WD1100-21

The WD1100-21 buffer manager support device is designed to interface up to four disk drives and eight heads per drive, to a WD1010-05 and sector buffer.The WD1100-21 accepts the SDH register information(sector sixe,drive,head)and selests the appropriate drive and head.It receives the data from disk and develops RD and DRUN(head data and data run)suitable for the WD1010-05.The WD1100-21 also selects the sector buffer and provides six of the address lines.The other four address lines must be implemented externally.The WD1100-21 signals BRDY(buffer ready) when the buffer counter reaches the value stored in the SDH register.

WD1100-21 has some unique features: The first one is 6-bit auto-incrementing address bus.The second one is selects up to 4 disk drives.The third one is selects up to 8 heads per drive.The forth one is provides A RAM chip enable and ready.The fifth one is TTL,MOS compatible.The sixth one is 40 pin DIP package.The seventh one is NMOS technology, etc. Besides, there are some absolute maximum ratings about it.Ambient temperature under bias is 0 to 50.Voltage on amy pin with respect to Vss is -0.2 V to 7.0 V. Power dissipation is 1.5 watt.

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