参数资料
| 型号： | KS8993M |
| 厂商： | Micrel Inc |
| 文件页数： | 32/85页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 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） |
| 包装： | 管件 |
| 配用： | 576-1013-ND - BOARD EVAL EXPERIMENT KS8993M |
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Micrel, Inc.
KS8993M/ML/MI
April 2005
38
M9999-041205
Rate Limiting Support
The KS8993M supports hardware rate limiting independently on the “receive side” and on the “transmit side” on a
per port basis. Rate limiting is supported in both priority and non-priority environment. The rate limit starts from 0
kbps and goes up to the line rate in steps of 32 kbps. The KS8993M uses “one second” as the rate limiting
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 the interval.
On the “receive side”, if the number of bytes exceeds the programmed limit, the switch will stop receiving packets
on the port until the “one second” interval expires. Flow control can be enabled to prevent packet loss. If the rate
limit is programmed greater than or equal to 128 kbps and the byte counter is 8 Kbytes below the limit, flow
control will be triggered. If the rate limit is programmed lower than 128 kbps and the byte counter is 2 Kbytes
below the limit, flow control will also be triggered.
On the “transmit side”, 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 KS8993M can be programmed to support different rate limits for high priority packets and
low priority packets.
Configuration Interface
The KS8993M can operate as both a managed switch and an unmanaged switch.
In unmanaged mode, the KS8993M is typically programmed using an EEPROM. If no EEPROM is present, the
KS8993M is configured using its default register settings. Some defaults settings are configured via strap-in pin
options. The strap-in pins are indicated in the “KS8993M Pin Description and I/O Assignment” table.
I
2C Master Serial Bus Configuration
With an additional I
2C (“2-wire”) EEPROM, the KS8993M can perform more advanced switch features like
“broadcast storm protection” and “rate control” without the need of an external processor.
For KS8993M I
2C Master configuration, the EEPROM stores the configuration data for register 0 to register 109
(as defined in the KS8993M register map) with the exception of the “Read Only” status registers. After the de-
assertion of reset, the KS8993M will sequentially read in the configuration data for all 110 registers, starting from
register 0. The configuration access time (tprgm) is less than 15 ms, as depicted in the following figure.
....
RST_N
SCL
SDA
t
prgm<15 ms
Figure 7. KS8993M EEPROM Configuration Timing Diagram
The following is a sample procedure for programming the KS8993M with a pre-configured EEPROM:
1.
Connect the KS8993M to the EEPROM by joining the SCL and SDA signals of the respective devices. For the
KS8993M, SCL is pin 97 and SDA is pin 98.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| KS8993M_11 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Integrated 3-Port 10/100 Managed Switch with PHYs |
| KS8993MA5 | 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 |
| KS8993M-EVAL | 功能描述:BOARD EVAL EXPERIMENT KS8993M 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 |
| KS8993MI | 功能描述:IC SWITCH 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 |
| KS8993ML | 功能描述:IC SWITCH 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 |
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