HC4GX15 Datasheet, PDF (559/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
2–101
ALTGX_RECONFIG MegaWizard Plug-In Manager Setup for Channel and CMU PLL
Reconfiguration Mode
Use the following steps to setup channel and CMU PLL reconfiguration mode in the
ALTGX_RECONFIG MegaWizard Plug-In Manager:
1. Set the What is the number of channels controlled by the reconfig controller?
option in the Reconfiguration settings screen. For more information, refer to
“Total Number of Channels Controlled by the ALTGX_RECONFIG Instance” on
page 2–35.
2. Select the Channel and TX PLL select/reconfig option in the Reconfiguration
settings screen, as shown in Figure 2–47.
The following control signals are always available when you enable the Channel
and TX PLL select/reconfig option:
■ channel_reconfig_done—The dynamic reconfiguration controller asserts
the channel_reconfig_done signal to indicate that all the words of the .mif
have been written into the transceiver.
■ reconfig_address_out[5:0]—This output signal provides the address
value that you can use to read the appropriate word from the .mif. Use the
value at this port in combination with the reconfig_address_en signal to
decide when to write the next word.
The following options are optional and available for selection in the Channel and
TX PLL Reconfiguration screen:
■ reset_reconfig_address—Use this signal to reset the
reconfig_address_out[5:0] value to 0.
■ reconfig_address_en—The ALTGX_RECONFIG instance asserts this
output signal to indicate the change in value on the
reconfig_address_out[5:0] port. This signal only gets asserted after the
dynamic reconfiguration controller completes writing a 16-bit word of the .mif.
■ logical_tx_pll_sel and logical_tx_pll_sel_en—For more
information about these two ports, refer to “The logical_tx_pll_sel and
logical_tx_pll_sel_en Ports” on page 2–109.
■ Through the rx_tx_duplex_sel[1:0] signal, the dynamic reconfiguration
controller has information about whether the targeted transceiver channel is an
Receiver only, Transceiver only, or Receiver and Transmitter configuration.
For more information about this signal, refer to “Dynamic Reconfiguration
Controller Port List” on page 2–11. The .mif also contains information about
the transceiver channel configuration. The ALTGX_RECONFIG MegaWizard
Plug-In Manager asserts the error signal if there is a mismatch between the
rx_tx_duplex_sel[1:0] signal and the .mif contents.
Channel and CMU PLL Reconfiguration Operation
In channel reconfiguration, only a write transaction can occur; no read transactions
are allowed.
1. Set the reconfig_mode_sel[2:0] control signal to 3’b101. When you use this
feature, the dynamic reconfiguration controller requires that you provide the
16-bit words through the .mif on every write transaction.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3