ADSP-2185L datasheet(13/31 Pages) AD

13 / 31 page

ADSP-2185L

–13–

REV. A

Restriction:

All memory strobe signals on the ADSP-2185L

(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 changes. Design your system to be compatible

with the following system interface signal changes introduced by

the EZ-ICE board:

• EZ-ICE emulation introduces an 8 ns propagation delay be-

tween your target circuitry and the DSP on the RESET

signal.

• EZ-ICE emulation introduces an 8 ns propagation delay be-

tween 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 Emulator

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.

ADSP-2185L Datasheet(PDF) 13 Page - Analog Devices