 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
LAN9252V/ML датащи(PDF) 137 Page - Microchip Technology |
|
|
|||||||||||||||||||||||||||||
LAN9252V/ML датащи(HTML) 137 Page - Microchip Technology |
|
|
137 / 329 page  2015 Microchip Technology Inc. DS00001909A-page 137 LAN9252 The TDR operates by transmitting pulses on the selected twisted pair within the Ethernet cable (TX in MDI mode, RX in MDIX mode). If the pair being tested is open or shorted, the resulting impedance discontinuity results in a reflected signal that can be detected by the PHY. The PHY measures the time between the transmitted signal and received reflec- tion and indicates the results in the TDR Channel Length field of the PHY x TDR Control/Status Register (PHY_TDR_- CONTROL_STAT_x). The TDR Channel Length field indicates the “electrical” length of the cable, and can be multiplied by the appropriate propagation constant in Table 11-5 to determine the approximate physical distance to the fault. FIGURE 11-5: TDR USAGE FLOW DIAGRAM Note: The TDR function is typically used when the link is inoperable. However, an active link will drop when oper- ating the TDR. Disable AMDIX and Force MDI (or MDIX) Write PHY Reg 27: 0x8000 (MDI) - OR - Write PHY Reg 27: 0xA000 (MDIX) TDR Channel Status Complete? Disable ANEG and Force 100Mb Full- Duplex Write PHY Reg 0: 0x2100 Enable TDR Write PHY Reg 25: 0x8000 NO Reg 25.8 == 0 YES Reg 25.8 == 1 Check TDR Control/Status Register Read PHY Reg 25 Save: TDR Channel Type (Reg 25.10:9) TDR Channel Length (Reg 25.7:0) MDIX Case Tested? YES Repeat Testing in MDIX Mode Done Start |
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
