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參數資料
| 型號： | KSZ8995XA-EVAL |
| 廠商： | Micrel Inc |
| 文件頁數： | 18/51頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR KSZ8995XA |
| 標準包裝： | 1 |
| 主要目的： | 接口，以太網控制器（PHY 和 MAC） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | KSZ8995XA |
| 主要屬性： | 5 個端口，100BASE-TX/100BASE-FX/10BASE-T |
| 次要屬性： | 2xMII，SNI |
| 已供物品： | 板，CD，文檔，電源 |
| 產品目錄頁面： | 1114 (CN2011-ZH PDF) |
| 相關產品： | KSZ8995XAB3-ND - IC SWITCH 5-PORT 10/100 128PQFP KSZ8995XA4-ND - IC SWITCH 5-PORT 10/100 128PQFP 576-1042-ND - IC SWITCH 10/100 5PORT 128PQFP 576-1041-ND - IC SWITCH 10/100 5PORT 128PQFP |
| 其它名稱： | 576-1642 |
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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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相關代理商/技術參數 |
參數描述 |
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| KSZ8995X-EVAL | 功能描述:BOARD EVALUATION FOR KSZ8995X RoHS:是 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、數據表和用戶手冊 其它名稱:520-1035 |
| KSZ8997 | 功能描述:以太網 IC 8 Port 10/100 Switch with PHY and Frame Buffers (Lead Free) RoHS:否 制造商:Micrel 產品:Ethernet Switches 收發(fā)器數量:2 數據速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8999 | 功能描述:以太網 IC 8 Port 10/100 Switch plus MII with PHY and Frame Buffers (Lead Free) RoHS:否 制造商:Micrel 產品:Ethernet Switches 收發(fā)器數量:2 數據速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8999-EVAL | 功能描述:以太網開發(fā)工具 KSZ8999 Evaluation Board RoHS:否 制造商:Micrel 產品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| KSZ8999-EVAL | 制造商:Micrel Inc 功能描述:BOARD EVALUATION FOR KSZ8999 |
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