- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄4571 > KS8993M (Micrel Inc)IC SWITCH 10/100 3PORT 128PQFP PDF資料下載
參數(shù)資料
| 型號： | KS8993M |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 31/85頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH 10/100 3PORT 128PQFP |
| 標準包裝： | 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： | 管件 |
| 配用： | 576-1013-ND - BOARD EVAL EXPERIMENT KS8993M |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁當前第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁
Micrel, Inc.
KS8993M/ML/MI
April 2005
37
M9999-041205
Port-Based Priority
With port based priority, each ingress port can be individually classified as a high priority receiving port. All
packets received at the high priority receiving port are marked as high priority, and will be sent to the high priority
transmit queue if the corresponding transmit queue is split. Bit 4 of registers 16, 32 and 48 is used to enable port
based priority for ports 1, 2 and 3, respectively. Optionally, the Px_PP strap-in pins can be used to enable this
feature.
802.1p-Based Priority
For 802.1p based priority, the KS8993M will examine the ingress (incoming) packets to determine whether they
are tagged. If tagged, the 3-bits priority field in the VLAN tag is retrieved and compared against the “priority base”
value, specified by register 2 bits [6:4]. The “priority base” value is programmable; its default value is 0x4.
The following figure illustrates how the 802.1p priority field is embedded in the 802.1Q VLAN tag.
Preamble
DA
TCI
86
6
2
length
LLC
Data
FCS
2
46-1500
4
1
Tagged Packet Type
(8100 for Ethernet)
802.1p
CF
I
VLAN ID
Bytes
Bits
16
3
12
802.1q VLAN Tag
2
SA
VPID
Figure 6. 802.1p Priority Field Format
If an ingress packet has an equal or higher priority value than the "priority base" value, the packet will be placed in
the high priority transmit queue if the corresponding transmit queue is split. 802.1p based priority is enabled by bit
5 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively. Optionally, the Px_1PEN strap-in pins can be used
to enable this feature.
The KS8993M provides the option to insert or remove the priority tagged frame's header at each individual egress
port. This header, consisting of the 2 bytes VLAN Protocol ID (VPID) and the 2 bytes Tag Control Information field
(TCI), is also refer to as the 802.1Q VLAN Tag.
Tag Insertion is enabled by bit 2 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively. Optionally, the
Px_TAGINS strap-in pins can be used to enable this feature. At the egress port, untagged packets are tagged
with the ingress port’s default tag. The default tags are programmed in register sets {19,20}, {35,36} and {51,52}
for ports 1, 2 and 3, respectively. The KS8993M will not add tags to already tagged packets.
Tag Removal is enabled by bit 1 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively. Optionally, the
Px_TAGRM strap-in pins can be used to enable this feature. At the egress port, tagged packets will have their
802.1Q VLAN Tags removed. The KS8993M will not modify untagged packets.
The CRC is recalculated for both tag insertion and tag removal.
802.1p Priority Field Re-mapping is a QoS feature that allows the KS8993M to set the “User Priority Ceiling” at
any ingress port. If the ingress packet’s priority field has a higher priority value than the default tag’s priority field
of the ingress port, the packet’s priority field is replaced with the default tag’s priority field. The “User Priority
Ceiling” is enabled by bit 3 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively.
DiffServ-Based Priority
DiffServ-based priority uses registers 96 to 103. More details are provided at the beginning of the Advanced
Control Registers section.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ESA49DTAH | CONN EDGECARD 98POS R/A .125 SLD |
| EMA49DTAH | CONN EDGECARD 98POS R/A .125 SLD |
| LFXP20E-4F388C | IC FPGA 19.7KLUTS 268I/O 388-BGA |
| ESA49DTAD | CONN EDGECARD 98POS R/A .125 SLD |
| EMA49DTAD | CONN EDGECARD 98POS R/A .125 SLD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KS8993M_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Integrated 3-Port 10/100 Managed Switch with PHYs |
| KS8993MA5 | 功能描述:IC SWITCH 3-PORT 10/100 128-PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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 |
| KS8993M-EVAL | 功能描述:BOARD EVAL EXPERIMENT KS8993M RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 產(chǎn)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 |
| KS8993MI | 功能描述:IC SWITCH 10/100 3PORT 128PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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 |
| KS8993ML | 功能描述:IC SWITCH 10/100 3PORT 128PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。