Compuprint 10300 ユーザーガイド
Interfaces
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According to the IEEE - P1284 Standard, the pins assume different meanings and are identified by
different names depending on the actual handshaking mode as follows:
different names depending on the actual handshaking mode as follows:
• Compatibility mode (Centronics)
This is the lower level mode provides an asynchronous, byte-wide forward (host-to-peripheral)
channel with data and status lines used according to their original definitions. The interfaces power
up in the compatibility Mode Idle phase.
channel with data and status lines used according to their original definitions. The interfaces power
up in the compatibility Mode Idle phase.
• Nibble Mode
This mode provides an asynchronous, reverse (peripheral-to-host) channel, under control of
the host. In this mode, peripheral device to host data bytes are sent as two sequential, four-
the host. In this mode, peripheral device to host data bytes are sent as two sequential, four-
bit nibbles using the four peripheral-to-host status lines. These two modes cannot be active
simultaneously.
simultaneously.
• Byte Mode
This mode provides an asynchronous, byte-wide reverse (peripheral-to host) channel based
on eight data lines of the interface for data and the control/status lines for handshaking.
on eight data lines of the interface for data and the control/status lines for handshaking.
Byte mode is under host control and it cannot be simultaneously active with compatibility
mode.