参数资料
型号: ZL50408GDG2
厂商: CONEXANT SYSTEMS
元件分类: 网络接口
英文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA208
封装: 17 X 17 MM, 1.40 MM HEIGHT, LEAD FREE, MO-192, LBGA-208
文件页数: 138/144页
文件大小: 1779K
代理商: ZL50408GDG2
ZL50408
Data Sheet
93
Zarlink Semiconductor Inc.
12.3.4.21
CPUGRNCTR – CPU Granule Control
CPU Address: h033f
Accessed by CPU, (R/W)
CPU receive queue status
12.3.5
(Group 4 Address) Search Engine Group
12.3.5.1
AGETIME_LOW – MAC address aging time Low
IC Address: h049; CPU Address: h0400
Accessed by CPU and IC (R/W)
Used in conjuction with AGETIME_HIGH. The ZL50408 removes the MAC address from the data base and sends a
Delete MAC Address Control Command to the CPU.
12.3.5.2
AGETIME_HIGH –MAC address aging time High
IC Address: h04A; CPU Address: h0401
Accessed by CPU and IC (R/W)
The default setting of AGETIME_LOW/HIGH provides 300 seconds aging time. Aging time is based on the
following equation:
{AGETIME_HIGH,AGETIME_LOW} X (# of MAC entries in the memory X 800 sec). Number of MAC entries = 4 K.
12.3.5.3
SE_OPMODE – Search Engine Operation Mode
CPU Address: h0403
Accessed by CPU (R/W)
Note:
ECR2[2] enable/disable learning for each port.
Bit [0]:
Allocate granule to the CPU if set to one. Otherwise, do not allocate any resource.
Bit [1]:
Read allocated granule (at rising edge only)
Bit [2]:
Release info valid (will be processed at rising edge only)
Bits [7:0]:
Low byte of the MAC address aging timer (Default 0x5C)
Bits [7:0]:
High byte of the MAC address aging timer (Default 0x00)
Bit [0]:
Reserved. Must be 0.
Bit [1]:
Protocol filtering mode
0 – Inclusive (Default)
1 – Exclusive
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