- 您现在的位置：买卖IC网 > PDF目录11401 > PIC16LC642-04/SP (Microchip Technology)IC MCU OTP 4KX14 COMP 28DIP PDF资料下载
参数资料
| 型号： | PIC16LC642-04/SP |
| 厂商： | Microchip Technology |
| 文件页数： | 52/125页 |
| 文件大小： | 0K |
| 描述： | IC MCU OTP 4KX14 COMP 28DIP |
| 产品培训模块： | Asynchronous Stimulus |
| 标准包装： | 15 |
| 系列： | PIC® 16C |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 4MHz |
| 外围设备： | 欠压检测/复位，LED，POR，WDT |
| 输入/输出数： | 22 |
| 程序存储器容量： | 7KB（4K x 14） |
| 程序存储器类型： | OTP |
| RAM 容量： | 176 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 3 V ~ 6 V |
| 振荡器型： | 外部 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 28-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页当前第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页
Micrel, Inc.
KSZ8862-16/32MQL
April 2007
32
M9999-040407-3.0
Switching Engine
The KSZ8862M features a high-performance switching engine to move data to and from the MAC’s packet buffers. It
operates in store and forward mode, while the efficient switching mechanism reduces overall latency.
The switching engine has a 32KB internal frame buffer. This resource is shared between all the ports. There are a total of
256 buffers available. Each buffer is sized at 128B.
MAC Operation
The KSZ8862M strictly abides by IEEE 802.3 standards to maximize compatibility. Additionally, there is an added MAC
filtering function to filter Unicast packets. The MAC filtering function is useful in applications such as VoIP where
restricting certain packets reduces congestion and thus improves performance.
Inter Packet Gap (IPG)
If a frame is successfully transmitted, the minimum 96-bit time for IPG is measured between two consecutive packets. If
the current packet is experiencing collisions, then the minimum 96-bit time for IPG is measured from carrier sense (CRS)
to the next transmit packet.
Back-Off Algorithm
The KSZ8862M implements the IEEE standard 802.3 binary exponential back-off algorithm in half-duplex mode, and
optional "aggressive mode" back-off. After 16 collisions, the packet is optionally dropped depending upon the switch
configuration in SGCR1 [8].
Late Collision
If a transmit packet experiences collisions after 512 bit times of the transmission, then the packet is dropped.
Legal Packet Size
The KSZ8862M discards packets less than 64 bytes and can be programmed to accept packet size up to 1536 bytes in
SGCR2 [1]. The KSZ8862M can also be programmed for special applications to accept packet size up to 1916 bytes in
SGCR2 [2].
Flow Control
The KSZ8862M supports standard 802.3x flow control frames on both transmit and receive sides.
On the receive side, if the KSZ8862M receives a pause control frame, the KSZ8862M will not transmit the next normal
frame until the timer, specified in the pause control frame, expires. If another pause frame is received before the current
timer expires, the timer will be updated with the new value in the second pause frame. During this period (while it is flow
controlled), only flow control packets from the KSZ8862M are transmitted.
On the transmit side, the KSZ8862M has intelligent and efficient ways to determine when to invoke flow control. The flow
control is based on availability of the system resources, including available buffers, available transmit queues, and
available receive queues.
The KSZ8862M will flow control a port that has just received a packet if the destination port resource is busy. The
KSZ8862M issues a flow control frame (Xoff), containing the maximum pause time as defined in IEEE standard 802.3x.
Once the resource is freed up, the KSZ8862M then sends out the other flow control frame (Xon) with zero pause time to
turn off the flow control (turn on transmission to the port). A hysteresis feature is provided to prevent the flow control
mechanism from being constantly activated and deactivated.
The KSZ8862M flow controls all ports if the receive queue becomes full.
Half-Duplex Backpressure
A half-duplex backpressure option (not in IEEE 802.3 standards) is also provided. The activation and deactivation
conditions are the same in full-duplex mode. If backpressure is required, then the KSZ8862M sends preambles to defer
the other stations' transmission (carrier sense deference).
相关PDF资料 |
PDF描述 |
|---|---|
| VE-B4Y-IW | CONVERTER MOD DC/DC 3.3V 66W |
| PIC16LC642-04/SO | IC MCU OTP 4KX14 COMP 28SOIC |
| VE-B4X-IY | CONVERTER MOD DC/DC 5.2V 50W |
| PIC16C56-10/SS | IC MCU OTP 1KX12 20SSOP |
| VE-25B-CV-F2 | CONVERTER MOD DC/DC 95V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC16LC642T-04/SO | 功能描述:8位微控制器 -MCU 7KB 176 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16LC642T-04I/SO | 功能描述:8位微控制器 -MCU 7KB 176 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16LC64A-04/L | 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16LC64A-04/P | 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16LC64A-04/PQ | 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。