376 datasheet(69/95 Pages) INTEL

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376 EMBEDDED PROCESSOR

65 Designing for the ICETM-376

Emulator

The 376 embedded processor in-circuit emulator

product is the ICE-376 emulator Use of the emula-

tor requires the target system to provide a socket

that is compatible with the ICE-376 emulator The

80376 offers two different probes for emulating user

systems an 88-pin PGA probe and a 100-pin fine

pitch flat-pack probe The 100-pin fine pitch flat-

pack probe requires a socket called the 100-pin

PQFP which is available from 3-M Textool (part

number 2-0100-07243-000) The ICE-376 emulator

probe attaches to the target system via an adapter

which replaces the 80376 component in the target

system Because of the high operating frequency of

80376 systems and of the ICE-376 emulator there is

no buffering between the 80376 emulation proces-

sor in the ICE-376 emulator probe and the target

system A direct result of the non-buffered intercon-

nect is that the ICE-376 emulator shares the ad-

dress and data bus with the user’s system and the

RESET signal is intercepted by the ICE emulator

hardware In order for the ICE-376 emulator to be

functional in the user’s system without the Optional

Isolation Board (OIB) the designer must be aware of

the following conditions

1 The bus controller must only enable data trans-

ceivers onto the data bus during valid read cycles

of the 80376 other local devices or other bus

masters

2 Before another bus master drives the local proc-

essor address bus the other master must gain

control of the address bus by asserting HOLD and

receiving the HLDA response

3 The emulation processor receives the RESET sig-

nal 2 or 4 CLK2 cycles later than an 80376 would

and responds to RESET later Correct phase of

the response is guaranteed

In addition to the above considerations the ICE-376

emulator processor module has several electrical

and mechanical characteristics that should be taken

into consideration when designing the 80376 sys-

tem

Capacitive Loading

ICE-376 adds up to 27 pF to

each 80376 signal

Drive Requirements

ICE-376 adds one FAST TTL

load on the CLK2 control address and data lines

These loads are within the processor module and

are driven by the 80376 emulation processor which

has standard drive and loading capability listed in

Tables 63 and 64

Power Requirements

For noise immunity and

CMOS latch-up protection the ICE-376 emulator

processor module is powered by the user system

The circuitry on the processor module draws up to

14A including the maximum 80376 ICC from the

user 80376 socket

80376 Location and Orientation

The ICE-376 em-

ulator processor module may require lateral clear-

ance Figure 612 shows the clearance requirements

of the iMP adapter and Figure 613 shows the clear-

ance requirements of the 88-pin PGA adapter The

240182 – 46

Figure 612 Preliminary ICETM-376 Emulator User Cable with PQFP Adapter

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