参数资料
型号: ZL50418GKG2
厂商: ZARLINK SEMICONDUCTOR INC
元件分类: 网络接口
英文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA553
封装: 37.50 X 37.50 MM, 2.33 MM HEIGHT, LEAD FREE, MS-034, HSBGA-553
文件页数: 15/155页
文件大小: 1928K
代理商: ZL50418GKG2
ZL50418
Data Sheet
111
Zarlink Semiconductor Inc.
This broadcast and multicast rate defines for each port, the number of packets allowed to be forwarded within a
specified time. Once the packet rate is reached, packets will be dropped. To turn off the rate limit, program the field
to 0. Time base is based on register FCR [6:4]
12.3.6.13
UCC – Unicast Congestion Control
I2C Address h0B6, CPU Address: 50C
Accessed by CPU, serial interface and I2C (R/W)
12.3.6.14
MCC – Multicast Congestion Control
I2C Address h0B7, CPU Address: 50D
Accessed by CPU, serial interface and I2C (R/W)
12.3.6.15
PR100 – Port Reservation for 10/100 ports
I2C Address h0B8, CPU Address 50E
Accessed by CPU, serial interface and I2C (R/W)
Bit [3:0] :
Multicast Rate Control. Number of multicast packets allowed within the time
defined in bits 6 to 4 of the Flooding Control Register (FCR). (Default 0).
Bit [7:4] :
Broadcast Rate Control. Number of broadcast packets allowed within the
time defined in bits 6 to 4 of the Flooding Control Register (FCR).
(Default 0)
70
Unicast congest threshold
Bit [7:0] :
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 1 frame. (Default: h10 for 2 MB/bank or h08 for 1 MB/bank)
75
4
0
FC reaction period
Multicast congest threshold
Bit [4:0]:
In multiples of two frames (granularity). Used for triggering MC flow control
when destination port’s multicast best effort queue reaches MCC
threshold.(Default 0x10)
Bit [7:5]:
Flow control reaction period (Default 2) Granularity 4uSec.
74
3
0
Buffer low threshold
SP Buffer reservation
Bit [3:0]:
Per source port buffer reservation.
Define the space in the FDB reserved for each 10/100 port and CPU.
Expressed in multiples of 4 packets. For each packet 1536 bytes are
reserved in the memory.
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