D950CORE View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

D950CORE

16-Bit Fixed Point Digital Signal Processor (DSP) Core

STMicroelectronics 

7.5 Emulation and Test Unit (EMU)

D950-Core

7.5.1 Introduction

The D950-Core EMU is a peripheral which performs functions dedicated to emulation and test

through the external IEEE 1149.1 JTAG interface.

The emulation and test operations are controlled by an off-core Test Access Port (TAP) and

an off-core emulator by means of dedicated control I/Os.

Figure 7.6 D950-Core Emulation and Test

NERQ AI,X,YEBP

CLK_EMU

SNAP IDLE

NTRST

TMS

TCK

TAP

TAP

CORE

Instr.

Reg.

EMU

D950

EMU_D950

HALT

HALTACK,MCI

FNOP,INCYCLE,LPACK

BUS + CTRL

out.

mux

TDO

TDI

TEST_D950

UPDATE_DR

TO_CORE

TI_CORE

TEST

EMI

Emulation mode can entered in two ways:

• Asserting ERQ input pin low.

• Meeting a valid breakpoint condition or executing an instruction in single step

mode.

Most of D950-Core instructions can be executed in emulation mode, including arithmetic/logic,

JUMP/CALL and MOVE. These instructions are used to display the processor status

(memories and registers) and restore the context.

Exiting the emulation mode is controlled by the PC-board emulator through the JTAG

interface.

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