HC4GX15 Datasheet, PDF (587/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Design Examples: Dynamic Reconfiguration Controller (ALTGX_RECONFIG)
2–129
Table 2–35. Data Rate Division in TX Dynamic Reconfiguration Mode for Example 4 (Part 3 of 3)
ALTGX Settings and Instances
ALTGX_RECONFIG Settings and Instance
ALTGX Setting
reconfig_togxb
[3:0] input
Channel and Transmitter
PLL Reconfiguration option
in the Reconfig screen
ALTGX Instance 1
(Basic Functional Mode,
Receiver and Transmitter
Operation Mode)
ALTGX_RECONFIG Setting
ALTGX_RECONFIG
Instance 1
Connect the
reconfig_togxb[3:0]
signals between the ALTGX
instance 1 and
ALTGX_RECONFIG
instance 1.
reconfig_togxb[3:0]
output
Connect the
reconfig_togxb[3:0]
signals between the ALTGX
instance 1 and
ALTGX_RECONFIG
instance 1.
■ Enable this option.
■ This is required to allow
the ALTGX_RECONFIG
instance to modify the
transmitter channel local
divider values
dynamically.
Use the ‘rx_tx_duplex_sel’
port to enable RX only, TX
only, or duplex
configuration option in the
Error checks/Data rate
switch screen
This setting is optional and
not required in the Data Rate
Division in TX mode.
1 The alternate reference clock is not required because one clock source is used. Also, all
data rates can be derived from the 106.25 MHz clock.
1 Create the ALTGX_RECONFIG instance control logic, reset control logic, and the core
fabric logic to handle the data path. For more information about transceiver resets,
refer to “Error Indication in the ALTGX_RECONFIG MegaWizard Plug-In Manager”
on page 2–139.
Example 5: CMU PLL Reconfiguration Mode with ALTGX Instances in Transmitter Only
Configuration
Consider the following scenario:
■ The design has four Transmitter only ALTGX instances in the same transceiver
block.
■ All four instances are configured in Basic functional mode and 2.5 Gbps data rate.
■ All four channels can listen to CMU0 PLL.
■ The input reference clock used by CMU0 PLL is 100 MHz.
■ You want to reconfigure all four channels identically to 2 Gbps together.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3