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ADSP-2184

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In addition to the programmable flags, the ADSP-2184 has five

fixed-mode flags, FLAG_IN, FLAG_OUT, FL0, FL1 and

FL2. FL0-FL2 are dedicated output flags. FLAG_IN and

FLAG_OUT are available as an alternate configuration of

SPORT1.

Note: Pins PF0, PF1 and PF2 are also used for device configu-

ration during reset.

INSTRUCTION SET DESCRIPTION

The ADSP-2184 assembly language instruction set has an alge-

braic syntax that was designed for ease of coding and readabil-

ity. The assembly language, which takes full advantage of the

processor’s unique architecture, offers the following benefits:

• The algebraic syntax eliminates the need to remember cryptic

assembler mnemonics. For example, a typical arithmetic add

instruction, such as AR = AX0 + AY0, resembles a simple

equation.

• Every instruction assembles into a single, 24-bit word that

can execute in a single instruction cycle.

• The syntax is a superset ADSP-2100 Family assembly lan-

guage and is completely source and object code compatible

with other family members. Programs may need to be relo-

cated to utilize on-chip memory and conform to the ADSP-

2184’s interrupt vector and reset vector map.

• Sixteen condition codes are available. For conditional jump,

call, return or arithmetic instructions, the condition can be

checked and the operation executed in the same instruction

cycle.

• Multifunction instructions allow parallel execution of an

arithmetic instruction with up to two fetches or one write to

processor memory space during a single instruction cycle.

DESIGNING AN EZ-ICE-COMPATIBLE SYSTEM

The ADSP-2184 has on-chip emulation support and an

ICE-Port, a special set of pins that interface to the EZ-ICE. These

features allow in-circuit emulation without replacing the target

system processor by using only a 14-pin connection from the

target system to the EZ-ICE. Target systems must have a 14-pin

connector to accept the EZ-ICE’s in-circuit probe, a 14-pin plug.

Issuing the chip reset command during emulation causes the

DSP to perform a full chip reset, including a reset of its memory

mode. Therefore, it is vital that the mode pins are set correctly

PRIOR to issuing a chip reset command from the emulator user

interface.

If using a passive method of maintaining mode information (as

discussed in Setting Memory Modes), it does not matter that

the mode information is latched by an emulator reset. However,

if using the

RESET pin as a method 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 is the one that is desired to construct a circuit like the one

shown in Figure 7. This circuit will force the value located on

the Mode A pin to Logic Low, regardless if it latched via the

RESET or ERESET pin.

PROGRAMMABLE I/O

MODE A/PFO

RESET

ERESET

ADSP-2184

Figure 7.

See the ADSP-2100 Family EZ-Tools data sheet for complete

information on ICE products.

The ICE-Port interface consists of the following ADSP-2184

pins:

EBR

EBG

ERESET

EMS

EINT

ECLK

ELIN

ELOUT

These ADSP-2184 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

ADSP-2184 and the connector must be kept as short as pos-

sible, 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 con-

trol of the ADSP-2184 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 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 8. 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.

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