Specifications

System Registers 7-1
Chapter 7
System Registers
The system registers are divided into two main groups:
• TLSB registers
• Node-specific registers
TLSB registers are used for internode communications and transactions
over the TLSB bus. Node-specific registers implement functions related to
the operation of the module.
Each node implements some TLSB required registers as well as node-
specific registers. All system registers are located in node spaces and are
accessed using CSR read or write commands. Nodes respond to all ad-
dresses within the node space. If a read is performed to a valid node, but
to a CSR that is not implemented, the return data is Unpredictable.
This chapter discusses the system registers in four sections as follows:
• TLSB registers
• CPU module-specific registers
• Memory module-specific registers
• I/O port-specific registers
The discussions proceed as follows: Section 7.3 describes all the registers
required to implement the system platform. Sections 7.4, 7.5, and 7.6 list
registers on CPU, memory, and I/O ports, respectively, but describe only
module-specific registers.
7.1 Register Conventions
Certain conventions are followed in register descriptions and in references
to bits and bit fields:
• Registers are referred to by their mnemonics, such as TLCNR regis-
ter. The full name of a register (for example, Memory Configura-
tion Register) is spelled out only at the top of the register description
page, or when the register is first introduced.
• Bits and fields are enclosed in angle brackets. For example, bit <31>
and bits <31:16>. For clarity of reference, bits are usually specified by
their numbers or names enclosed in angle brackets adjacent to the reg-
ister mnemonic, such as TLBER<16> or TLBER<UDE>, which are
equivalent designations.