參數(shù)資料
型號： KSZ8895MQ-EVAL
廠商： Micrel Inc
文件頁數(shù)： 47/119頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR KSZ8895MQ
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，以太網(wǎng)控制器（PHY 和 MAC）
嵌入式： 否
已用 IC / 零件： KSZ8895MQ
已供物品： 板
相關(guān)產(chǎn)品： 576-3753-ND - IC ETHERNET SW 5PORT 128-PQFP
其它名稱： 576-3871
Micrel, Inc.
KSZ8895MQ/RQ/FMQ
Functional Overview: Switch Core
Address Look-Up
The internal look-up table stores MAC addresses and their associated information. It contains a 1K unicast address
table plus switching information. The KSZ8895MQ/RQ/FMQ is guaranteed to learn 1K addresses and distinguishes
itself from a hash-based look-up table, which, depending on the operating environment and probabilities, may not
guarantee the absolute number of addresses it can learn.
Learning
The internal look-up engine updates its table with a new entry if the following conditions are met:
The received packet’s source address (SA) does not exist in the look-up table.
The received packet is good; the packet has no receiving errors and is of legal length.
The look-up engine inserts the qualified SA into the table, along with the port number and time stamp. If the table is
full, the last entry of the table is deleted first to make room for the new entry.
Migration
The internal look-up engine also monitors whether a station is moved. If this occurs, it updates the table accordingly.
Migration happens when the following conditions are met:
The received packet’s SA is in the table but the associated source port information is different.
The received packet is good; the packet has no receiving errors and is of legal length.
The look-up engine will update the existing record in the table with the new source port information.
Aging
The look-up engine will update the time stamp information of a record whenever the corresponding SA appears. The
time stamp is used in the aging process. If a record is not updated for a period of time, the look-up engine will
remove the record from the table. The look-up engine constantly performs the aging process and will continuously
remove aging records. The aging period is 300 +/- 75 seconds. This feature can be enabled or disabled through
Register 3 or by external pull-up or pull-down resistors on LED[5][2]. See “Register 3” section.
Forwarding
The KSZ8895MQ/RQ/FMQ will forward packets using an algorithm that is depicted in the following flowcharts. Figure
6 shows stage one of the forwarding algorithm where the search engine looks up the VLAN ID, static table, and
dynamic table for the destination address, and comes up with “port to forward 1” (PTF1). PTF1 is then further
modified by the spanning tree, IGMP snooping, port mirroring, and port VLAN processes to come up with “port to
forward 2” (PTF2), as shown in Figure 7. This is where the packet will be sent.
KSZ8895MQ/RQ/FMQ will not forward the following packets:
Error packets. These include framing errors, FCS errors, alignment errors, and illegal size packet errors.
802.3x pause frames. The KSZ8895MQ/RQ/FMQ will intercept these packets and perform the appropriate
actions.
“Local” packets. Based on destination address (DA) look-up. If the destination port from the look-up table
matches the port where the packet was from, the packet is defined as “l(fā)ocal.”
Switching Engine
The KSZ8895MQ/RQ/FMQ features a high-performance switching engine to move data to and from the MAC’s
packet buffers. It operates in store and forward mode, while the efficient switching mechanism reduces overall
latency. The KSZ8895MQ/RQ/FMQ has a 64kB internal frame buffer. This resource is shared between all five ports.
There are a total of 512 buffers available. Each buffer is sized at 128B.
Media Access Controller (MAC) Operation
The KSZ8895MQ/RQ/FMQ strictly abides by IEEE 802.3 standards to maximize compatibility.
March 12, 2014
33
Revision 1.7
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