HC4GX15 Datasheet, PDF (560/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–102
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
2. Set the rx_tx_duplex_sel[1:0] port to enable the transmitter portion, receiver
portion, or receiver and transmitter portion for reconfiguration.
3. Set the logical_channel_address port to specify the logical channel address
of the transceiver channel.
4. Ensure the busy signal is low and assert the write_all signal for one
reconfig_clk clock cycle.
5. Figure 2–47 shows a .mif write transaction when using Channel and CMU PLL
Reconfiguration mode.
Figure 2–47. .mif write transaction in Channel and CMU PLL Reconfiguration Mode
reconfig_mode_sel[1:0]
logical_channel_address[1:0] (1)
rx_tx_duplex_sel[1:0] (2)
reconfig_clk
3’b101
2’b01
2’b00
write_all
busy
reconfig_address_out[5:0]
Addr0
Addr1
Addr37
Addr0
reconfig_address_en
reconfig_data[15:0] (3)
1^st 16-bits
Don’t care
2^nd 16-bits
55^th 16-bits
Don’t care
channel_reconfig_done
Notes to Figure 2–47:
(1) The waveform assumes that the ALTGX_RECONFIG controls two channels. Therefore, the logical_channel_address signal is 2 bits wide.
The logical_channel_address port is set to 2’b01 to reconfigure the second transceiver channel.
(2) The rx_tx_duplex_sel[1:0] port is set to 2’b00 to match the Receiver and Transmitter configuration of the specified transceiver channel.
(3) This waveform assumes that the transceiver channel is configured in Basic mode with the Receiver and Transmitter configuration. Therefore, the
.mif size is 54.
Channel Reconfiguration with TX PLL Select Mode
This section describes the Channel Reconfiguration with TX PLL select mode.
You can reconfigure the data rate of a transceiver channel by switching between the
two CMU PLLs present in a transceiver block and reconfiguring the receiver PLLs.
The two CMU PLLs can be set to different base rates. You can choose one of the CMU
PLLs based on the data rate you want the channel to run at.
You can use the Channel Reconfiguration with TX PLL select mode along with the
CMU PLL Reconfiguration mode. You can first reconfigure the second PLL to the
desired data rate using CMU PLL Reconfiguration mode. Then use Channel
Reconfiguration with TX PLL Select mode to reconfigure the transceiver channel to
listen to the second PLL.
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation