Fdd Floppy Disk
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US $12.25
Floppy drive controller.
Floppy disk controller. (FDC) is a special-purpose chips and twice the range and controls from the reading And write the hard drive from a computer disk. (FDD).
FDC run single board up to four floppy disk drive. FDC to the bus system of the computer displayed and assigned. A number of ports I / O and CPU, it will be connected to the DMA channel control FDC is often the means of transmission. DMA.
Often with the FDC . Communicate CPU via the bus industry standards. Architecture (ISA), but the kind of option is usually in the design. FDC, in the Super I / O chip that communication The bus stand via low.
Most functions. Operated by the FDC FDC IC, but some are performed by external hardware circuit.
FDC function IC.
- Generate. are MFM model for the data recorded.
- Decoding and executing commands such as reading and ask. Other formats.
- Check CRC error generation. Check
- Data synchronization.
External hardware function.
- Selected FDD.
- Switching - on vehicles in the FDD.
- To reset the FDC IC.
- Enable / Disable DMA interrupts the signal and the FDC-IC.
- Logical separation of data.
- Writing a logic of compensation before
- Line driver signal for FDD.
- Call signal the FDD.
Input. / Output port
FDC has three ports, I / O that is.
- Port Information
- Main Status Register. (MSR).
- Port Control.
The first two are external Within the FDC IC, while the port is under the control hardware.
Port Information
This port is used by the software for three different purposes. .
- While orders for FDC IC, commands and command parameters from bytes. FDC IC through this port.
Main Status Register. (MSR).
This port is used by software, to check information on the state as a whole. FDC IC and the FDD.
Digital Port Control.
This port is used by software to control any and function. FDC FDD IC.
About the Author
This article written by Tiel.
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