Chapter 3: Cyclone IV Dynamic Reconfiguration
3–35
Dynamic Reconfiguration Modes
November 2011
Altera Corporation
lists the ALTGX megafunction ports for PLL Reconfiguration mode.
f
For more information about the ALTPLL_RECONFIG megafunction port list,
description and usage, refer to the
Phase-Locked Loop Reconfiguration
(ALTPL_RECONFIG) Megafunction User Guide
.
Table 3–7. ALTGX Megafunction Port List for PLL Reconfiguration Mode
Input/
Output
Description
Comments
pll_areset [n..0]
Input
Resets the transceiver PLL. The
pll_areset
are asserted in two
conditions:
■
Used to reset the transceiver PLL
during the reset sequence. During
reset sequence, this signal is user
controlled.
■
After the transceiver PLL is
reconfigured, this signal is
asserted high by the
ALTPLL_RECONFIG controller. At
this time, this signal is not user
controlled.
You must connect the
pll_areset
port of ALTGX to the
pll_areset
port of the ALTPLL_RECONFIG
megafunction.
The ALTPLL_RECONFIG controller asserts the
pll_areset
port at the next rising clock edge after the
pll_reconfig_done
signal from the ALTGX
megafunction goes high. After the
pll_reconfig_done
signal goes high, the transceiver PLL is reset. When the
PLL reconfiguration is completed, this reset is
performed automatically by the ALTPLL_RECONFIG
megafunction and is not user controlled.
pll_scandata
[n..0]
Input
Receives the scan data input from
the ALTPLL_RECONFIG
megafunction.
The reconfigurable transceiver PLL received the scan
data input through this port for the dynamically
reconfigurable bits from the ALTPLL_RECONFIG
controller.
pll_scanclk
[n..0]
Input
Drives the
scanclk
port on the
reconfigurable transceiver PLL.
Connect the
pll_scanclk
port of the ALTGX
megafunction to the ALTPLL_RECONFIG
scanclk
port.
pll_scanclkena
[n..0]
Input
Acts as a clock enable for the
scanclk
port on the reconfigurable
transceiver PLL.
Connect the
pll_scanclkena
port of the ALTGX
megafunction to the ALTPLL_RECONFIG
scanclk
port.
pll_configupdate
[n..0]
Input
Drives the
configupdate
port on
the reconfigurable transceiver PLL.
This port is connected to the
pll_configupdate
port
from the ALTPLL_RECONFIG controller. After the final
data bit is sent out, the ALTPLL_RECONFIG controller
asserts this signal.
pll_reconfig_done[n..0]
Output
This signal is asserted to indicate the
reconfiguration process is done.
Connect the
pll_reconfig_done
port to the
pll_scandone
port on the ALTPLL_RECONFIG
controller. The transceiver PLL
scandone
output signal
drives this port and determines when the PLL is
reconfigured.
pll_scandataout
[n..0]
Output
This port scan out the current
configuration of the transceiver PLL.
Connect the
pll_scandataout
port to the
pll_scandataout
port of the ALTPLL_RECONFIG
controller. This port reads the current configuration of
the transceiver PLL and send it to the
ALTPLL_RECONFIG megafunction.
(1)
<n>
= (number of transceiver PLLs configured in the ALTGX MegaWizard) - 1.
Содержание Cyclone IV
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