LAN9303 Datasheet, PDF (318/366 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

13.4.4.2
Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Datasheet
Buffer Manager Drop Level Register (BM_DROP_LVL)
Register #:
1C01h
Size:
This register configures the overall buffer usage limits.
32 bits
BITS
DESCRIPTION
31:16 RESERVED
15:8 Drop Level Low
These bits specify the buffer limit that can be used per ingress port during
times when 2 or 3 ports are active.
Each buffer is 128 bytes.
Note: A port is “active” when 36 buffers are in use for that port.
7:0 Drop Level High
These bits specify the buffer limit that can be used per ingress port during
times when 1 port is active.
Each buffer is 128 bytes.
Note: A port is “active” when 36 buffers are in use for that port.
TYPE
RO
R/W
R/W
DEFAULT
-
49h
64h
Revision 1.3 (08-27-09)
318
DATASHEET
SMSC LAN9303/LAN9303i