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APPENDIX A: Registers for PCIe8g3 S5
Registers, UI
EDT, Inc.
2017 January 04
18
Registers, UI
0x00–0x7F Indirect
0x00 Command
0x03 Interrupt Status
0x04 Interrupt Enable
Access / Notes:
8-bit read-write / PCD_CMD
Bit
Access
Name
Description
7–4
RW
PCD_STAT_INT_EN
Enables interrupts as defined in registers
and
3
RW
CMD_EN
Set this bit to enable the required DMA channels in
for DMA. When
clear, resets all DMA channels, flushes all FIFOs, and clears all under- and overflow bits.
2–0
–
–
Reserved.
Access / Notes:
8-bit read-only / PCD_STAT
This register is connected to 1Hz test interrupt as an example of interrupts generated by the UI FPGA
on the main board.
Bit
Access
Name
Description
7–4
R only
PCD_STAT_INT
Interrupt bits for the status bits. If the corresponding bit is asserted in
then the
corresponding bit of these four can be asserted to cause a PCI bus interrupt.
The PCI bus interrupt then is caused when the corresponding PCD_STAT signal [bits 3–0] is asserted.
To reset the interrupt, disable and re-enable the appropriate PCD_STAT_INT_EN bit [7–4] in
3–0
R only
PCD_STAT
The state of user-definable STAT input signals as last sampled.
Access / Notes:
8-bit read-write / PCD_STAT_POLARITY
This register is connected to 1Hz test interrupt as an example of interrupts generated by the UI FPGA
on the main board.
Bit
Access
Name
Description
7–5
–
–
Reserved.
4
RW
PCD_STAT_INT_
ENA
Provides global enable or disable for all interrupt bits [7–4] in
driver to disable and re-enable them in one operation without altering their states. A value of 1 enables
the interrupts; a value of 0 disables them.
3–0
–
[no name]
Reserved.