KSZ8895MQ_12 MICREL [Micrel Semiconductor], KSZ8895MQ_12 Datasheet - Page 83

• Manufacturer Part Number: KSZ8895MQ_12
• Description: Integrated 5-Port 10/100 Managed Ethernet Switch with MII/RMII interface
• Manufacturer: MICREL [Micrel Semiconductor]

Micrel, Inc.
Advanced Control Registers (Continued)
March 2012
Address
Register 181 (0xB5): Port 1 Control 13
Register 197 (0xC5): Port 2 Control 13
Register 213 (0xD5): Port 3 Control 13
Register 229 (0xE5): Port 4 Control 13
Register 245 (0xF5): Port 5 Control 13
6 – 0
Register 182 (0xB6): Port 1 Rate Limit Control
Register 198 (0xC6): Port 2 Rate Limit Control
Register 214 (0xD6): Port 3 Rate Limit Control
Register 230 (0xE6): Port 4 Rate Limit Control
Register 246 (0xF6): Port 5 Rate Limit Control
7 – 5
4
3 – 2
1
0
7
Name
Enable Port Transmit Queue 0
Rate
Port Transmit Queue 0
Ratio[6:0]
Reserved
Ingress Rate Limit Flow
Control Enable
Limit Mode
Count IFG
Count Pre
Description
0, strict priority, will transmit all the packets from
this priority queue 0 before transmit lower priority
queue.
1, bit[6:0] reflect the packet number allow to
transmit from this priority queue 0 within a certain
time.
packet number for Transmit Queue 0 for lowest
priority packets in four queues mode and low
priority packets in two queues mode.
1 = Flow Control is asserted if the port’s receive
rate is exceeded.
0 = Flow Control is not asserted if the port’s receive
rate is exceeded.
Ingress Limit Mode
These bits determine what kinds of frames are
limited and counted against ingress rate limiting.
= 00, limit and count all frames.
= 01, limit and count Broadcast, Multicast, and
flooded unicast frames.
= 10, limit and count Broadcast and Multicast
frames only.
= 11, limit and count Broadcast frames only.
Count IFG bytes
= 1, each frame’s minimum inter frame gap.
(IFG) bytes (12 per frame) are included in Ingress
and Egress rate limiting calculations.
= 0, IFG bytes are not counted.
Count Preamble bytes
= 1, each frame’s preamble bytes (8 per
frame) are included in Ingress and Egress rate
limiting calculations.
= 0, preamble bytes are not counted.
83
Mode
KSZ8895MQ/RQ/FMQ
R/W
R/W
R/W
R/W
R/W
R/W
RO
M9999-032612-1.5
0000001
Default
000
00
1
0
0
0