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參數(shù)資料
| 型號： | KS8995XA |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 18/51頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH 10/100 5PORT 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： | 576-1604-ND - EVAL KIT EXPERIMENTAL KS8995XA |
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May 2005
25
M9999-051305
KS8995XA
Micrel, Inc.
SNI Interface Operation
The serial network interface (SNI) is compatible with some controllers used for network layer protocol processing. This interface
can be directly connected to these types of devices. The signals are divided into two groups, one for transmission and the other
for reception. The signals involved are described in the table below.
SNI Signal
Description
KS8995XA Signal
TXEN
Transmit Enable
SMTXEN
TXD
Serial Transmit Data
SMTXD[0]
TXC
Transmit Clock
SMTXC
COL
Collision Detection
SCOL
CRS
Carrier Sense
SMRXDV
RXD
Serial Receive Data
SMRXD[0]
RXC
Receive Clock
SMRXC
Table 3. SNI Signals
This interface is a bit-wide data interface and therefore runs at the network bit rate (not encoded). An additional signal on the
transmit side indicates when data is valid. Likewise, the receive side has an indicator that conveys when the data is valid.
For half-duplex operation there is a signal that indicates a collision has occurred during transmission.
Advanced Functionality
QoS Support
The KS8995XA is a QoS switch, meaning that is it able to identify selected packets on its ingress ports, prioritize them, and
service the packets according to their priority on the egress ports. In this way, the KS8995XA can provide statistically better
service to the high priority packets that are latency sensitive, or require higher bandwidth. The KS8995XA supports ingress
QoS classification using three different mechanisms: port-based priority, 802.1p tag-based priority, and DSCP priority for IPv4
packets.
Port-based priority is useful when the user wants to give a device on a given port high priority. For example in Figure 7, port
1 is given high priority because it is connected to an IP phone and port 4 is given lower priority because it is connected to a
computer whose data traffic may be less sensitive to network congestion. Each port on the KS8995XA can be set as high or
low priority with an EEPROM. The port priority is set in bit 4 of registers 0x10, 0x20, 0x30, 0x40, 0x50 for ports 1, 2, 3, 4 and
5, respectively. Port-based priority is overridden by the OR’ed result of the 802.1p and DSCP priorities if they are all enabled
at the same time.
P3
P4
Low
4[3
P
ri
o
P
P1[3]=1
High Priority Port
WAN
Router
8995XA
P5
P1
P2
P5[0]=1, Hi/Lo Tx Priority
Queues enabled
Hi-Pri
Queue
Lo-Pri
Queue
]=0
rio ty
rt
IP Phone
Figure 7. Port-Based Priority
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KS8995XA_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Integrated 5-Port 10/100 QoS Switch |
| KS8995XA4 | 功能描述:IC SWITCH 5-PORT 10/100 128-PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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 |
| KS8995XAB3 | 功能描述:IC SWITCH 5-PORT 10/100 128-PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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 |
| KS8995XA-EVAL | 功能描述:EVAL KIT EXPERIMENTAL KS8995XA RoHS:是 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 |
| KS8995XC | 制造商:RF Micro Devices Inc 功能描述: |
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