zl50409 Zarlink Semiconductor, zl50409 Datasheet - Page 90

• Manufacturer Part Number: zl50409
• Description: Managed 9-port 10/100m Ethernet Switch
• Manufacturer: Zarlink Semiconductor

12.3.6
12.3.6.1
I²C Address h04B; CPU Address:h500
Accessed by CPU and I
12.3.6.2
I
Accessed by CPU and I
12.3.6.3
I²C Address h069, CPU Address: 511
Accessed by CPU and I²C (R/W)
2
C Address h068, CPU Address: 510
(Group 5 Address) Buffer Control/QOS Group
Bit [0]:
Bit [1]:
Bits [4:2]:
Bit [5]:
Bit [6]:
Bit [7]:
Bits [7:0]:
Bits [7:0]:
QOSC – QOS Control
UCC – Unicast Congestion Control
MCC – Multicast Congestion Control
2
2
C (R/W)
C (R/W)
Number of frame count. Used for best effort dropping at B% when destination
port’s best effort queue reaches UCC threshold and shared pool is all in use.
Granularity is 16 granule (Default 0x6)
In multiples of 16 granules (granularity). Used for triggering MC flow control
when destination port’s multicast best effort queue reaches MCC threshold.
(Default 0x6)
Enable TX rate control (on RMAC ports only)
0 – Disable (Default)
1 – Enable
Enable RX rate control (on RMAC ports only)
0 – Disable (Default)
1 – Enable
Reserved
Select VLAN tag or TOS (IP packets) to be preferentially picked to map
transmit priority and drop priority
0 – Select VLAN Tag priority field over TOS (Default)
1 – Select TOS over VLAN tag priority field
Select TOS bits for Priority
0 – Use TOS [4:2] bits to map the transmit priority (Default)
1 – Use TOS [7:5] bits to map the transmit priority
Select TOS bits for Drop priority
0 – Use TOS [4:2] bits to map the drop priority (Default)
1 – Use TOS [7:5] bits to map the drop priority
Zarlink Semiconductor Inc.
ZL50409
90
Data Sheet