SMSC LAN9312 - Manual (Page 412)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 412 SMSC LAN9312
DATASHEET
14.5.4.2 Buffer Manager Drop Level Register (BM_DROP_LVL)
This register configures the overall buffer usage limits.
Register #: 1C01h Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31:16 RESERVED RO -
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.
R/W 49h
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.
R/W 64h