参数资料
型号: KSZ8842-16MQL-EVAL
厂商: Micrel Inc
文件页数: 83/141页
文件大小: 0K
描述: BOARD EVALUATION KSZ8842-16MQL
标准包装: 1
主要目的: 接口,以太网控制器(PHY 和 MAC)
嵌入式:
已用 IC / 零件: KSZ8842-16MQL
主要属性: 2 个端口,100BASE-TX/10BASE-T,管理型
次要属性: 8/16 位接口,LinkMD 线缆诊断
已供物品: 板,CD,文档,电源
产品目录页面: 1114 (CN2011-ZH PDF)
相关产品: 576-3076-ND - IC MAC CTLR 2PORT ETH 100-LFBGA
KSZ8842-32MQLA6-ND - IC SWITCH 10/100 32BIT 128PQFP
576-1479-ND - IC SWITCH 10/100 32BIT 128PQFP
576-1478-5-ND - IC SWITCH 10/100 16BIT 128PQFP
其它名称: 576-1634
Micrel, Inc.
KSZ8842-16/32 MQL/MVL/MVLI/MBL
October 2007
46
M9999-102207-1.9
DA found in
Static MAC
Table?
Use FID flag?
FID match?
DA+FID found in
Dynamic MAC
Table?
Action
No
Don’t care
No
Broadcast to the membership ports
defined in the VLAN Table bits [18:16]
No
Don’t care
Yes
Send to the destination port defined in the
Dynamic MAC Address Table bits [53:52]
Yes
0
Don’t care
Send to the destination port(s) defined in
the Static MAC Address Table bits [50:48]
Yes
1
No
Broadcast to the membership ports
defined in the VLAN Table bits [18:16]
Yes
1
No
Yes
Send to the destination port defined in the
Dynamic MAC Address Table bits [53:52]
Yes
1
Yes
Don’t care
Send to the destination port(s) defined in
the Static MAC Address Table bits [50:48]
Table 10. FID+DA Lookup in VLAN Mode
FID+SA found in Dynamic
MAC Table?
Action
No
Learn and add FID+SA to the Dynamic MAC Address Table
Yes
Update time stamp
Table 11. FID+SA Lookup in VLAN Mode
QoS Priority Support
The KSZ8842M provides Quality of Service (QoS) for applications such as VoIP and video conferencing. Offering four
priority queues per port, the per-port transmit queue can be split into four priority queues: Queue 3 is the highest priority
queue and Queue 0 is the lowest priority queue. Bit 0 of registers P1CR1, P2CR1, and P3CR1 is used to enable split
transmit queues for ports 1, 2, and the host port, respectively.
Port-Based Priority
With port-based priority, each ingress port is individually classified as a high-priority receiving port. All packets received at
the high-priority receiving port are marked as high priority and are sent to the high-priority transmit queue if the
corresponding transmit queue is split. Bit 4 and 3 of registers P1CR1, P2CR1, and P3CR1 is used to enable port-based
priority for ports 1, 2, and the host port, respectively.
802.1p-Based Priority
For 802.1p-based priority, the KSZ8842M examines the ingress (incoming) packets to determine whether they are tagged.
If tagged, the 3-bit priority field in the VLAN tag is retrieved and compared against the “priority mapping” value, as
specified by the register SGCR6. The “priority mapping” value is programmable.
Figure 14 illustrates how the 802.1p priority field is embedded in the 802.1Q VLAN tag.
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