LAN9303 Datasheet, PDF (328/366 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

13.4.4.12
Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Datasheet
Buffer Manager Random Discard Table Read Data Register (BM_RNDM_DSCRD_TBL_RDATA)
Register #:
1C0Bh
Size:
32 bits
This register is used to read the Random Discard Weight table.
BITS
DESCRIPTION
31:10 RESERVED
9:0 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
13.4.4.10, "Buffer Manager Random Discard Table Command Register
(BM_RNDM_DSCRD_TBL_CMD)".
TYPE
RO
RO
DEFAULT
-
000h
Revision 1.3 (08-27-09)
328
DATASHEET
SMSC LAN9303/LAN9303i