
DSP56321 Technical Data, Rev. 11
Freescale Semiconductor
iii
Features
Table 1
 lists the features of the DSP56321 device.
Table 1.   
DSP56321 Features 
Feature
Description
High-Performance 
DSP56300 Core
 275 million multiply-accumulates per second (MMACS) (550 MMACS using the EFCOP in filtering 
applications) with a 275 MHz clock at 1.6 V core and 3.3 V I/O
 Object code compatible with the DSP56000 core with highly parallel instruction set
 Data arithmetic logic unit (Data ALU) with fully pipelined 24 
×
  24-bit parallel Multiplier-Accumulator (MAC), 
56-bit parallel barrel shifter (fast shift and normalization; bit stream generation and parsing), conditional 
ALU instructions, and 24-bit or 16-bit arithmetic support under software control
 Program control unit (PCU) with position independent code (PIC) support, addressing modes optimized for 
DSP applications (including immediate offsets), internal instruction cache controller, internal memory-
expandable hardware stack, nested hardware DO loops, and fast auto-return interrupts
 Direct memory access (DMA) with six DMA channels supporting internal and external accesses; one-, two-
, and three-dimensional transfers (including circular buffering); end-of-block-transfer interrupts; and 
triggering from interrupt lines and all peripherals
 Phase-lock loop (PLL) allows change of low-power divide factor (DF) without loss of lock and output clock 
with skew elimination
 Hardware debugging support including on-chip emulation (OnCE) module, Joint Test Action Group (JTAG) 
test access port (TAP)
 Internal 24 
×
 24-bit filtering and echo-cancellation coprocessor that runs in parallel to the DSP core
 Operation at the same frequency as the core (up to 275 MHz)
 Support for a variety of filter modes, some of which are optimized for cellular base station applications:
 Real finite impulse response (FIR) with real taps
 Complex FIR with complex taps
 Complex FIR generating pure real or pure imaginary outputs alternately
 A 4-bit decimation factor in FIR filters, thus providing a decimation ratio up to 16
 Direct form 1 (DFI) Infinite Impulse Response (IIR) filter
 Direct form 2 (DFII) IIR filter
 Four scaling factors (1, 4, 8, 16) for IIR output
 Adaptive FIR filter with true least mean square (LMS) coefficient updates
 Adaptive FIR filter with delayed LMS coefficient updates
Enhanced Filter 
Coprocessor (EFCOP)
Internal Peripherals
 Enhanced 8-bit parallel host interface (HI08) supports a variety of buses (for example, ISA) and provides 
glueless connection to a number of industry-standard microcomputers, microprocessors, and DSPs
 Two enhanced synchronous serial interfaces (ESSI), each with one receiver and three transmitters (allows 
six-channel home theater)
 Serial communications interface (SCI) with baud rate generator 
 Triple timer module
 Up to 34 programmable general-purpose input/output (GPIO) pins, depending on which peripherals are 
enabled