WD1691 Description
has been designed to minimize the external logic required to interface the 179X Family of Floppy Disk Controllers to a drive. With the use of an external VCO, the WD 1691 will generate the RCLK signal for the WD179X, while providing an adjustment pulse (PUMP) to control the VCO frequency. VFOE/WF de-multiplexing is also acplished and Write Prepensation signals have been included to interface directly with the WD2143...
WD1691 Key Features
- Eliminates external FDC Logic .. Data Separation/RCLK GENERATION .. Write Prepensation Signals
- VFOE/WF Demultiplexing
- Programmable Density o 8" or 5.25" Drive patible .. All inputs and outputs TTL patible ... Single +5V Supply
- lhe Data ~rator or Recovery Circuit has four inputs: DDEN, VCO, ROD, and VFOEIWF; and three outputs: PU