Host interface circuit for preventing data loss and improving in

Details Host interface circuit for preventing data loss and improving in Host interface circuit for preventing data loss and improving in

1997-10-14

1999-12-14

An, Meng-Ai T.

Electrical computers and digital data processing systems: input/

Input/output data processing

345501, 345502, 375260, 395101, 365193, G06F 1700

Patent

active

060030968

ABSTRACT:
A host interface circuit for an image forming apparatus interfaces parallel data received from a host. The host interface circuit alternately latches received data in first and second latch circuits each time a strobe input signal is received from the host. The strobe input signal is processed by a noise filter and then provided to a select logic circuit which, in turn, provides first and second select signals to the first and second latch circuits and to first and second interrupt control circuits. The latter drive a central processing unit (CPU) interrupt drive circuit. Data from the two latch circuits are multiplexed and buffered prior to provision to the CPU. Acknowledge, hardware-busy and software-busy signals are also generated.

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