HC4GX15 Datasheet, PDF (524/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–66
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
If you want to read the existing local divider settings of the transmitter channel, select
the Use 'rate_switch_out' port to read out the current data rate division option in the
Error checks/Data rate switch screen.
Decoding for the rate_switch_out[1:0] output signal is the same as the
rate_switch_ctrl[1:0] input signal.
1 Dynamic rate switch has no effect on the dividers on the receive side of the transceiver
channel. It can be used only for the transmitter.
1 The Data Rate Division in TX mode does not require a .mif.
For more information about read and write transactions, refer to “Data Rate Division
in TX: Operation” in the following section.
Data Rate Division in TX: Operation
The following sections describe the steps involved in write and read transactions for
the Data Rate Division in TX mode.
Data Rate Division in TX: Write Transaction
1. Set the reconfig_mode_sel[2:0] signal to 3’b011 to activate this mode.
2. Set the rate_switch_ctrl[1:0] signal to the corresponding TX local divider
setting.
3. Set the logical_channel_address port to the logical channel address of the
transmitter channel whose local divider settings you want to reconfigure.
4. Ensure that the busy signal is low.
5. Initiate a write transaction by asserting the write_all signal for one
reconfig_clk cycle.
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation