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參數(shù)資料
| 型號： | KSZ8995XA |
| 廠商： | MICREL INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | Integrated 5-Port 10/100 QoS Switch |
| 中文描述： | DATACOM, LAN SWITCHING CIRCUIT, PQFP128 |
| 封裝： | LEAD FREE, PLASTIC, QFP-128 |
| 文件頁數(shù)： | 21/51頁 |
| 文件大?。?/td> | 305K |
| 代理商： | KSZ8995XA |
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May 2005
21
M9999-051305
KS8995XA
Micrel, Inc.
Start Auto
Force Link Setting
ListLink Pulses
100Listen for
AutAttempt
Link Mode Set
AutoBypass
Link Mode Set
Parallel
Join Flow
No
Yes
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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| KSZ8995XA4 | 功能描述:IC SWITCH 5-PORT 10/100 128PQFP RoHS:是 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 |
| KSZ8995XAB3 | 功能描述:IC SWITCH 5-PORT 10/100 128PQFP RoHS:是 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 |
| KSZ8995XA-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 KSZ8995XA Evaluation Board RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| KSZ8995X-EVAL | 功能描述:BOARD EVALUATION FOR KSZ8995X RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:MCU 適用于相關(guān)產(chǎn)品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、纜線、軟件、數(shù)據(jù)表和用戶手冊 其它名稱:520-1035 |
| KSZ8997 | 功能描述:以太網(wǎng) IC 8 Port 10/100 Switch with PHY and Frame Buffers (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
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