LAN9353 Datasheet, PDF (329/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
10.7.4.11 Buffer Manager Random Discard Table Write Data Register
(BM_RNDM_DSCRD_TBL_WDATA)
Register #:
1C0Ah
Size:
32 bits
This register is used to write the Random Discard Weight table.
Note: The Random Discard Weight table is not initialized upon reset or power-up. If a random discard is enabled,
the full table should be initialized by the host.
Bits
Description
31:10
9:0
RESERVED
Drop Probability
These bits specify the discard probability of a packet that has been colored
Yellow by the ingress metering. The probability is given in 1/1024’s. For
example, a setting of 1 is one in 1024 or approximately 0.1%. A setting of all
ones (1023) is 1023 in 1024 or approximately 99.9%.
There are a total of 16 probability entries. Each entry corresponds to a range
of the number of buffers used by the ingress port, as specified in Section
10.7.4.10, "Buffer Manager Random Discard Table Command Register
(BM_RNDM_DSCRD_TBL_CMD)".
10.7.4.12 Buffer Manager Random Discard Table Read Data Register
(BM_RNDM_DSCRD_TBL_RDATA)
Type
RO
R/W
Register #:
1C0Bh
Size:
This register is used to read the Random Discard Weight table.
32 bits
Default
-
00
0000
0000b
Bits
Description
31:10
9:0
RESERVED
Drop Probability
These bits specify the discard probability of a packet that has been colored
Yellow by the ingress metering. The probability is given in 1/1024’s. For
example, a setting of 1 is one in 1024 or approximately 0.1%. A setting of all
ones (1023) is 1023 in 1024 or approximately 99.9%.
There are a total of 16 probability entries. Each entry corresponds to a range
of the number of buffers used by the ingress port, as specified in Section
10.7.4.10, "Buffer Manager Random Discard Table Command Register
(BM_RNDM_DSCRD_TBL_CMD)".
Type
RO
RO
Default
-
00
0000
0000b
 2015 Microchip Technology Inc.
DS00001925A-page 329