and CMU PLL Reconfiguration
option enabled, and if you assign them to different reconfiguration groups without
pin assignments for the tx_dataout pins, the Quartus II software automatically
assigns these channels to different transceiver blocks. If you use a HardCopy IV GX
device with one transceiver block, you cannot compile the design if you assign
different TX PLL reconfig group values for the channels in your design.
Figure 2–59. Reconfiguration Group Setting Required for Channel and CMU PLL Reconfiguration
To understand this assignment setting, assume that you have two transmit channels
in the same transceiver bank with the Channel and CMU PLL Reconfiguration
option enabled. If the transmit output pins are tx_dataout_ch0 and
tx_dataout_ch1, set the assignments shown in Table 2–40 and Table 2–41 to
compile the design.
Table 2–40. tx_dataout_ch0 Reconfiguration Assignment Settings
Assignment
Setting
To:
Assignment Name:
Value:
tx_dataout_ch0
GXB TX PLL Reconfiguration group setting
0
Table 2–41. tx_dataout_ch1 Reconfiguration Assignment Settings
Assignment
To:
Assignment Name:
Value:
Setting
tx_dataout_ch1
GXB TX PLL Reconfiguration group setting
0
Merging Transceiver Channels Listening to Two Transmitter PLLs
Consider that you create an ALTGX instance for a Receiver and Transmitter or
Transmitter Only configuration that has a main and alternate transmitter PLL. If you
want to place other channels in the same transceiver bank, the other channels need to
also have a main and alternate transmitter PLL option to merge successfully.
For example, consider that you create the following instances:
■ ALTGX Instance 1: one channel with a Receiver and Transmitter configuration,
with the main transmitter PLL (assume a logical tx pll value of 0), configured to
6.25 Gbps data rate and the alternate transmitter PLL configured to 2.500 Gbps.
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation