RapidIO: The Next Generation Communication Fabric For Embedded Application

Appendix A. RapidIO Logical and Transport Layer Registers

Table A.1 shows the register map for the approved RapidIO specifications. There are two classes of registers defined in the RapidIO architecture. There are capability registers (CARs) and command and status registers (CSRs). CARs are read-only registers, which provide information to the system describing the capabilities of the RapidIO device. The CSRs are read/write registers that are used to configure a RapidIO device and to provide current status on the operation or performance of the RapidIO device.

Table A.1. Integrated register map

Configuration space byte offset	Register name (word 0)	Register name (word 1)
0×0	Device identity CAR	Device information CAR
0×8	Assembly identity CAR	Assembly information CAR
0×10	Processing element features CAR	Switch port information CAR
0×18	Source operations CAR	Destination operations CAR
0×20–38	Reserved
0×3c	Data streaming information CAR	Reserved
0×40	Mailbox CSR	Write-port CSR Doorbell CSR
0×48	Data streaming logical layer control CSR	Processing element logical layer control CSR
0×50	Reserved
0×58	Local configuration space high base address CSR	Local configuration space base address CSR
0×60	Base device ID CSR	Reserved
0×68	Host base device ID lock CSR	Component tag CSR
0×70–F8
0×100–FFF8	Extended features space
0×10000–FFFFF8	Implementation-defined space

Table A.2. Configuration space reserved access behavior

Byte offset	Space name	Item	Initiator behavior	Target behavior
0×0–3C	Capability register space	Reserved bit	Read ...