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Input/Output Interfaces
5.5Parallel Interface Support
The SFF and CMT form factors include a system board header (J50) that supports an optional parallel bracket/cable assembly that provides a parallel interface for a peripheral device such as a printer. The parallel interface supports
■Standard Parallel Port (SPP) mode
■Enhanced Parallel Port (EPP) mode
■Extended Capabilities Port (ECP) mode
These three modes (and their submodes) provide complete support as specified for an IEEE 1284 parallel port.
5.5.1 Standard Parallel Port Mode
The Standard Parallel Port (SPP) mode uses
5.5.2 Enhanced Parallel Port Mode
In Enhanced Parallel Port (EPP) mode, increased data transfers are possible (up to 2 MB/s) due to a hardware protocol that provides automatic address and strobe generation. EPP revisions 1.7 and 1.9 are both supported. For the parallel interface to be initialized for EPP mode, a negotiation phase is entered to detect whether or not the connected peripheral is compatible with EPP mode. If compatible, then EPP mode can be used. In EPP mode, system timing is closely coupled to EPP timing. A watchdog timer is used to prevent system lockup.
5.5.3 Extended Capabilities Port Mode
The Extended Capabilities Port (ECP) mode, like EPP, also uses a hardware
The ECP mode includes several
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