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參數(shù)資料
| 型號(hào)： | KS8993ML |
| 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(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： | 576-1016-ND - BOARD EVAL FOR KS8993ML |
| 其它名稱： | 576-1015 |
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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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| KS8993ML-EVAL | 功能描述:BOARD EVAL FOR KS8993ML 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(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 |
| KS8995 | 制造商:KENDIN 功能描述:KS8995 制造商:Micrel Inc 功能描述:SPECIAL FUNCTION IC, Silicon Manufacturer:Micrel Semiconductor, Silicon Core Num |
| KS8995E | 制造商:Micrel Inc 功能描述: |
| KS8995E-EVAL | 功能描述:BOARD EVAL EXPERIMENT KS8995E 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(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 |
| KS8995FQ | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Integrated 5-Port 10/100 Managed Switch |
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