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參數(shù)資料
| 型號(hào)： | PIC16C662T-04/PQ |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 52/125頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU OTP 4KX14 COMP 44-MQFP |
| 標(biāo)準(zhǔn)包裝： | 900 |
| 系列： | PIC® 16C |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 4MHz |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，LED，POR，WDT |
| 輸入/輸出數(shù)： | 33 |
| 程序存儲(chǔ)器容量： | 7KB（4K x 14） |
| 程序存儲(chǔ)器類型： | OTP |
| RAM 容量： | 176 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4 V ~ 6 V |
| 振蕩器型： | 外部 |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 44-QFP |
| 包裝： | 帶卷 (TR) |
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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).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PIC16C662T-04/L | IC MCU OTP 4KX14 COMP 44PLCC |
| PIC16C662T-04I/PT | IC MCU OTP 4KX14 COMP 44TQFP |
| JBXFD2G10MCSDSR | CONN PLUG 10POS STR CABLE CRIMP |
| PIC16C662T-04I/PQ | IC MCU OTP 4KX14 COMP 44-MQFP |
| PIC16C662T-04I/L | IC MCU OTP 4KX14 COMP 44PLCC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC16C662T-10/L | 功能描述:8位微控制器 -MCU 7KB 176 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C662T-10/PQ | 功能描述:8位微控制器 -MCU 7KB 176 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C662T-10/PT | 功能描述:8位微控制器 -MCU 7KB 176 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C662T-10E/L | 功能描述:8位微控制器 -MCU 7KB 176 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C662T-10E/PQ | 功能描述:8位微控制器 -MCU 7KB 176 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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