TC8569AF

The TC8569AF is a single chip LSI for floppy disk controller, which has VFO and other circuits with FDC chip for interfacing a processor to floppy disk drive and supports data rates up to 1Mbps.

Features of the TC8569AF are:(1)si-gate CMOS single chip LSI; (2)single +5V power supply; (3)80 pin plastic flat package; (4)compatible with 8080 system data and control buses; (5)built-in VFO circuit; (6)standby function for battery operation.; (7)MFM recording formats(1bI / 500K l 250Kbps ); (8)FM recording formats(250k1125Kbps); (9)built-in tvrite pre-compensation circuit; (10)motor enable control for 2 drives; (11)built-in address decorder; (12)multi-sector data transfer; (13)multi-track data transfer; (14)direct interface to FDD with Ci4TOS type interface system; (15)programmable step rate time; (16)compatible with IBM diskette 1 and 2; (17)DMA/Non-DMA (interrupt) data transfer.

The absolute maximum ratings of the TC8569AF can be summarized as:(1)supply voltage:-0.5 to 7.0V;(2)input voltage:Vss-0.5 to Vdd+0.5V;(3)output current1:±2.0mA;(4)storage temperature:-65 to 125;(5)operating temperature:-30 to 70;(6)power dissipation:300mW.In this application circuit, 1Mbps, 500Kbps, 300Kbps and 250Kbps can be supported.The extra reset routine is necessary to expect a correct operation when XRATEl and XRATEO are changed.This is because that some glitches are generated when the system clock or MODE input level is changed.extra reset is not necessary to use TC8569AF in a fixed mode (MODE input and the system clock are changed during the operation).As commenting in the chapter 3.5, you should pay attention to the difference between the internal FDC of TC8569AF and the conventional type of FDC in programing the application software. If you use the standby mode,the control program for FDC should be modified as follow.The interval times mentioned above are a direct function of the clock. The times indicated above are for a SMHz clock. If the clock frequency is 4MHz (mini floppy), all the times are twice as long as the times indicated above. If the clock frequency is 16MHz (Perpendicular Magnetized Floppy), all the times are half as long as the times indicated above.