80960JD datasheet(8/61 Pages) INTEL

8 / 61 page

80960JD

PRELIMINARY

natively, mark and fmark instructions can generate

trace events explicitly in the instruction stream.

Hardware breakpoint registers are also available to

trap on execution and data addresses.

2.7

Low Power Operation

Intel fabricates the 80960Jx using an advanced sub-

micron manufacturing process. The processor’s sub-

micron topology provides the circuit density for

optimal cache size and high operating speeds while

dissipating modest power. The processor also uses

dynamic power management to turn off clocks to

unused circuits.

Users may program the 80960Jx to enter Halt mode

for maximum power savings. In Halt mode, the

processor core stops completely while the integrated

peripherals continue to function, reducing overall

power requirements up to 90 percent. Processor

execution resumes from internally or externally

generated interrupts.

2.8

Test Features

The 80960Jx incorporates numerous features which

enhance the user’s ability to test both the processor

and the system to which it is attached. These

features include ONCE (On-Circuit Emulation) mode

and Boundary Scan (JTAG).

The 80960Jx provides testability features compatible

with IEEE Standard Test Access Port and Boundary

Scan Architecture (IEEE Std. 1149.1).

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 80960JD to electrically

“remove” itself from a circuit board. This allows for

system-level testing where a remote tester — such

as an in-circuit emulator — can exercise the

processor system.

The provided test logic does not interfere with

component or circuit board behavior and ensures

that components function correctly, connections

between various components are correct, and

various components interact correctly on the printed

circuit board.

The JTAG Boundary Scan feature is an attractive

alternative to conventional “bed-of-nails” testing. It

can examine connections which might otherwise be

inaccessible to a test system.

2.9

Memory-Mapped Control

Registers

The 80960JD, though compliant with i960 series

processor

core,

has

the

added

advantage

memory-mapped, internal control registers not found

on the i960 Kx, Sx or Cx processors. These give

software the interface to easily read and modify

internal control registers.

Each of these registers is accessed as a memory-

mapped, 32-bit register. Access is accomplished

through regular memory-format instructions. The

processor ensures that these accesses do not

generate external bus cycles.

2.10

Data Types and Memory

Addressing Modes

As with all i960 family processors, the 80960Jx

instruction set supports several 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 80960Jx provides a full set of addressing modes

for C and assembly programming:

• Two Absolute modes

• Five Register Indirect modes

• Index with displacement

• IP with displacement

80960JD Datasheet(PDF) 8 Page - Intel Corporation

80960JD Datasheet(HTML) 8 Page - Intel Corporation

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