參數資料
| 型號： | KSZ8993M |
| 廠商： | Micrel Inc |
| 文件頁數： | 19/85頁 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 10/100 3PORT 128PQFP |
| 標準包裝： | 66 |
| 系列： | * |
| 類型： | * |
| 應用： | * |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 128-BFQFP |
| 供應商設備封裝： | 128-PQFP（14x20） |
| 包裝： | 托盤 |
| 產品目錄頁面： | 1081 (CN2011-ZH PDF) |
| 其它名稱： | 576-1037 |
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Micrel, Inc.
KS8993M/ML/MI
April 2005
26
M9999-041205
Functional Overview: MAC and Switch
Address Lookup
The internal lookup table stores MAC addresses and their associated information. It contains a 1K uni-cast
address table plus switching information. The KS8993M is guaranteed to learn 1K addresses and distinguishes
itself from hash-based lookup tables, which depending on the operating environment and probabilities, may not
guarantee the absolute number of addresses that can be learned.
Learning
The internal lookup engine will update its table with a new entry if the following conditions are met:
1.
The received packet's SA does not exist in the lookup table.
2.
The received packet is good; the packet has no receiving errors, and is of legal length.
The lookup engine will insert 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 will be deleted to make room for the new entry.
Migration
The internal lookup engine also monitors whether a station has moved. If so, it will update the table accordingly.
Migration happens when the following conditions are met:
1.
The received packet's SA is in the table but the associated source port information is different.
2.
The received packet is good; the packet has no receiving errors, and is of legal length.
The lookup engine will update the existing record in the table with the new source port information.
Aging
The lookup 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 lookup engine will
remove the record from the table. The lookup engine constantly performs the aging process and will continuously
remove aging records. The aging period is about 200 seconds. This feature can be enabled or disabled through
Global Register 3 (0x03).
Forwarding
The KS8993M will forward packets using the algorithm that is depicted in the following flowcharts. Figure 4 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
spanning tree, IGMP snooping, port mirroring, and port VLA processes to come up with “port to forward 2”
(PTF2), as shown in Figure 5. The packet is sent to PTF2.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| KSZ8993MA5 | 功能描述:IC SWITCH 10/100 W/TXRX 128PQFP RoHS:是 類別:集成電路 (IC) >> 專用 IC 系列:* 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:調幀器 應用:數據傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應商設備封裝:400-PBGA（27x27） 包裝:散裝 |
| KSZ8993M-EVAL | 功能描述:以太網開發(fā)工具 KSZ8993M Evaluation Board RoHS:否 制造商:Micrel 產品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| KSZ8993MI | 功能描述:以太網 IC 2+1 Port 10/100 Switch w/Tranceivers & Frame Buffers, 128-Ld PQFP (Lead Free) RoHS:否 制造商:Micrel 產品:Ethernet Switches 收發(fā)器數量:2 數據速率: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 |
| KSZ8993ML | 功能描述:以太網 IC 2+1 Port 10/100 Switch w/Tranceivers & Frame Buffers, 128-Ld PQFP(Lead Free) RoHS:否 制造商:Micrel 產品:Ethernet Switches 收發(fā)器數量:2 數據速率: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 |
| KSZ8993ML-EVAL | 功能描述:以太網開發(fā)工具 KSZ8993ML Evaluation Board RoHS:否 制造商:Micrel 產品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
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