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| 型号： | KSZ8842-PMQL-EVAL |
| 厂商： | Micrel Inc |
| 文件页数： | 44/119页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION KSZ8842-PMQL |
| 标准包装： | 1 |
| 主要目的： | 接口，以太网控制器（PHY 和 MAC） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | KSZ8842-PMQL |
| 主要属性： | 2 个端口，100BASE-TX/10BASE-T |
| 次要属性： | 8/16 位接口，LinkMD 线缆诊断 |
| 已供物品： | 板 |
| 产品目录页面： | 1114 (CN2011-ZH PDF) |
| 相关产品： | 576-3348-ND - IC ETHERNET SW 2PORT 100-LFBGA 576-3089-ND - IC ETHERNT SW 2PORT PCI 100LFBGA 576-2121-ND - IC ETHERNET SW 2PORT PCI 128PQFP 576-1513-5-ND - IC SWITCH 10/100 32BIT 128-PQFP |
| 其它名称： | 576-1636 |
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Micrel, Inc.
KSZ8842-PMQL/PMBL
October 2007
30
M9999-100207-1.5
forwarded.
Learning is
disabled.
specific packets to the processor. The processor may send
packets to the port(s) in this state. Address learning is disabled on
the port in this state.
Learning State
Port Setting
Software Action
Only packets to
and from the
processor are
forwarded.
Learning is
enabled.
“transmit enable = 0,
receive enable = 0,
learning disable = 0”
The processor should program the “Static MAC table” with the
entries that it needs to receive (for example, BPDU packets). The
“overriding” bit should be set so that the switch will forward those
specific packets to the processor. The processor may send
packets to the port(s) in this state. Address learning is enabled on
the port in this state.
Forwarding
State
Port Setting
Software Action
Packets are
forwarded and
received normally.
Learning is
enabled.
“transmit enable = 1,
receive enable = 1,
learning disable = 0”
The processor programs the “Static MAC table” with the entries
that it needs to receive (for example, BPDU packets). The
“overriding” bit is set so that the switch forwards those specific
packets to the processor. The processor can send packets to the
port(s) in this state. Address learning is enabled on the port in this
state.
Table 4. KSZ8841-PMQL/PMBL EEPROM Format
IGMP Support
For Internet Group Management Protocol (IGMP) support in Layer 2, the KSZ8842-PMQL/PMBL provides two
components:
“IGMP” Snooping
The KSZ8842-PMQL/PMBL traps IGMP packets and forwards them only to the processor (host port). The IGMP
packets are identified as IP packets (either Ethernet IP packets, or IEEE 802.3 SNAP IP packets) with IP version = 0x4
and protocol version number = 0x2.
“Multicast Address Insertion” in the Static MAC Table
Once the multicast address is programmed in the Static MAC Table, the multicast session is trimmed to the subscribed
ports, instead of broadcasting to all ports.
IPv6 MLD Snooping
The KSZ8842-PMQL/PMBL traps IPv6 Multicast Listener Discovery (MLD) packets and forwards them only to the
processor (host port). MLD snooping is controlled by SGCR2[13] (MLD snooping enable) and SGCR2[12] (MLD option).
Setting SGCR2[13] causes the KSZ8842-PMQL/PMBL to trap packets that meet all of the following conditions:
IPv6 multicast packets
Hop count limit = 1
IPv6 next header = 1 or 58 (or = 0 with hop-by-hop next header = 1 or 58)
If SGCR2[12] =1, IPv6 next header = 43, 44, 50, 51, or 60 (or =0 with hop-by-hop next header = 43, 44, 50, 51,
or 60)
Port Mirroring Support
KSZ8842-PMQL/PMBL supports “Port Mirroring” comprehensively as:
“receive only” mirror on a port
All the packets received on the port are mirrored on the sniffer port. For example, port 1 is programmed to be “receive
sniff” and the host port is programmed to be the “sniffer port”. A packet received on port 1 is destined to port 2 after the
internal lookup. The KSZ8842-PMQL/PMBL forwards the packet to both port 2 and the host port. The KSZ8842-
PMQL/PMBL can optionally even forward “bad” received packets to the “sniffer port”.
“transmit only” mirror on a port
All the packets transmitted on the port are mirrored on the sniffer port. For example, port 1 is programmed to be
“transmit sniff” and the host port is programmed to be the “sniffer port”. A packet received on port 2 is destined to port 1
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