Datasheet
2016 Microchip Technology Inc. DS00002246A-page 71
KSZ8895MQX/RQX/FQX/MLX
6 - 0
Port Transmit
Queue 1
Ratio[6:0]
Packet number for Transmit Queue 1 for low/
high priority packets in four queues mode and
high priority packets in two queues mode
R/W 0000010
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
7
Enable Port
Transmit Queue
0 Rate
0, strict priority, will transmit all the packets from
this priority queue 0 before transmit lower prior-
ity queue.
1, bit [6:0] reflect the packet number allow to
transmit from this priority queue 0 within a cer-
tain time
R/W 1
6 - 0
Port Transmit
Queue 0
Ratio[6:0]
Packet number for Transmit Queue 0 for lowest
priority packets in four queues mode and low
priority packets in two queues mode
R/W 0000001
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 Reserved — RO 000
4
Ingress Rate
Limit Flow Con-
trol Enable
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
R/W 0
3 - 2 Limit Mode
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
R/W 00
1 Count IFG
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.
R/W 0
0 Count Pre
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.
R/W 0
Register 183 (0xB7): Port 1 Priority 0 Ingress Limit Control 1
Register 199 (0xC7): Port 2 Priority 0 Ingress Limit Control 1
Register 215 (0xD7): Port 3 Priority 0 Ingress Limit Control 1
Register 231 (0xE7): Port 4 Priority 0 Ingress Limit Control 1
Register 247 (0xF7): Port 5 Priority 0 Ingress Limit Control 1
7 Reserved — RO 0
TABLE 4-4: ADVANCED CONTROL REGISTER DESCRIPTIONS (CONTINUED)
Address Name Description Mode Default