I960 Datasheet, PDF (12/70 Pages) Intel Corporation – i960 RP/RD I/O PROCESSOR AT 3.3 VOLTS

i960^® Rx I/O Processor at 3.3 V
One of the boundary scan instructions, HIGHZ,
forces the processor to float all its output pins
(ONCE mode). ONCE mode can also be initiated at
reset without using the boundary scan mechanism.
ONCE mode is useful for board-level testing. This
feature allows a mounted 80960Rx to electrically
“remove” itself from a circuit board. This mode allows
system-level testing where a remote tester can
exercise the processor system.
The test logic does not interfere with component or
system behavior and ensures that components
function correctly, and also the connections between
various components are correct.
The JTAG Boundary Scan feature is an alternative
to conventional “bed-of-nails” testing. It can examine
connections that might otherwise be inaccessible to
a test system.
• Five Register Indirect modes
• Index with displacement mode
• IP with displacement mode
Table 2 shows the available instructions.
2.2.8 Memory-Mapped Control Registers
The 80960Rx is compliant with 80960 family archi-
tecture and has the added advantage of memory-
mapped, internal control registers not found on the
80960Kx, Sx or Cx processors. This feature provides
software an interface to easily read and modify
internal control registers.
Each memory-mapped, 32-bit register is accessed
via regular memory-format instructions. The
processor ensures that these accesses do not
generate external bus cycles.
2.2.9 Instructions, Data Types and Memory
Addressing Modes
As with all 80960 family processors, the 80960Rx
instruction set supports several different data types
and formats:
• Bit
• Bit fields
• Integer (8-, 16-, 32-, 64-bit)
• Ordinal (8-, 16-, 32-, 64-bit unsigned integers)
• Triple word (96 bits)
• Quad word (128 bits)
The 80960Rx provides a full set of addressing
modes for C and assembly:
• Two Absolute modes
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ADVANCE INFORMATION