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Programming Model
Term
READI signals
Refers to IEEE-ISTO 5001 auxiliary port.
RPM
Reduced Port Mode. This is the reduced port mode for READI.
run-time
RCPU is executing program code in normal mode
Sequential Instruction
Any instruction other than a flow-control instruction or isync.
Snooping
Monitoring addresses driven by a bus master to detect the need for coherency actions.
Standard
The phrase "according to the standard" implies according the IEEE-ISTO 5001 - 1999.
Superfield
One or more message "fields" delimited by MSEO/MSEI assertion/negation.
The information transmitted between "start-message" and "end-packet" states.
Show Cycle
An internal access (e.g., to an internal memory) reflected on the external bus using a
special cycle (marked with a dedicated transfer code). For an internal memory "hit," an
address-only bus cycle is generated; for an internal memory "miss," a complete bus cycle is
generated.
Transfer Code (TCODE) Message header that identifies the number and/or size of packets to be transferred, and how
to interpret each of the packets.
Upload
Device sends information to the tool.
VSYNC
Internal RCPU signal
VF
Internal RCPU signal which indicates instruction queue status.
VFLS
Internal RCPU signal which indicates history buffer flush status.
22.1 Programming Model
This section describes the READI programmer's model. READI resources can only be
configured and accessed via the auxiliary port.
The READI registers do not follow the recommendations of the IEEE-ISTO 5001-1999,
but are loosely based on the 0.9 release of the standard.
22.1.1
Register Map
READI registers are accessible via the auxiliary port. They can be classified into two
categories: user-mapped registers and tool-mapped registers.
22.1.1.1 User-Mapped Register (OTR)
The operating system writes the ID for the current task/process in the single user-mapped
register, the READI ownership trace (OTR) register. Table 22-4 shows the location of the
register bits. Their functions are explained below.
The current task/process (CTP) field is updated by the operating system software to provide
task/process ID information. The OTR register can only be accessed by supervisor data
22-8
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Table 22-3. Terms and Definitions (continued)
MPC533 Reference Manual
Description
MOTOROLA
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