参数资料
| 型号： | KS8993F |
| 厂商： | Micrel Inc |
| 文件页数： | 35/99页 |
| 文件大小： | 0K |
| 描述： | IC CONV MED 10/100 3PORT 128PQFP |
| 标准包装： | 66 |
| 系列： | * |
| 类型： | * |
| 应用： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 128-BFQFP |
| 供应商设备封装： | 128-PQFP（14x20） |
| 配用： | KS8993F-EVAL-ND - EVAL KIT EXPERIMENTAL KS8993F |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页当前第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页
KS8993F
Micrel
August 26, 2004
Revision 1.0
- 40 -
1.
“Transmit all high priority packets before low priority packets”, i.e. a low priority packet could be transmitted
only when the high priority queue is empty;
2.
“Transmit high priority packets and low priority packets at 10:1 ratio”, i.e. transmit a low priority packet after
every 10 high priority packets are transmitted, if both queues are busy;
3.
“Transmit high priority packets and low priority packets at 5:1 ratio”;
4.
“Transmit high priority packets and low priority packets at 2:1 ratio”.
If a port's transmit queue is not split, both high priority packets and low priority packets have equal priority in the
transmit queue. Register 5 bits [3:2] are used to select the desired priority scheme. Optionally, the PRSEL1 and
PRSEL0 strap-in pins can be used.
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 KS8993F 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.
Figure 6: 802.1p Priority Field Format
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
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 KS8993F 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
相关PDF资料 |
PDF描述 |
|---|---|
| LFXP15E-5F256C | IC FPGA 15.4KLUTS 188I/O 256-BGA |
| LFXP15E-4F256I | IC FPGA 15.4KLUTS 188I/O 256-BGA |
| LFXP15C-5F256C | IC FPGA 15.5KLUTS 188I/O 256-BGA |
| LFXP15C-4F256I | IC FPGA 15.5KLUTS 188I/O 256-BGA |
| LFXP15E-4FN256I | IC FPGA 15.4KLUTS 256FPBGA |
相关代理商/技术参数 |
参数描述 |
|---|---|
| KS8993F-A1 | 功能描述:IC CONV MED 10/100 3PORT 128PQFP RoHS:否 类别:集成电路 (IC) >> 专用 IC 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:调帧器 应用:数据传输 安装类型:表面贴装 封装/外壳:400-BBGA 供应商设备封装:400-PBGA（27x27） 包装:散装 |
| KS8993FA5 | 功能描述:IC SWITCH 3-PORT 10/100 128-PQFP RoHS:否 类别:集成电路 (IC) >> 专用 IC 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:调帧器 应用:数据传输 安装类型:表面贴装 封装/外壳:400-BBGA 供应商设备封装:400-PBGA（27x27） 包装:散装 |
| KS8993F-EVAL | 功能描述:EVAL KIT EXPERIMENTAL KS8993F RoHS:否 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板 |
| KS8993FL | 功能描述:IC CONV MED 10/100 SGL 128PQFP RoHS:否 类别:集成电路 (IC) >> 专用 IC 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:调帧器 应用:数据传输 安装类型:表面贴装 封装/外壳:400-BBGA 供应商设备封装:400-PBGA（27x27） 包装:散装 |
| KS8993FL-EVAL | 功能描述:BOARD EVAL EXPERIMENT KS8993F RoHS:否 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板 |
发布紧急采购，3分钟左右您将得到回复。