lan9303m Standard Microsystems Corp., lan9303m Datasheet - Page 315
lan9303m
Manufacturer Part Number
lan9303m
Description
Small Form Factor Three Port 10/100 Managed Ethernet Switch With Dual Mii/rmii/turbo Mii
Manufacturer
Standard Microsystems Corp.
Datasheet
1.LAN9303M.pdf
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Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII
Datasheet
SMSC LAN9303M/LAN9303Mi
13.4.3.26.1
Excess Burst Size
This register specifies the maximum excess burst size in bytes. Bursts larger than
this value that exceed the excess data rate are dropped.
Note:
Note:
This register is 16-bits wide.
Committed Burst Size
This register specifies the maximum committed burst size in bytes. Bursts larger
than this value that exceed the committed data rate are subjected to random
dropping.
Note:
Note:
This register is 16-bits wide.
Committed Information Rate (CIR)
These registers specify the committed data rate for the port/priority pair. The rate
is specified in time per byte. The time is this value plus 1 times 20nS.
There are 24 of these registers each 16-bits wide.
Either this value or the Committed Burst Size should be set larger than or
equal to the largest possible packet expected.
All of the Excess Burst token buckets are initialized to this default value.
If a lower value is programmed into this register, the token buckets will
need to be normally depleted below this value before this value has any
affect on limiting the token bucket maximum values.
Either this value or the Excess Burst Size should be set larger than or
equal to the largest possible packet expected.
All of the Committed Burst token buckets are initialized to this default
value. If a lower value is programmed into this register, the token buckets
will need to be normally depleted below this value before this value has
any affect on limiting the token bucket maximum values.
The ingress rate metering/color table consists of 24 Committed Information Rate (CIR) registers (one
per port/priority), a Committed Burst Size register, and an Excess Burst Size register. All metering/color
table registers are 16-bits in size and are accessed indirectly via the
Command Register
Table 13.15
INGRESS RATE TABLE REGISTERS
below.
Table 13.15 Metering/Color Table Register Descriptions
DESCRIPTION
(SWE_INGRSS_RATE_CMD). Descriptions of these registers are detailed in
DATASHEET
315
Switch Engine Ingress Rate
TYPE
R/W
R/W
R/W
Revision 1.3 (08-27-09)
DEFAULT
0600h
0600h
0014h
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