Imr (Interrupt Mask Register) - Wiznet W7500 Reference Manual

15 14 13 12
res res res res
IR indicates the interrupt status. If IR is not equal to „0x00‟, INTn PIN is asserted low until it
is „0x00‟.
[4] WOL – Magic Packet
When WOL mode is enabled and receives the magic packet over UDP, this bit is set.
[5] PPPoE – PPPoE Close
When PPPoE is disconnected during PPPoE mode, this bit is set.
[6] UNREACH – Destination unreachable
When receiving the ICMP (Destination port unreachable) packet, this bit is set as „1‟.
When this bit is „1‟, Destination Information such as IP address and Port number may
be checked with the corresponding UIPR & UPORTR.
[7] Conflict – IP Conflict
Bit is set as „1‟ when own source IP address is same with the sender IP address in the
received ARP request.
7.5.4

IMR (Interrupt Mask Register)

Address Offset : 0x2104
Reset value : 0x0000_0000
31 30 29 28
res res res res
15 14 13 12
res res res res
IMR is used to mask interrupts. Each bit of IMR corresponds to each bit of IR. When a bit of
IMR is „1‟ and the corresponding bit of IR is „1‟, an interrupt will be issued. In other words, if
a bit of IMR is „0‟, an interrupt will not be issued even if the corresponding bit of IR is „1‟.
[4] Magic Packet
0: Disable Magic Packet Interrupt
1: Enable Magic Packet Interrupt
[5] PPPoE Close Interrupt Mask
0: Disable PPPoE Close Interrupt
1: Enable PPPoE Close Interrupt
W7500 Datasheet Version1.0.0
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IR[7:4]
R R R R
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IMR[7:4]
R/W
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3 2 1 0
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