LAN9313I SMSC [SMSC Corporation], LAN9313I Datasheet - Page 366
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LAN9313I
Manufacturer Part Number
LAN9313I
Description
Three Port 10/100 Managed Ethernet Switch with MII
Manufacturer
SMSC [SMSC Corporation]
Datasheet
1.LAN9313I.pdf
(398 pages)
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Revision 1.2 (04-08-08)
13.3.4.10
BITS
31:5
3:0
4
RESERVED
Random Discard Weight Table RnW
Specifies a read (1) or a write (0) command.
Random Discard Weight Table Index
Specifies the buffer usage range that is accessed.
There are a total of 16 probability entries. Each entry corresponds to a range
of the number of buffers used by the ingress port. The ranges are structured
to give more resolution towards the lower buffer usage end.
Buffer Manager Random Discard Table Command Register (BM_RNDM_DSCRD_TBL_CMD)
This register is used to read and write the Random Discard Weight table. A write to this address
performs the specified access. This table is used to set the packet drop probability verses the buffer
usage.
For a read access, the
(BM_RNDM_DSCRD_TBL_RDATA)
For a write access, the
(BM_RNDM_DSCRD_TBL_WDATA)
VALUES
0000
0001
0010
0100
0101
1000
1001
1010
0011
0110
0111
1011
1100
1101
1110
1111
BIT
Register #:
1C09h
DESCRIPTION
Buffer Manager Random Discard Table Read Data Register
Buffer Manager Random Discard Table Write Data Register
DATASHEET
BUFFER USAGE LEVEL
can be read following a write to this register.
should be written before writing this register.
128 to 159
160 to 191
192 to 223
224 to 255
112 to 127
96 to 111
16 to 23
24 to 31
32 to 39
40 to 47
48 to 55
56 to 63
64 to 79
80 to 95
366
8 to 15
0 to 7
Size:
Three Port 10/100 Managed Ethernet Switch with MII
32 bits
TYPE
R/W
R/W
SMSC LAN9313/LAN9313i
RO
DEFAULT
Datasheet
0b
0h
-
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