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H A R D W A R E
When the board is in reset, FPGAs cannot be configured, USB does not function (the host
computer will not be able to communicate with the device), PCI cannot access the FPGA or
configuration functions (the device will still be accessible from PCI, and QL5064 registers can
still be read and written). When in reset, the Spartan configuration FPGA remains configured,
but all of the logic in the device is cleared.
Pressing the “HARD RESET” button, S1, located near the ATX power connector, can trigger
the Power reset. This reset cannot be triggered over PCI or USB. It is also triggered with one or
more voltages on the board fall below, or above a certain threshold. These thresholds are given
below:
Voltage
Min
Max
1.0V (A):
0.94V
1.1V
1.0V (B):
0.94V
1.1V
1.8V:
1.67V
3.8V
3.3V:
2.7V
3.8V
5.0V:
4.0V
5.6V
12V:
--
--
2.5V
2.25V
2.7V
When the board comes out of reset, the micro controller goes through an initialization process
that will cause all current settings to be lost, including clock settings. Also, the configuration
circuit will act as if the board has just powered on and read from the main.txt file to configure
FPGAs.
When reset is triggered, it remains triggered until 55us after all trigger conditions are removed.
This behavior prevents USB from behaving in such a way to permanently disable USB on the
host machine.
Under some conditions, the DN9002K10PCI can fail to be responsive after rapidly asserting
and de-asserting reset, or if the board is powered off and back on very quickly. This behavior is
caused due to a flaw in the micro controller used for the DN9002K10PCI configuration circuit.
This flaw is believed to be mitigated by the reset circuitry on the DN9002K10PCI. If you
experience the behavior please report it to [email protected]
10.2
User Reset
The “USER RESET” circuit is intended for use by the user. When this reset is asserted, the
RESET_*# signal (from the schematic), is asserted to each FPGA. After at least 200ns, this
signal is de-asserted simultaneously to each FPGA. This signal is connected to a regular user IO
on the FPGA, so it is up to the FPGA designer to implement reset correctly within his design.
The User Reset is asserted whenever the “User Reset” button is pressed. This button, S2, is
located just above the USB connector. There is no LED indicating the state of user reset. User
reset is also asserted when the reset vendor request is sent over USB.
DN9002K10PCI User Guide
www.dinigroup.com
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