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参数资料
| 型号： | ADMC331-PB |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Single Chip DSP Motor Controller |
| 中文描述： | 单芯片DSP的电机控制器 |
| 文件页数： | 8/36页 |
| 文件大小： | 248K |
| 代理商： | ADMC331-PB |
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ADMC331
–8–
REV. B
BUS
EXCHANGE
DATA
ADDRESS
GENERATOR
#2
DATA
ADDRESS
GENERATOR
#1
14
14
24
16
6
R BUS
16
COMPANDING
CIRCUITRY
DMA BUS
PMA BUS
DMD BUS
PMD BUS
PROGRAM
SEQUENCER
INSTRUCTION
REGISTER
INPUT REGS
OUTPUT REGS
SHIFTER
INPUT REGS
OUTPUT REGS
MAC
INPUT REGS
OUTPUT REGS
ALU
SERIAL
PORT 0
RECEIVE REG
TRANSMIT REG
CONTROL
LOGIC
DM RAM
1K 16
PM ROM
2K 24
PM RAM
2K 24
SERIAL
PORT 1
RECEIVE REG
TRANSMIT REG
5
TIMER
Figure 3. DSP Core Block Diagram
DSP CORE ARCHITECTURE OVERVIEW
Figure 3 is an overall block diagram of the DSP core of the
ADMC331, which is based on the fixed-point ADSP-2171. The
flexible architecture and comprehensive instruction set of the
ADSP-2171 allows the processor to perform multiple operations
in parallel. In one processor cycle (38.5 ns with a 13 MHz
CLKIN) the DSP core can:
Generate the next program address.
Fetch the next instruction.
Perform one or two data moves.
Update one or two data address pointers.
Perform a computational operation.
This all takes place while the processor continues to:
Receive and transmit through the serial ports.
Decrement the interval timer.
Generate three-phase PWM waveforms for a power inverter.
Generate two signals using the 8-bit auxiliary PWM timers.
Acquire four analog signals.
Decrement the watchdog timer.
The processor contains three independent computational units:
the arithmetic and logic unit (ALU), the multiplier/accumulator
(MAC) and the shifter. The computational units process 16-bit
data directly and have provisions to support multiprecision com-
putations. The ALU performs a standard set of arithmetic and
logic operations; division primitives are also supported. The
MAC performs single-cycle multiply, multiply/add, multiply/
subtract operations with 40 bits of accumulation. The shifter
performs logical and arithmetic shifts, normalization, denormalization
and derive exponent operations. The shifter can be used to effi-
ciently implement numeric format control including floating-
point representations.
The internal result (R) bus directly connects the computational
units so that the output of any unit may be the input of any unit
on the next cycle.
A powerful program sequencer and two dedicated data address
generators ensure efficient delivery of operands to these computa-
tional units. The sequencer supports conditional jumps and
subroutine calls and returns in a single cycle. With internal loop
counters and loop stacks, the ADMC331 executes looped code
with zero overhead; no explicit jump instructions are required
to maintain the loop.
Two data address generators (DAGs) provide addresses for
simultaneous dual operand fetches from data memory and
program memory. Each DAG maintains and updates four ad-
dress pointers (I registers). Whenever the pointer is used to
access data (indirect addressing), it is post-modified by the
value in one of four modify (M registers). A length value may
be associated with each pointer (L registers) to implement auto-
matic modulo addressing for circular buffers. The circular buff-
ering feature is also used by the serial ports for automatic data
transfers to and from on-chip memory. DAG1 generates only
data memory address but provides an optional bit-reversal
capability. DAG2 may generate either program or data memory
addresses, but has no bit-reversal capability.
Efficient data transfer is achieved with the use of five internal
buses:
Program Memory Address (PMA) Bus
Program Memory Data (PMD) Bus
Data Memory Address (DMA) Bus
Data Memory Data (DMD) Bus
Result (R) Bus
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