參數(shù)資料
型號(hào)： KS8995XA
廠商： Micrel Inc
文件頁(yè)數(shù)： 14/51頁(yè)
文件大?。?/td> 0K
描述： IC SWITCH 10/100 5PORT 128PQFP
標(biāo)準(zhǔn)包裝： 66
系列： *
類型： *
應(yīng)用： *
安裝類型： 表面貼裝
封裝/外殼： 128-BFQFP
供應(yīng)商設(shè)備封裝： 128-PQFP（14x20）
包裝： 散裝
配用： 576-1604-ND - EVAL KIT EXPERIMENTAL KS8995XA
May 2005
21
M9999-051305
KS8995XA
Micrel, Inc.
Start Auto
Negotiation
Force Link Setting
Listen for 10BaseT
Link Pulses
Listen for
100BaseTX Idles
Attempt
Auto-Negotiation
Link Mode Set
Bypass
Auto-Negotiation
and Set Link Mode
Link Mode Set ?
Parallel
Operation
Join Flow
No
Yes
No
Figure 4. Auto-Negotiation
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 KS8995XA is guaranteed to learn 1K addresses and distinguishes itself from hash-based look-up
tables 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 will update 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 will insert the qualified SA into the table, along with the port number, time stamp. If the table is full, the
last entry of the table will be deleted first to make room for the new entry.
Migration
The internal look-up engine also monitors whether a station is moved. If it happens, it will update 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.
Switching Engine
The KS8995XA 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 KS8995XA has a 64kB internal frame buffer. This resource is shared between all five ports. The buffer sharing mode can
be programmed through Register 2. See “Register 2.” In one mode, ports are allowed to use any free buffers in the buffer pool.
In the second mode, each port is only allowed to use 1/5 of the total buffer pool. There are a total of 512 buffers available. Each
buffer is sized at 128B.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
KS8995XA_11 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Integrated 5-Port 10/100 QoS Switch
KS8995XA4 功能描述:IC SWITCH 5-PORT 10/100 128-PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝
KS8995XAB3 功能描述:IC SWITCH 5-PORT 10/100 128-PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝
KS8995XA-EVAL 功能描述:EVAL KIT EXPERIMENTAL KS8995XA RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板
KS8995XC 制造商:RF Micro Devices Inc 功能描述:
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