Teledyne LeCroy SimPASS PE PCI Express Software User Manual - Manual (Page 110)

Appendix A: Configuration Space Decoding SimPASS PE Software User Manual
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LeCroy Corporation
A.3 Configuration Register Types
The following reserved variables are defined global constants.
•
CFGREG_UNDEFINED
• CFGREG_HWINIT
• CFGREG_RO
• CFGREG_RW
• CFGREG_RW1C
• CFGREG_ROS
• CFGREG_RWS
• CFGREG_RW1CS
• CFGREG_RSVDP
• CFGREG_RSVDZ
Note: These reserved variables match the Configuration Register Types of Table 7-2 in
Section 7.4 of the PCI Express Base Specification, Rev. 2.1.
A.4 Primitives
Decoding uses the following primitives.
GetRegisterField( dword_offset, bit_offset, field_length )
This function returns a register field of length field_length, starting at bit position
bit_offset in DWORD dword_offset.
•
dword_offset: DWORD offset of the register field location
• bit_offset: Bit offset of the register field location
• field_length: Length of the register field 
For example, GetRegisterField( 1, 9, 2 ); means: Go to DWORD 1, bit offset 9, and
returns 2 bits.