参数资料
| 型号： | PIC12F635T-I/MF |
| 厂商： | Microchip Technology |
| 文件页数： | 7/74页 |
| 文件大小： | 0K |
| 描述： | IC MCU FLASH 1KX14 8DFN |
| 标准包装： | 3,300 |
| 系列： | PIC® 12F |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 20MHz |
| 外围设备： | 欠压检测/复位，POR，WDT |
| 输入/输出数： | 5 |
| 程序存储器容量： | 1.75KB（1K x 14） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 128 x 8 |
| RAM 容量： | 64 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2 V ~ 5.5 V |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-VDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 配用： | AC164324-ND - MODULE SKT FOR MPLAB 8DFN/16QFN XLT08DFN2-ND - SOCKET TRANSITION ICE 14DIP/8DFN AC162057-ND - MPLAB ICD 2 HEADER 14DIP XLT08DFN-ND - SOCKET TRANSITION ICE 8DFN AC164032-ND - ADAPTER PICSTART PLUS 8DFN/DIP AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC |
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Micrel, Inc.
KSZ8841-PMQL
October 2007
15
M9999-100407-1.5
A wake-up signal is caused by:
1. Detection of a change in the network link state
2. Receipt of a network wake-up frame
3. Receipt of a Magic Packet
Link Change
Link status wake events are useful to indicate a change in the network’s availability, especially when this change may
impact the level at which the system should re-enter the sleeping state. For example, a change from link off to link on
may trigger the system to re-enter sleep at a higher level (D2 versus D3) so that wake frames can be detected.
Conversely, a transition from link on to link off may trigger the system to re-enter sleep at a deeper level (D3 versus D2)
since the network is not currently available.
Note
: References to D0, D1, D2, and D3 are power management states defined in a similar fashion to the way they are defined for
PCI. For more information, refer to the PCI specification at www.pcisig.com/specifications/conventional/pcipm1.2.pdf.
Wake-up Packet
Wake-up packets are certain types of packets with specific CRC values that a system recognizes as a ‘wake up’ frame.
The KSZ8841-PMQL supports up to four users defined wake-up frames as below:
1. Wake-up frame 0 is defined in registers 0x0220-0x022A and is enabled by bit 0 in wakeup frame control register.
2. Wake-up frame 1 is defined in registers 0x0230-0x023A and is enabled by bit 1 in wakeup frame control register.
3. Wake-up frame 2 is defined in registers 0x0240-0x024A and is enabled by bit 2 in wakeup frame control register.
4. Wake-up frame 3 is defined in registers 0x0250-0x025A and is enabled by bit 3 in wakeup frame control register
Magic Packet
Magic Packet technology is used to remotely wake up a sleeping or powered off PC on a LAN. This is accomplished by
sending a specific packet of information, called a Magic Packet frame, to a node on the network. When a PC capable of
receiving the specific frame goes to sleep, it enables the Magic Packet RX mode in the LAN controller, and when the
LAN controller receives a Magic Packet frame, it will alert the system to wake up.
Magic Packet is a standard feature integrated into the KSZ8841-PMQL. The chip implements multiple advanced power-
down modes including Magic Packet to conserve power and operate more efficiently.
Once the KSZ8841-PMQL has been put into Magic Packet Enable mode (WFCR[7]=1), it scans all incoming frames
addressed to the node for a specific data sequence, which indicates to the chip this is a Magic Packet (MP) frame.
A Magic Packet frame must also meet the basic requirements for the LAN technology chosen, such as Source Address
(SA), Destination Address (DA), which may be the receiving station’s IEEE address or a multicast or broadcast address
and CRC.
The specific sequence consists of 16 duplications of the IEEE address of this node, with no breaks or interruptions. This
sequence can be located anywhere within the packet, but must be preceded by a synchronization stream. The
synchronization stream allows the scanning state machine to be much simpler. The synchronization stream is defined
as 6 bytes of FFh. The device will also accept a broadcast frame, as long as the 16 duplications of the IEEE address
match the address of the machine to be awakened.
EXAMPLE
If the IEEE address for a particular node on a network is 11h 22h, 33h, 44h, 55h, 66h, the LAN controller would be
scanning for the data sequence (assuming an Ethernet frame):
DESTINATION SOURCE MISC: FF FF FF FF FF FF - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11
22 33 44 55 66 -11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 -11 22 33 44 55 66 -11 22 33 44 55 66 -11
22 33 44 55 66 -11 22 33 44 55 66 -11 22 33 44 55 66 -11 22 33 44 55 66 -11 22 33 44 55 66 -11 22 33 44 55 66 -11
22 33 44 55 66 - MISC -CRC.
There are no further restrictions on a Magic Packet frame. For instance, the sequence could be in a TCP/IP packet or
an IPX packet. The frame may be bridged or routed across the network without affecting its ability to wake-up a node at
the frame’s destination
If the LAN controller scans a frame and does not find the specific sequence shown above, it discards the frame and
takes no further action. If the controller (KSZ8841-PMQL) detects the data sequence, however, it then alerts the PC’s
power management circuitry (asserted the PMEN pin) to wake up the system.
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