SMSC LAN9311 User Manual
Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08)
414
SMSC LAN9311/LAN9311i
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.
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.
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