Advantech PCI-1757UP, Руководство пользователя

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PCI-1757UP User Manual 20
3.3.4 Interrupt Flag Bit
The "interrupt flag" bit is a flag indicating the status of an interrupt. It is a
readable and writable bit. Read the bit value to find the status of the inter-
rupt, and write "1" to this bit to clear the interrupt. This bit must be
cleared in the ISR to service the next incoming interrupt.
3.4 BoardID Switch
Read Base +36 can get the cards BoardID identifier. PCI-1757UP has a
built-in SMD switch (SW1), which is used to define each card’s unique
identifier. You can determine this identity number in the register as
shown in Table 3.6. If there are multiple cards in the same chassis, this
BoardID setting is useful for identifying each card’s device number. PCI-
1757UP’s BoardID switches have been set to 0 at the factory. If you need
to adjust it to other numbers, set the SW1 by referring to the jumper and
SMD switch setting.
ID0: the least significant bit (LSB) of Board ID
ID3: the most significant bit (MSB) of Board ID
X: ignore
Table 3.5: Interrupt Flag Bit Values
F Interrupt status
Read 1 Interrupt occurred
0 No interrupt
Write 1 Clear interrupt
0 Don't care
Table 3.6: BoardID Register
Bit# D7 D6 D5 D4 D3 D2 D1 D0
X X X X ID3 ID2 ID1 ID0