LAN9353 Datasheet, PDF (338/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
10.7.4.27 Buffer Manager Interrupt Pending Register (BM_IPR)
Register #:
1C21h
Size:
32 bits
This register contains the Buffer Manager interrupt status. The status is double buffered. All interrupts in this register
may be masked via the Buffer Manager Interrupt Mask Register (BM_IMR). Refer to Section 8.0, "System Interrupts,"
on page 84 for more information.
Bits
Description
31:14
13:10
RESERVED
Drop Reason B
When the Status B Pending bit is set, these bits indicate the reason a packet
was dropped per the table below:
Bit
Values
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Description
The destination address was not in the ALR table (unknown or
broadcast) and the Broadcast Buffer Level was exceeded.
Drop on Red was set and the packet was colored Red.
There were no buffers available.
There were no memory descriptors available.
The destination address was not in the ALR table (unknown or
broadcast) and there were no valid destination ports.
The packet had a receive error and was >64 bytes.
The Buffer Drop Level was exceeded.
RESERVED
RESERVED
Drop on Yellow was set, the packet was colored Yellow and was
randomly selected to be dropped.
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
9:8 Source Port B
When the Status B Pending bit is set, these bits indicate the source port on
which the packet was dropped.
00 = Port 0
01 = Port 1
10 = Port 2
11 = RESERVED
Type
RO
RC
RC
Default
-
0000b
00b
DS00001925A-page 338
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