sab8253xfs.txt

该文件是rt_linux

*_Functional Specification of SAB8253X ASLX Driver for Linux_*

 


The SAB8253X serial interface chip is very flexible.  It supports most
of the standard asynchronous serial transmission modes as well as
synchronous Bit Oriented Protocols (BOPs) and character oriented
protocols.  The Linux ASLX Driver system provides an extremely flexible
Linux interface to the SAB8253X serial interface chips that are used on
the Aurora <http://www.auroratech.com/> XX20 adapter cards and
Multichannel server units whether they are inserted directly into a host
bus or whether they are connected via a PCI extension system such as the
Aurora XP7.

 


  Supported Hardware

 

The Linux ASLX Driver supports Aurora SAB8253X communications adapter
cards and systems for PCI bus systems.  Possible adapter card
configurations are identified as MN20 where M is 1, 2, 4, 8 and N is 0
or 5.  M is the number of ports.  N = 0 means that the adapter card does
not support synchronous modes.  N = 5 means the adapter card modes are
unrestricted.  The multichannel server system consists of an host
adapter card that attaches to an expansion box via the G-Link connection
cable.  The expansion box can host 2000, 2500 and 3500 type Expansion
Boards (EBs).  The 2000 EB provides 15 asynchronous-only RS-232 ports
and 1 unrestricted RS-232 port.  The 2500 EB provides 16 unrestricted
RS-232 ports.  The 3500 EB provides 16 unrestricted serial ports, whose
physical signaling is under software control.  The XP7 is a PCI
expansion chassis. 

 

The ASLX correctly identifies the Aurora adapter card or Multichannel
server and EBs, determines capabilities and provides a software
interface to configurable capabilities (e.g., a choice of RS-232 [= the
default], RS 422/423, RS 449, EIA 530, V.35, X.21, RS-485 and none
[=off] signaling for 3500 EBs).  The use of an XP7 should be transparent
to the driver.  The ASLX driver will automatically correct incorrectly
programmed adapter card or Multichannel server serial EEPROMs. 
Moreover, in addition to the primary serial communications interface,
the ASLX driver provides a ^觤aintenance^