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| 型号： | KSZ9021RN |
| 厂商： | Micrel Inc |
| 文件页数： | 53/58页 |
| 文件大小： | 0K |
| 描述： | IC TXRX 10/100/1000 SGL 48QFN |
| 特色产品： | KSZ9021RN Single-port Gigabit Transceiver |
| 标准包装： | 260 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 8/8 |
| 规程： | 千兆位以太网 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 包装： | 托盘 |
| 配用： | 576-3874-ND - BOARD EVALUATION FOR KSZ9021RN |
| 其它名称： | 576-3637 KSZ9021RN-ND |
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2010 Microchip Technology Inc.
DS22265A-page 57
MCP444X/446X
6.2.6
HS MODE
The I2C specification requires that a high-speed mode
device must be ‘activated’ to operate in high-speed
(3.4 Mbit/s) mode. This is done by the Master sending
a special address byte following the START bit. This
byte is referred to as the high-speed Master Mode
Code (HSMMC).
The MCP44XX device does not acknowledge this byte.
However, upon receiving this command, the device
switches to HS mode. The device can now
communicate at up to 3.4 Mbit/s on SDA and SCL
lines. The device will switch out of the HS mode on the
next STOP condition.
The master code is sent as follows:
1.
START condition (S)
2.
High-Speed Master Mode Code (0000 1XXX),
The XXX bits are unique to the high-speed (HS)
mode Master.
3.
No Acknowledge (A)
After switching to the High-Speed mode, the next
transferred byte is the I2C control byte, which specifies
the device to communicate with, and any number of
data bytes plus acknowledgements. The Master
Device can then either issue a Repeated Start bit to
address a different device (at High-Speed) or a Stop bit
to return to Fast/Standard bus speed. After the Stop bit,
any other Master Device (in a Multi-Master system) can
arbitrate for the I2C bus.
See Figure 6-10 for illustration of HS mode command
sequence.
For more information on the HS mode, or other I2C
modes, please refer to the Phillips I2C specification.
6.2.6.1
Slope Control
The slope control on the SDA output is different
between the Fast/Standard Speed and the High-Speed
clock modes of the interface.
6.2.6.2
Pulse Gobbler
The pulse gobbler on the SCL pin is automatically
adjusted to suppress spikes < 10 ns during HS mode.
FIGURE 6-10:
HS Mode Sequence.
S
A
‘0 0 0 0 1 X X X’b
Sr
A
‘Slave Address’
A/A
“Data”
P
S = Start bit
Sr = Repeated Start bit
A = Acknowledge bit
A = Not Acknowledge bit
R/W = Read/Write bit
R/W
P = Stop bit (Stop condition terminates HS Mode)
F/S-mode
HS-mode
HS-mode continues
F/S-mode
Sr
A
‘Slave Address’ R/W
HS Select Byte
Control Byte
Command/Data Byte(s)
Control Byte
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相关代理商/技术参数 |
参数描述 |
|---|---|
| KSZ9021RN-EVAL | 功能描述:以太网开发工具 Gigabit Ethernet Transceiver with RGMII - Evaluation Board RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
| KSZ9021RNI | 功能描述:以太网 IC Gigabit Ethernet Transceiver with RGMII, I-Temp RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ9031MNX | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:The KSZ9031MNX is a completely integrated triple-speed (10Base-T/100Base-TX/1000Base-T) Ethernet physicallayer transceiver for transmission and reception of data on standard CAT-5 unshielded twisted pair (UTP) cable. |
| KSZ9031MNXCA | 功能描述:以太网 IC 1-Port Gigabit Ethernet PHY RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ9031MNXCA TR | 功能描述:以太网 IC 1-Port Gigabit Ethernet PHY RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
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