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The parallel port functionality of the FDC37C932 include the following modes:
u
Normal mode (or Compatibility mode) - an industry-standard parallel interface mode. Normal
mode provides an asynchronous, byte-wide forward channel (host to peripheral), and is the base
mode common to all compliant interfaces.
u
SPP mode (or Byte or Bi-Dir mode) - compatible with IBM PS/2 hosts. SPP is an asynchronous,
byte-wide reverse channel (peripheral to host) mode using the eight data lines of the interface for
data, and the control/status lines for handshaking. Transfer direction is controlled by the host
when the peripheral and the host both support bi-directional use of data lines.
u
EPP mode - provides an asynchronous, byte-wide, bi-directional channel controlled by the host
device. This mode also provides separate address and data cycles over the eight data lines of the
interface. EPP increases the data transfer performance to 2 MB per second while retaining
backward compatibility with existing AT and PS/2 compatible interfaces.
u
ECP mode - similar to EPP, providing an asynchronous, byte-wide, bi-directional channel
controlled by the host device. Additionally, ECP implements a control line to distinguish between
command and data transfers. A command may optionally be used to indicate single byte data
compression or channel address. Other ECP mode features include:
−
Supports 2 MB per second data transfer rate
−
High performance, half duplex, forward and reverse channel
−
Interlocked handshake for fast, reliable data transfer
−
Channel addressing for low-cost peripherals
−
Link and data layer separation
−
Active output drivers and adaptive signal timing
−
Peer-to-peer capability
The addresses and interrupts used by the external parallel port can be assigned in AMIBIOS Setup.
Refer to the System Setup for information to configure the ports. The parallel port addresses and
interrupts are shown in the following table.
Port
Address Interrupt
LPT1 378-37A IRQ7 or IRQ5
LPT2 278-27A IRQ7 or IRQ5
LPT3 3BC-3BE IRQ7 or IRQ5
Expansion Connector
The expansion connector carries signals from SCSI, Super I/O, and graphics controllers to the I/O
connector board (MSMT328) for external devices.
PCI-to-ISA Bridge
The Intel 82379AB System I/O-APIC (Advanced Programmable Interrupt Controller) bridges the ISA
bus off the Primary Compatibility PCI bus (PCI bus 0). The 82379AB supports all four ISA expansion
slots.
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