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KSZ8765CLX-EVAL View Datasheet(PDF) - Micrel

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Micrel, Inc.
KSZ8765CLX
Rate Limiting Support
The KSZ8765CLX provides a fine resolution hardware rate limiting based on both bps (bits per second) and pps (packets
per second).
For bps, the rate step is 64kbps when the rate limit is less than 1Mbps for 100BT or 10BT and 640kbps for 1000. The rate
step is 1Mbps when the rate limit is more than 1Mbps for 100BT or 10BT and 10Mbps for 1000.
For pps, the rate step is 128pps (besides the 1st one which is 64pps) when the rate limit is less than 1Mbps for 100BT or
10BT and 1280pps (except the 1st one of 640pps) for 1000. The rate step is 1Mbps when the rate limit is more than
1.92kpps for 100BT or 10BT 19.2kpps for 1000.
The data rate selection table is below. Note that the pps limiting is bounded by bps rate for each pps setting; the mapping
is shown in the second column of the table.
Table 17. 10/100/1000Mbps Rate Selection for the Rate Limit
Item
bps Bound of pps
(Egress Only)
10Mbps
Code
Code
pps
bps
7’d0
7’d0
19.2kpps
10Mbps
7d’1 to
7d’10
7d’3,6, (8x)10
1.92kpps *
code
1Mbps * code
7d’11 to
7d’100
7d’11 – 7d’100
10Mbps
7d’101
7d’102
64pps
64kbps
7d’102
7d’104
128pps
128kbps
7d’103
7d’108
256pps
192kbps
7d’104
7d’112
384pps
256kbps
7d’105
7d’001
512pps
320kbps
7d’106
7d’001
640pps
384kbps
7d’107
7d’001
768pps
448kbps
7d’108
7d’002
896pps
512kbps
7d’109
7d’002
1024pps
576kbps
7d’110
7d’002
1152pps
640kbps
7d’111
7d’002
1280pps
704kbps
7d’112
7d’002
1408pps
768kbps
7d’113
7d’003
1536pps
832kbps
7d’114
7d’003
1664pps
896kbps
7d’115
7d’003
1792pps
969kbps
100Mbps
pps
192kpps
1.92kpps *
code
1.92kpps *
code
64pps
128pps
256pps
384pps
512pps
640pps
768pps
896pps
1024pps
1152pps
1280pps
1408pps
1536pps
1664pps
1792pps
bps
100Mbps
1Mbps * code
1Mbps * code
64kbps
128kbps
192kbps
256kbps
320kbps
384kbps
448kbps
512kbps
576kbps
640kbps
704kbps
768kbps
832kbps
896kbps
969kbps
1000Mbps
pps
1.92Mpps
19.2kpps *
code
19.2kpps *
code
640pps
1280pps
2560pps
3840pps
5120pps
6400pps
7680pps
8960pps
10240pps
11520pps
12800pps
14080pps
15360pps
16640pps
17920pps
bps
1000Mbps
10Mbps *
code
10Mbps *
code
640kbps
1280kbps
1920kbps
2560kbps
3200kbps
3840kbps
4480kbps
5120kbps
5760kbps
6400kbps
7040kbps
7680kbps
8320kbps
8960kbps
9690kbps
The rate limit operates independently on the “receive side” and on the “transmit side” on a per port basis. For 10BASE-T,
a rate setting above 10Mbps means the rate is not limited.
On the receive side, the data receive rate for each priority at each port can be limited by setting up ingress rate control
registers. On the transmit side, the data transmit rate for each queue at each port can be limited by setting up egress rate
control registers. For bps mode, the size of each frame has options to include minimum inter-frame gap (IFG) or preamble
byte, in addition to the data field (from packet DA to FCS).
July 23, 2014
50
Revision 1.0
 

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