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ADSP-2185BST-115 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADSP-2185BST-115
Beschreibung DSP Microcomputer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
ADSP-2185BST-115 Datasheet, Funktion
a
DSP Microcomputer
ADSP-2185
FEATURES
PERFORMANCE
30 ns Instruction Cycle Time 33 MIPS Sustained
Performance
Single-Cycle Instruction Execution
Single-Cycle Context Switch
3-Bus Architecture Allows Dual Operand Fetches in
Every Instruction Cycle
Multifunction Instructions
Power-Down Mode Featuring Low CMOS Standby
Power Dissipation with 100 Cycle Recovery from
Power-Down Condition
Low Power Dissipation in Idle Mode
INTEGRATION
ADSP-2100 Family Code Compatible, with Instruction
Set Extensions
80K Bytes of On-Chip RAM, Configured as
16K Words On-Chip Program Memory RAM and
16K Words On-Chip Data Memory RAM
Dual Purpose Program Memory for Both Instruction
and Data Storage
Independent ALU, Multiplier/Accumulator and Barrel
Shifter Computational Units
Two Independent Data Address Generators
Powerful Program Sequencer Provides
Zero Overhead Looping Conditional Instruction
Execution
Programmable 16-Bit Interval Timer with Prescaler
100-Lead TQFP
SYSTEM INTERFACE
16-Bit Internal DMA Port for High Speed Access to
On-Chip Memory (Mode Selectable)
4 MByte Byte Memory Interface for Storage of Data
Tables & Program Overlays
8-Bit DMA to Byte Memory for Transparent Program
and Data Memory Transfers (Mode Selectable)
I/O Memory Interface with 2048 Locations Supports
Parallel Peripherals (Mode Selectable)
Programmable Memory Strobe & Separate I/O Memory
Space Permits “Glueless” System Design
(Mode Selectable)
Programmable Wait State Generation
Two Double-Buffered Serial Ports with Companding
Hardware and Automatic Data Buffering
Automatic Booting of On-Chip Program Memory from
Byte-Wide External Memory, e.g., EPROM, or
Through Internal DMA Port
*ICE-Port is a trademark of Analog Devices, Inc.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FUNCTIONAL BLOCK DIAGRAM
DATA ADDRESS
GENERATORS
DAG 1 DAG 2
PROGRAM
SEQUENCER
POWER-DOWN
CONTROL
MEMORY
16k ؋ 24
PROGRAM
MEMORY
16k ؋ 16
DATA
MEMORY
PROGRAM MEMORY ADDRESS
DATA MEMORY ADDRESS
PROGRAM MEMORY DATA
DATA MEMORY DATA
ARITHMETIC UNITS
ALU MAC SHIFTER
ADSP-2100 BASE
ARCHITECTURE
SERIAL PORTS
SPORT 0 SPORT 1
PROGRAMMABLE
I/O
AND
FLAGS
FULL MEMORY
MODE
EXTERNAL
ADDRESS
BUS
EXTERNAL
DATA
BUS
BYTE DMA
CONTROLLER
TIMER
OR
EXTERNAL
DATA
BUS
INTERNAL
DMA
PORT
HOST MODE
Six External Interrupts
13 Programmable Flag Pins Provide Flexible System
Signaling
UART Emulation through Software SPORT Reconfiguration
ICE-Port™* Emulator Interface Supports Debugging
in Final Systems
GENERAL NOTE
This data sheet represents production grade specifications for
the ADSP-2185 (5 V).
GENERAL DESCRIPTION
The ADSP-2185 is a single-chip microcomputer optimized for
digital signal processing (DSP) and other high speed numeric
processing applications.
The ADSP-2185 combines the ADSP-2100 family base archi-
tecture (three computational units, data address generators and
a program sequencer) with two serial ports, a 16-bit internal
DMA port, a byte DMA port, a programmable timer, Flag I/O,
extensive interrupt capabilities and on-chip program and data
memory.
The ADSP-2185 integrates 80K bytes of on-chip memory con-
figured as 16K words (24-bit) of program RAM and 16K words
(16-bit) of data RAM. Power-down circuitry is also provided to
meet the low power needs of battery operated portable equip-
ment. The ADSP-2185 is available in 100-pin TQFP package.
In addition, the ADSP-2185 supports new instructions, which
include bit manipulations—bit set, bit clear, bit toggle, bit test—
new ALU constants, new multiplication instruction (x squared),
biased rounding, result free ALU operations, I/O memory trans-
fers and global interrupt masking, for increased flexibility.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997






ADSP-2185BST-115 Datasheet, Funktion
ADSP-2185
Idle
When the ADSP-2185 is in the Idle Mode, the processor waits
indefinitely in a low power state until an interrupt occurs. When
an unmasked interrupt occurs, it is serviced; execution then
continues with the instruction following the IDLE instruction.
In Idle mode IDMA, BDMA and autobuffer cycle steals still
occur.
Slow Idle
The IDLE instruction is enhanced on the ADSP-2185 to let the
processor’s internal clock signal be slowed, further reducing
power consumption. The reduced clock frequency, a program-
mable fraction of the normal clock rate, is specified by a select-
able divisor given in the IDLE instruction. The format of the
instruction is
IDLE (n);
where n = 16, 32, 64 or 128. This instruction keeps the proces-
sor fully functional, but operating at the slower clock rate. While
it is in this state, the processor’s other internal clock signals,
such as SCLK, CLKOUT and timer clock, are reduced by the
same ratio. The default form of the instruction, when no clock
divisor is given, is the standard IDLE instruction.
When the IDLE (n) instruction is used, it effectively slows down
the processor’s internal clock and thus its response time to in-
coming interrupts. The one-cycle response time of the standard
idle state is increased by n, the clock divisor. When an enabled
interrupt is received, the ADSP-2185 will remain in the idle
state for up to a maximum of n processor cycles (n = 16, 32, 64
or 128) before resuming normal operation.
When the IDLE (n) instruction is used in systems that have an
externally generated serial clock (SCLK), the serial clock rate
may be faster than the processor’s reduced internal clock rate.
Under these conditions, interrupts must not be generated at a
faster rate than can be serviced, due to the additional time the
processor takes to come out of the idle state (a maximum of n
processor cycles).
SYSTEM INTERFACE
Figure 2 shows typical basic system configurations with the
ADSP-2185, two serial devices, a byte-wide EPROM and optional
external program and data overlay memories (mode selectable).
Programmable wait state generation allows the processor to
easily connect to slow peripheral devices. The ADSP-2185 also
provides four external interrupts and two serial ports or six
external interrupts and one serial port.
Host Memory mode allows access to the full external data bus,
but limits addressing to a single address bit (A0). Additional
system peripherals can be added in this mode through the use of
external hardware to generate and latch address signals.
1/2x CLOCK
OR
CRYSTAL
SERIAL
DEVICE
SERIAL
DEVICE
HOST MEMORY MODE
ADSP-2185
CLKIN
XTAL
ADDR13-0
14
FL0-2
PF3
IRQ2/PF7
IRQE/PF4
IRQL0/PF5
IRQL1/PF6
DATA23-0
24
BMS
MODE C/PF2
MODE B/PF1
MODE A/PF0
IOMS
SPORT1
SCLK1
RFS1 OR IRQ0
TFS1 OR IRQ1
DT1 OR FO
DR1 OR FI
SPORT0
SCLK0
RFS0
TFS0
DT0
DR0
PMS
DMS
CMS
BR
BG
BGH
PWD
PWDACK
1/2x CLOCK
OR
CRYSTAL
SERIAL
DEVICE
SERIAL
DEVICE
SYSTEM
INTERFACE
OR
µCONTROLLER
16
HOST MEMORY MODE
ADSP-2185
CLKIN
XTAL
A0
FL0-2
PF3
IRQ2/PF7
IRQE/PF4
IRQL0/PF5
IRQL1/PF6
DATA23-0
BMS
1
16
MODE C/PF2
MODE B/PF1
MODE A/PF0
SPORT1
SCLK1
RFS1 OR IRQ0
TFS1 OR IRQ1
DT1 OR FO
DR1 OR FI
IOMS
SPORT0
SCLK0
RFS0
TFS0
DT0
DR0
IDMA PORT
IRD/D6
IWR/D7
IS/D4
IAL/D5
IACK/D3
IAD15-0
PMS
DMS
CMS
BR
BG
BGH
PWD
PWDACK
A13-0
D23-16
D15-8
A0-A21
DATA
BYTE
MEMORY
A10-0
D23-8
A13-0
D23-0
CS
ADDR
DATA I/O SPACE
(PERIPHERALS)
CS 2048 LOCATIONS
ADDR OVERLAY
DATA MEMORY
TWO 8K
PM SEGMENTS
TWO 8K
DM SEGMENTS
Figure 2. Basic System Configuration
Clock Signals
The ADSP-2185 can be clocked by either a crystal or a TTL-
compatible clock signal.
The CLKIN input cannot be halted, changed during operation
or operated below the specified frequency during normal opera-
tion. The only exception is while the processor is in the power-
down state. For additional information, refer to Chapter 9,
ADSP-2100 Family User’s Manual, for detailed information on
this power-down feature.
If an external clock is used, it should be a TTL-compatible
signal running at half the instruction rate. The signal is con-
nected to the processor’s CLKIN input. When an external clock
is used, the XTAL input must be left unconnected.
–6– REV. 0

6 Page









ADSP-2185BST-115 pdf, datenblatt
ADSP-2185
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.
GND
EBG
EBR
KEY (NO PIN)
ELOUT
EE
RESET
1
3
5
7
×
9
11
13
2
BG
4
BR
6
EINT
8
ELIN
10
ECLK
12
EMS
14
ERESET
TOP VIEW
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 kpull-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.
–12–
REV. 0

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