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參數(shù)資料
| 型號： | KS8995MA |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 24/73頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH 10/100 5PORT 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： | 散裝 |
| 配用： | 576-1017-ND - BOARD EVAL EXPERIMENT KS8995M |
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KS8995MA
Micrel, Inc.
M9999-051305
30
May 2005
Tx Port
Ingress Tag Field
“Tag Insertion”
“Tag Removal”
Egress Action to Tag Field
(0x810+ port mask)
0
Modify tag field to 0x8100.
Recalculate CRC.
No change to TCI if not null VID.
Replace VID with ingress (port 5) port VID if null VID.
(0x810+ port mask)
0
1
(STPID + TCI) will be removed.
Padding to 64 bytes if necessary.
Recalculate CRC.
(0x810+ port mask)
1
0
Modify tag field to 0x8100.
Recalculate CRC.
No change to TCI if not null VID.
Replace VID with ingress (port 5) port VID if null VID.
(0x810+ port mask)
1
Modify tag field to 0x8100.
Recalculate CRC.
No change to TCI if not null VID.
Replace VID with ingress (port 5) port VID if null VID.
Not tagged
Don’t care
Determined by the dynamic MAC address table.
Table 5. STPID Egress Rules (Processor to Switch Port 5)
For packets from regular ports (port 1 - port 4) to port 5, the port mask is used to tell the processor which port the packet was
received on, defined as:
“0001” from port 1,
“0010” from port 2,
“0100” from port 3,
“1000” from port 4
No values other than the previous four defined should be received in this direction in the special mode. Table 6 shows the egress
rule for this direction.
Ingress Packets
Egress Action to Tag Field
Tagged with 0x8100 + TCI
Modify TPID to 0x810 + “port mask,” which indicates source port.
No change to TCI, if VID is not null.
Replace null VID with ingress port VID.
Recalculate CRC.
Not tagged
Insert TPID to 0x810 + “port mask,” which indicates source port.
Insert TCI with ingress port VID.
Recalculate CRC.
Table 6. STPID Egress Rules (Switch to Processor)
IGMP Support
There are two parts involved to support IGMP in Layer 2. The first part is “IGMP” snooping. The switch will trap IGMP packets
and forward them only to the processor port. The IGMP packets are identified as IP packets (either Ethernet IP packets or IEEE
802.3 SNAP IP packets) AND IP version = 0x4 AND protocol number = 0x2. The second part is “multicast address insertion”
in the static MAC table. Once the multicast address is programmed in the static MAC table, the multicast session will be trimmed
to the subscribed ports, instead of broadcasting to all ports. To enable this feature, set Register 5 bit 6 to 1. Also “special tag
mode” needs to be enabled, so that the processor knows which port the IGMP packet was received on. Enable “special tag
mode” by setting both Register 11 bit 0 and Register 80 bit 2.
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相關代理商/技術參數(shù) |
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|---|---|
| KS8995MA_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Integrated 5-Port 10/100 Managed Switch |
| KS8995MA-EVAL | 功能描述:BOARD EVAL EXPERIMENT KS8995MA RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產零件編號 系列:- 標準包裝:1 系列:- 類型:MCU 適用于相關產品: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 |
| KS8995MAI | 功能描述:IC SWITCH 10/100 5PORT 128PQFP RoHS:否 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(shù)據(jù)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 |
| KS8995MAL | 功能描述:IC SWITCH 10/100 5PORT 128PQFP RoHS:否 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(shù)據(jù)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 |
| KS8995M-EVAL | 功能描述:BOARD EVAL EXPERIMENT KS8995M RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝: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 |
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