Section 9.2 Pll Components; Phase Detector And Charge Pump Loop Filter - Motorola DSP56000 Manual

24-bit digital signal processor
Hide thumbs Also See for DSP56000:
Table of Contents

Advertisement

PERIPHERAL
MODULES
24-Bit
56K Mod-
INTERNAL
DATA
BUS
SWITCH
PLL
PROGRAM
INTERRUPT
CLOCK
CONTROLLER
GENERATOR
9.2.1

Phase Detector and Charge Pump Loop Filter

The Phase Detector (PD) detects any phase difference between the external clock
(EXTAL) and an internal clock phase from the frequency multiplier. At the point where
there is negligible phase difference and the frequency of the two inputs is identical, the
PLL is in the "locked" state.
9 - 4
PLL COMPONENTS
PROGRAM
RAM/ROM
EXPANSION
YAB
ADDRESS
XAB
GENERATION
PAB
UNIT
YDB
XDB
PDB
GDB
PROGRAM
PROGRAM
DECODE
ADDRESS
GENERA TOR
CONTROLLER
Program Control Unit
MODC/NMI
MODB/IRQB
MODA/IRQA
RESET
Figure 9-2 DSP56K Block Diagram
PLL CLOCK OSCILLATOR
X MEMORY
Y MEMORY
RAM/ROM
RAM/ROM
EXPANSION
EXPANSION
DATA ALU
24X24 + 56 → 56-BIT MAC
TWO 56-BIT ACCUMULATORS
EXPANSION
AREA
EXTERNAL
ADDRESS
BUS
SWITCH
BUS
CONTROL
EXTERNAL
DATA BUS
SWITCH
OnCE™
16 BITS
24 BITS
MOTOROLA

Advertisement

Table of Contents
loading

This manual is also suitable for:

Dsp56k

Table of Contents