KSZ9563RNXC datasheet(172/226 Pages) MICROCHIP

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KSZ9563R

DS00002419D-page 172

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5.2.8.3

Port Transmit Queue Control 0 Register

This register is indexed. Settings are applied on a per-queue and per-port basis. Specify the target queue number in the

Port Transmit Queue Index Register before accessing this register.

5.2.8.4

Port Transmit Queue Control 1 Register

This register is indexed. Settings are applied on a per-queue and per-port basis. Specify the target queue number in the

Port Transmit Queue Index Register before accessing this register.

Address:

0xN914

Port N: 1-3

Size:

8 bits

Bits

Description

Type

Default

7:6

Scheduler Mode

Determines the egress scheduling policy when 2 or 4 transmit queues are

enabled.

00 = Strict Priority. All packets in queue 3 are transmitted before any packets

from any lower number queue will be transmitted. All packets in queue 2 are

transmitted before any packets from any lower number queue, etc..

10 = Weighted Round Robin (WRR). As determined by the weight values in

the (queue indexed) Port Transmit Queue Control 1 Register, a limited num-

ber of packets are transmitted from a queue before the next queue is serviced.

All queues are serviced in turn.

01 and 11 = RESERVED

R/W

10b

5:4

Shaper Mode

Determines the egress traffic shaper used.

00 = No shaping.

01 = Credit based shaper (CBS) as defined in IEEE 802.1Qav for AVB

10 = RESERVED

11 = RESERVED

R/W

00b

3:0

RESERVED

0000b

Address:

0xN915

Port N: 1-3

Size:

8 bits

Bits

Description

Type

Default

RESERVED

6:0

Queue Weight for WRR Scheduling

During weighted round robin (WRR) scheduling, this value specifies the num-

ber of packets that may be transmitted from the particular queue before the

next queue is serviced. These values are not relevant when the port is config-

ured for a single egress queue. Do not assign 0 to any queue.

Example values for a 4-queue configuration are 8 (for queue 3), 4 (for queue

2), 2 (for queue1) and 1 (for queue 0).

R/W

0000001

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