D950-CORE datasheet(83/89 Pages) STMICROELECTRONICS

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D950-Core

7.5

Emulation and Test Unit (EMU)

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

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.

TAP

CORE

Instr.

Reg.

out.

mux

EMU

TAP

D950

NTRST

TMS

TCK

TDI

TDO

NERQ

AI,X,YEBP

TI_CORE

TO_CORE

UPDATE_DR

BUS + CTRL

FNOP,INCYCLE,LPACK

HALTACK,MCI

HALT

SNAP IDLE

CLK_EMU

TEST_D950

EMU_D950

TEST

EMI

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