Teledyne LeCroy Summit Z3-16 PCI Express Multi-lane Exerciser User Manual - Manual (Page 98)

Teledyne LeCroy Configuration Register Types
98 Summit Z3‐16 PCI Express Multi‐Lane Exerciser User Manual
The Configuration Space Editor calls this function to determine how to decode the
assigned configuration space. The offset parameter is the DWORD to decode. 
An offset of 0 indicates bytes 00h‐03h, an offset of 1 indicates bytes 04h‐07h, and so on.
Note: The Configuration Space Editor can only decode one DWORD at a time.
A.2.2 GetSize()
This function returns the size of the capability structure specified by CapabilityID.
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.