Software compatible parallel interface with bidirectional handshaking for serial peripherals
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United States of America Patent
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May 12, 2009
Grant Date -
Sep 8, 2005
app pub date -
Apr 9, 2005
filing date -
Oct 15, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
High-speed reliable parallel data transmission between a computer and a parallel peripheral is provided by a peripheral controller by way of a virtual parallel UART (VPU). The VPU provides a novel parallel interface for higher speed parallel interface operation. The VPU is included in the peripheral controller along with a conventional RS-232 UART. The peripheral-side interface of the peripheral controller provides full bidirectional handshaking with the parallel peripheral. The host-side interface of the peripheral controller provides a legacy serial port compatible interface. Mode information selectively configures operation in either a VPU (parallel) or a UART (serial) mode. Both modes appear identical to software executing on the computer, enabling the use of standard serial I/O drivers without modification, and providing transparent legacy mode compatibility even when the hardware is configured for VPU mode.
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