Teledyne LeCroy Summit T3-16 PCIe Multi-lane Protocol Analyzer User Manual - Manual (Page 250)

Teledyne LeCroy Configuration Register Types
238 Summit T3‐16 PCI Express Multi‐Lane Protocol Analyzer User Manual
12.2.1 DecodeRegister(offset)
The application calls this function while decoding a specific DWORD offset of the
specified CapabilityID. The offset is the decoding entry point, where the decoding path
starts.
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.
12.2.2 GetSize()
This function returns the size of the capability structure specified by CapabilityID.
12.3 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.
12.4 Primitives
Decoding uses the following primitives.
12.4.1 GetRegisterField
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.