IDT CPS-1848, User Manual

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10. Registers > Address Map
CPS-1848 User Manual 198 June 2, 2014
Formal Status This document is confidential and is subject to an NDA.
Integrated Device Technology
10.1.2 Interpretation of Reserved Register Bits
The CPS-1848 uses the S-RIO definition for the management of reserved register bits. This treatment is defined in Table 3-2 of
the RapidIO Specification (Rev. 2.1), Part 3. Under the “Target Behavior” column, the expected return of the reserved bits of a
register read is 0 for all S-RIO defined reserved registers. The CPS-1848 has extended this definition to its “Implementation
Defined Space” as well. Although the device initializes with zeros in these bit positions, it does not prevent the user from writing
to these bits. When writing registers with reserved fields, IDT recommends writing zeros to those reserved fields.
10.1.3 Backward Compatibility
The RapidIO Specification (Rev. 2.1) maintains backward compatibility with the RapidIO Specification (Rev. 1.3) where
possible. Thus, the S-RIO standard registers are similarly backward compatible. IDT has also made the CPS-1848 backward
compatible with previous IDT 1.3-compliant switch devices. IDT-specific functions and associated registers are similarly
backward compatible where possible.
10.1.4 Register Type Field Definitions
10.2 Address Map
The CPS-1848’s address map is listed in Table 75 . For most registers, there is one instance for each port. The address on
each register indicates the address for port 0. For all other ports, there is an offset from port 0.
Type Description
RW Read/Write.
RO Read Only. Must mask for all writes.
WO Write Only. Reading these fields returns undefined data.
RR Reset on Read. These registers are cleared to 0 when read.
FR Fixed Read. These values are constant.
W1R Write Once Reset.
Table 75: Address Map
Base Address Register (Full Name) Register (Short Name)
RapidIO Capability Registers (CARs)
0x000000 Device Identity CAR DEV_IDENT_CAR
0x000004 Device Information CAR DEV_INF_CAR
0x000008 Assembly Identity CAR ASSY_IDENT_CAR
0x00000C Assembly Information CAR ASSY_INF_CAR
0x000010 Processing Element Features CAR PROC_ELEM_FEAT_CAR
0x000014 Switch Port Information CAR SWITCH_PORT_INF_CAR
0x000018 Source Operations CAR SRC_OPS_CAR
0x000030 Switch Multicast Support CAR SWITCH_MCAST_SUP_CAR
0x000034 Switch Route Table Entries Table Limit CAR SWITCH_RTE_TBL_LIM_CAR