JYTEK 6743X Series, User Manual

Page: 31 / 42

Registers 25
3 Registers
The descriptions of the registers and structure of the 6743X Series
are outlined in this chapter. The information in this chapter will
assist programmers, who wish to handle the card with low-level
programs.
In addition, the low level programming syntax is introduced. This
information can help beginners to operate the 6743X in the short -
est possible time.
3.1 PCI PnP Registers
This PCI card functions as a 32-bit PCI target device to any mas -
ter on the PCI bus. There are three types of registers: PCI Config -
uration Registers (PCR), Local Configuration Registers (LCR) and
6743x series registers.
The PCR, which is PCI-bus specifications compliant, is initialized
and controlled by the plug & play (PnP) PCI BIOS. Users may
obtain more information on the PCI BIOS specification to better
understand the operation of the PCR. Please contact PCISIG to
acquire the specifications of the PCI interface.
The PCI bus controller PCI-9050 is provided by PLX technology
Inc. (www.plxtech.com). For more information about the LCR,
please visit PLX technology’s web site to download relative infor -
mation. It is not necessary for users to fully understand the details
of the LCR if the software library provided is used. The PCI PnP
BIOS assigns the base address of the LCR. The assigned address
is located at an offset of 14h from the PCR.
The 6743x series registers are discussed in the next section. The
base address, which is also assigned by the PCI PnP BIOS, is
located at an offset of 18h from the PCR. Therefore, users can
read the address 18h from the PCR to obtain its base address by
using the BIOS function call. Do not attempt to modify the base
address and interrupt that have been assigned by the PCI PnP
BIOS, it may cause resource conflicts with your system.