2–22
Chapter 2: Cyclone IV Reset Control and Power Down
Simulation Requirements
September 2014
Altera Corporation
The deassertion of the
busy
signal indicates proper completion of the offset
cancellation process on the receiver channel.
Simulation Requirements
The following are simulation requirements:
■
The
gxb_powerdown
port is optional. In simulation, if the
gxb_powerdown
port is not
instantiated, you must assert the
tx_digitalreset
,
rx_digitalreset
, and
rx_analogreset
signals appropriately for correct simulation behavior.
■
If the
gxb_powerdown
port is instantiated, and the other reset signals are not used,
you must assert the
gxb_powerdown
signal for at least 1
s for correct simulation
behavior.
■
You can deassert the
rx_digitalreset
signal immediately after the
rx_freqlocked
signal goes high to reduce the simulation run time. It is not necessary to wait for
t
LTD_Auto
(as suggested in the actual reset sequence).
■
The
busy
signal is deasserted after about 20 parallel
reconfig_clk
clock cycles in
order to reduce simulation run time. For silicon behavior in hardware, you can
follow the reset sequences described in the previous pages.
Figure 2–13. Sample Reset Sequence of a Receiver and Transmitter Channels-Receiver CDR in Automatic Lock Mode
with the Optional gxb_powerdown Signal
Notes to
(1) The
gxb_powerdown
signal must not be asserted during the offset cancellation sequence.
(2) For t
LTD_Auto
duration, refer to the
(3) The
busy
signal is asserted and deasserted only during initial power up when offset cancellation occurs. In subsequent reset sequences, the
busy
signal is asserted and deasserted only if there is a read or write operation to the ALTGX_RECONFIG megafunction.
Output Status Signals
4
5
6
7
8
3
2
busy
(3)
1
Reset/Power Down Signals
gxb_powerdown
pll_areset
tx_digitalreset
rx_analogreset
rx_digitalreset
pll_locked
rx_freqlocked
1
µ
s
t
LTD_Auto
(2)
Summary of Contents for Cyclone IV
Page 10: ...x Chapter Revision Dates Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Page 14: ...I 2 Section I Device Core Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Page 274: ...vi Contents Cyclone IV Device Handbook February 2015 Altera Corporation Volume 2...
Page 440: ...iv Contents Cyclone IV Device Handbook December 2016 Altera Corporation Volume 3...
Page 442: ...vi Chapter Revision Dates Cyclone IV Device Handbook December 2016 Altera Corporation Volume 3...
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