HC4GX15 Datasheet, PDF (581/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Design Examples: Dynamic Reconfiguration Controller (ALTGX_RECONFIG)
2–123
For more information, refer to “Connecting the reconfig_fromgxb and reconfig_togxb
Ports” on page 2–40.
Dynamically Reconfiguring the tx_vodctrl and rx_eqctrl PMA Controls Using
Method 1
For more information about dynamically reconfiguring the PMA controls using
Method 1, refer to “Write Transaction” on page 2–58 in “Method 1” on page 2–54.
Example 2: Two ALTGX_RECONFIG Instances Connected to Two ALTGX Instances
This design example has two instances of distinct configurations: ALTGX instance 1
with five transceiver channels and ALTGX instance 2 with three transceiver channels.
This configuration requires separate dynamic reconfiguration controllers for the two
instances. This scenario covers the case of multiple dynamic reconfiguration
controllers controlling multiple instances of the ALTGX.
Figure 2–56 shows ALTGX_RECONFIG instance 1 connected to ALTGX instance 1
and ALTGX_RECONFIG instance 2 connected to ALTGX instance 2.
Figure 2–56. PMA Controls Reconfiguration for Example 2
reconfig_clk
read
write_all
tx_vodctrl [2:0]
logical_channel_address [2:0]
reconfig_fromgxb [33:0]
rx_tx_duplex_sel[1:0]
Set the What is the number of
channels controlled by the
reconfig controller? option = 8
reconfig_togxb [3:0]
ALTGX_RECONFIG Instance 1
data_valid
busy
Set the What is the starting
channels number? option = 0
ALTGX Instance 1
(Number of Channels is 5)
reconfig_fromgxb [33:0]
reconfig_clk
read
write_all
logical_channel_address 1:0]
rx_eqctrl [3:0]
reconfig_fromgxb [16:0]
rx_tx_duplex_sel[1:0]
Set the What is the number of
channels controlled by the
reconfig controller? option = 4
reconfig_togxb [3:0]
ALTGX_RECONFIG Instance 2
data_valid
busy
Set the What is the starting
channels number? option = 0
ALTGX Instance 2
(Number of Channels is 3)
reconfig_fromgxb [16:0]
Assume that you want to reconfigure the transmit V_OD PMA control of the second
channel of the ALTGX instance 1 and the receive equalization PMA control of the
third channel of ALTGX instance 2. The following are the steps to set up the
configuration.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3