LAN9312 datasheet(423/458 Pages) SMSC

Part #	LAN9312

Description	High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

PDF	458 Pages

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Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

SMSC LAN9312

423

Revision 1.2 (04-08-08)

DATASHEET

14.5.4.12

Buffer Manager Random Discard Table Read Data Register (BM_RNDM_DSCRD_TBL_RDATA)

This register is used to read the Random Discard Weight table.

1C0Bh

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

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

14.5.4.10, "Buffer Manager Random Discard Table Command Register

(BM_RNDM_DSCRD_TBL_CMD)".

000h

LAN9312 Datasheet(PDF) 423 Page - SMSC Corporation