ad73411 Analog Devices, Inc., ad73411 Datasheet - Page 30

• Manufacturer Part Number: ad73411
• Description: Low-power Analog Front End With Dsp Microcomputer
• Manufacturer: Analog Devices, Inc.

AD73411
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.
The ICE-Port interface consists of the following AD73411 pins:
EBR
EMS
ELIN
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:
BR
RESET
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-
EBG
EINT
ELOUT
BG
GND
ERESET
ECLK
EE
1k
PROGRAMMABLE
I/O
ERESET
RESET
MODE A/PFO
AD73411
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 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 kΩ 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.
KEY (NO PIN)
RESET
ELOUT
GND
EBR
EBG
EE
11
13
1
3
5
7
9
TOP VIEW
12
14
10
2
4
6
8
BG
EINT
ERESET
BR
ELIN
EMS
ECLK