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參數(shù)資料
| 型號： | KSZ8995XA |
| 廠商： | MICREL INC |
| 元件分類： | 網(wǎng)絡接口 |
| 英文描述： | Integrated 5-Port 10/100 QoS Switch |
| 中文描述： | DATACOM, LAN SWITCHING CIRCUIT, PQFP128 |
| 封裝： | LEAD FREE, PLASTIC, QFP-128 |
| 文件頁數(shù)： | 27/51頁 |
| 文件大?。?/td> | 305K |
| 代理商： | KSZ8995XA |
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May 2005
27
M9999-051305
KS8995XA
Micrel, Inc.
DiffServ Field (Binary)
000000
000001
000010
000011
000100
111011
111100
111101
111110
111111
Code Point
DSCP[0]
DSCP[1]
DSCP[2]
DSCP[3]
DSCP[4]
DSCP[59]
DSCP[60]
DSCP[61]
DSCP[62]
DSCP[63]
KS8995X (Reg. and Bit)
0x67, bit 0
0x67, bit 1
0x67, bit 2
0x67, bit 3
0x67, bit 4
0x60, bit 3
0x60, bit 4
0x60, bit 5
0x60, bit 6
0x60, bit 7
Table 5. DiffServ Code Point
Once classification of the packets has been determined either by port-based priority, 802.1p tag-based priority or DiffServ
priority, they are placed in either the high or low priority queue on the egress port. The user can enable the egress priority queues
on a per port basis by setting bit 0 of registers 0x10, 0x20, 0x30, 0x40, and 0x50 for ports 1, 2, 3, 4 and 5, respectively. If the
egress priority queue for a given port is not set, the port will treat all packets as if they are the same priority, even though packets
are classified on their ingress ports. If the egress priority queue for a given port is enabled, packets are serviced based on the
user programmable egress policy. The priority scheme selection is set in register 0x05 bits[3-2] as shown in Table 6.
Register
0x05, bit 3
0
0
1
1
Register
0x05, bit 2
0
1
0
1
Egress Priority Scheme
Always deliver high priority packets first
Deliver high/low priority packets at a ratio of 10/1
Deliver high/low priority packets at a ratio of 5/1
Deliver high/low priority packets at a ratio of 2/1
Table 6. Transmit Priority Ratio
The KS8995XA offers support for port-based, 802.1p tag-based, and IPv4 DiffServ priority, as well as programmable egress
policies. These KS8995XA QoS features enable identifying, classifying and forwarding packets based on their priority. The
system designer is able to use this device to build network elements that give more control over system resources, priority
service to mission critical applications, and can be integrated into the next generation of multimedia networks.
Rate Limit Support
KS8995XA supports hardware rate limiting on “receive” and “transmit” independently on a per port basis. It also supports rate
limiting in a priority or non-priority environment. The rate limit starts from 0Kbps and goes up to the line rate in steps of 32Kbps.
The KS8995XA uses one second as an interval. At the beginning of each interval, the counter is cleared to zero, and the rate
limit mechanism starts to count the number of bytes during this interval.
For receive, if the number of bytes exceeds the programmed limit, the switch will stop receiving packets on the port until the
“one second” interval expires. There is an option provided for flow control to prevent packet loss. If the rate limit is programmed
greater than or equal to 128Kbps and the byte counter is 8K bytes below the limit, the flow control will be triggered. If the rate
limit is programmed lower than 128Kbps and the byte counter is 2K bytes below the limit, the flow control will be triggered.
For transmit, if the number of bytes exceeds the programmed limit, the switch will stop transmitting packets on the port until
the “one second” interval expires.
If priority is enabled, the KS8995XA can support different rate controls for both high priority and low priority packets. This can
be programmed through Registers 21 – 27.
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相關代理商/技術參數(shù) |
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| KSZ8995XA4 | 功能描述:IC SWITCH 5-PORT 10/100 128PQFP RoHS:是 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 應用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應商設備封裝:400-PBGA（27x27） 包裝:散裝 |
| KSZ8995XAB3 | 功能描述:IC SWITCH 5-PORT 10/100 128PQFP RoHS:是 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 應用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應商設備封裝:400-PBGA（27x27） 包裝:散裝 |
| KSZ8995XA-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 KSZ8995XA Evaluation Board RoHS:否 制造商:Micrel 產(chǎn)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: |
| 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(chǎn)零件編號 系列:- 標準包裝:1 系列:- 類型:MCU 適用于相關產(chǎn)品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、纜線、軟件、數(shù)據(jù)表和用戶手冊 其它名稱:520-1035 |
| KSZ8997 | 功能描述:以太網(wǎng) IC 8 Port 10/100 Switch with PHY and Frame Buffers (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)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 |
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