Host interface circuit for preventing data loss and improving interface speed for an image forming apparatus by latching received data in response to a strobe input signal
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United States of America Patent
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-
Dec 14, 1999
Grant Date -
N/A
app pub date -
Oct 14, 1997
filing date -
Oct 17, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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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