LAN9311 Datasheet, PDF (414/461 Pages) SMSC Corporation – Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
14.5.4.2 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
15:8
7:0
RESERVED
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.
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 2.0 (02-14-13)
414
DATASHEET
SMSC LAN9311/LAN9311i