ADSP2185 datasheet(12/32 Pages) AD

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ADSP-2185

–12–

REV. 0

Target Board Connector for EZ-ICE

®* Probe

The EZ-ICE

®* connector (a standard pin strip header) is shown

in Figure 7. 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.

910

GND

KEY (NO PIN)

RESET

TOP VIEW

EBG

EBR

ELOUT

EINT

ELIN

ECLK

EMS

ERESET

Figure 7. Target Board Connector for EZ-ICE®*

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.

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 tim-

ing requirements and switching characteristics as specified in

this 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 ADSP-2185 (

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.

Target System Interface Signals

When the EZ-ICE

®* board is installed, the performance on

some system signals change. Design your system to be compat-

ible with the following system interface signal changes intro-

duced by the EZ-ICE

®* board:

• EZ-ICE

®* emulation introduces an 8 ns propagation delay

between your target circuitry and the DSP on the

RESET

signal.

• EZ-ICE

®* emulation introduces an 8 ns propagation delay

between your target circuitry and the DSP on the

BR signal.

• EZ-ICE

®* emulation ignores

RESET and BR when single-

stepping.

• EZ-ICE

®* emulation ignores

RESET and BR when in Emu-

lator Space (DSP halted).

• EZ-ICE

®* emulation ignores the state of target

BR in certain

modes. As a result, the target system may take control of the

DSP’s external memory bus only if bus grant (

BG) is asserted

by the EZ-ICE

®* board’s DSP.

ADSP2185 Datasheet(PDF) 12 Page - Analog Devices

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