Car chassis wire harness wholesalers introduces the 80-pin cable conforming to the ATA-5 specification has three connector heads of blue, black and gray. The blue connector must be connected to the motherboard IDE interface, the black connector is connected to the main hard disk, and the gray connector is connected to the slave disk. This order cannot be arbitrarily reversed. It is related to the signal definition in the cable. According to the specification, the 34th pin (PDIAG-ground) of the cable connector must be connected to the motherboard IDE interface but not to the hard disk. It corresponds to the cable. The 67th line in the middle. Some of the wires have a hole in the 67th line, which is used to break the signal. Some of them are cut off internally even though they are not. In addition, the 28th pin signal (CSEL) of the cable connector is responsible for the identification of the primary hard disk. It is only connected to the primary hard disk interface through the 55th cable in the cable and is not connected to the secondary disk. Therefore, the order of these interfaces is not available. changed.

The ATA connector uses a total of 40 connection pins, one for each signal line. The structure of the 40-pin cable is very simple: except for a few dedicated signal control lines, the remaining data transmission lines, the signal control line is responsible for ATA mode detection, master-slave disk recognition and other control functions, while the data transmission line is Used for data transmission; the line arrangement of the cable is in one-to-one correspondence with the connector pins. The 80-pin cable is not the case. Although the signal definition of the interface pin angle has not changed, the order of the internal signal lines has changed greatly. The even-numbered lines are all newly added ground lines, while the odd-numbered lines are completely extended. There are 40-pin cable. 40 ground lines and 40 lines are staggered with each other, which effectively reduces the crosstalk of internal signal lines and external electromagnetic interference, making data transmission more stable! It should be mentioned that the 39th line of the 80-pin cable is defined as a Key-pin (also known as IIRC, which is connected to the 20-pin of the connector). The hard disk controller on the motherboard identifies the hard disk based on this signal. Supports 66.6MB/s Ultra DMA 4 mode. If you want to learn more about Motorcycle harness wholesalers,you can contact us.