AD73411 datasheet(30/36 Pages) AD

30 / 36 page

REV. 0

AD73411

–30–

of setting the value of the mode pins, the effects of an emulator

reset must be taken into consideration.

One method of ensuring that the values located on the mode

pins are those desired, is to construct a circuit like the one shown

in Figure 20. This circuit forces the value located on the Mode

A pin to logic high; regardless if it is latched via the

RESET or

ERESET pin.

ERESET

RESET

AD73411

MODE A/PFO

PROGRAMMABLE

I/O

Figure 20. Mode A Pin/EZ-ICE Circuit

The ICE-Port interface consists of the following AD73411 pins:

EBR

EBG

ERESET

EMS

EINT

ECLK

ELIN

ELOUT

These AD73411 pins must be connected only to the EZ-ICE

connector in the target system. These pins have no function

except during emulation, and do not require pull-up or pull-

down resistors. The traces for these signals between the AD73411

and the connector must be kept as short as possible, no longer

than three inches.

The following pins are also used by the EZ-ICE:

RESET

GND

The EZ-ICE uses the EE (emulator enable) signal to take control

of the AD73411 in the target system. This causes the processor

to use its

ERESET, EBR, and EBG pins instead of the RESET,

BR, and BG pins. The BG output is three-stated. These signals do

not need to be jumper-isolated in your system.

The EZ-ICE connects to your target system via a ribbon cable

and a 14-pin female plug. The ribbon cable is 10 inches in length

with one end ﬁxed to the EZ-ICE. The female plug is plugged

onto the 14-pin connector (a pin strip header) on the target board.

Target Board Connector for EZ-ICE Probe

The EZ-ICE connector (a standard pin strip header) is shown

in Figure 21. You must add this connector to your target board

design if you intend to use the EZ-ICE. Be sure to allow enough

room in your system to ﬁt the EZ-ICE probe onto the 14-pin

connector.

The 14-pin, 2-row pin strip header is keyed at the Pin 7 loca-

tion—you must remove Pin 7 from the header. The pins must

be 0.025 inch square and at least 0.20 inch in length. Pin spac-

ing should be 0.1

× 0.1 inches. The pin strip header must have

at least 0.15 inch clearance on all sides to accept the EZ-ICE

probe plug.

Pin strip headers are available from vendors such as 3M,

McKenzie, and Samtec.

GND

KEY (NO PIN)

RESET

TOP VIEW

EBG

EBR

ELOUT

EINT

ELIN

ECLK

EMS

ERESET

Figure 21. Target Board Connector for EZ-ICE

Target Memory Interface

For your target system to be compatible with the EZ-ICE

emulator, it must comply with the memory interface guidelines

listed below.

PM, DM, BM, IOM and CM

Design your Program Memory (PM), Data Memory (DM),

Byte Memory (BM), I/O Memory (IOM) and Composite

Memory (CM) external interfaces to comply with worst-case

device timing requirements and switching characteristics as speci-

ﬁed in the DSP’s data sheet. The performance of the EZ-ICE

may approach published worst case speciﬁcation for some memory

access timing requirements and switching characteristics.

Note: If your target does not meet the worst-case chip speciﬁca-

tion for memory access parameters, you may not be able to

emulate your circuitry at the desired CLKIN frequency. Depend-

ing on the severity of the speciﬁcation violation, you may have

trouble manufacturing your system as DSP components statisti-

cally vary in switching characteristic and timing requirements

within published limits.

Restriction: All memory strobe signals on the AD73411 (

RD,

WR, PMS, DMS, BMS, CMS, and IOMS) used in your target

system must have 10 k

Ω pull-up resistors connected when the

EZ-ICE is being used. The pull-up resistors are necessary because

there are no internal pull-ups to guarantee their state during

prolonged three-state conditions resulting from typical EZ-ICE

debugging sessions. These resistors may be removed at your

option when the EZ-ICE is not being used.

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