HC4GX15 Datasheet, PDF (574/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–116
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
Table 2–31. Example for the Specifying the Input Reference Clocks (Part 2 of 4)
ALTGX Instances and Settings
ALTGX Setting
ALTGX Instance 1
ALTGX Instance 2
Enable Channel and
Transmitter PLL
Reconfiguration option in the
Reconfig screen
Enabled
Enabled
Assume the following settings Assume the following settings
for ALTGX Instance 1:
for ALTGX Instance 2:
■ Consider that you have set
up the transmitter PLL in the
General screen to run at
3.125 Gbps (main PLL)
■ Consider that you have set
up the transmitter PLL in the
General screen to run at
1 Gbps (main PLL)
■ Consider that you have set
up the input reference clock
frequency of the main PLL
as 156.25 MHz
■ Consider that you have set
up the input reference clock
frequency of the main PLL
as 125 MHz
■ The regular transceiver
channel configured in
ALTGX Instance 1 is
therefore listening to this
main PLL
■ The regular transceiver
channel configured in
ALTGX Instance 2 is
therefore listening to this
main PLL
■ Consider that your intention
is to reconfigure the data
rate of the regular
transceiver channel to
2 Gbps
■ Consider that your intention
is to reconfigure the data
rate of the regular
transceiver channel to
1.250 Gbps
■ Select the Use alternate
Transmitter PLL option to
dynamically reconfigure the
transceiver channel to listen
to an alternate PLL (Channel
Reconfiguration with TX PLL
Select mode)
■ Select the Use alternate
Transmitter PLL option to
dynamically reconfigure the
transceiver channel to listen
to an alternate PLL (Channel
Reconfiguration with TX PLL
Select mode)
Use alternate Transmitter PLL
option in the Reconfig screen
Enabled
■ Set up the alternate
transmitter PLL to run at
2 Gbps
Enabled
■ Set up the alternate
transmitter PLL to run at
1.250 Gbps
■ Set up the logical reference
index of the alternate
transmitter PLL (for
example, 0)
■ Set up the logical reference
index of the alternate
transmitter PLL (for
example: 1)
■ Set up the protocol and
starting channel number
settings
■ Set up the protocol and
starting channel number
settings
■ Consider that you have set
up the input reference clock
of the alternate transmitter
PLL as 125 MHz.
■ Consider that you have set
up the input reference clock
of the alternate transmitter
PLL as 156.25 MHz
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation