P R E L I M I N A R Y
Z89462
CP95DSP0400
P
RELIMINARY
C
USTOMER
P
ROCUREMENT
S
PECIFICATION
Z89462
16-B
IT
, F
IXED
-P
OINT
D
IGITAL
S
IGNAL
P
ROCESSOR
FEATURES
Part
Z89462
s
s
s
Prog. RAM
(K Words)
1
Prog./Data Data RAM
(K Words)
(Words)
64
512
Speed
(MHz)
20, 40
s
s
s
Enhanced Instruction Set
Single-Cycle Instruction Execution
Four-Stage Pipeline
100-Pin QFP and 124-Pin PGA Packages
0擄C to +70擄C Temperature Range
3.3- to 5.0-Volt Operating Range
40 MHz Operation @ 5.0V
20 MHz Operation @ 3.3V
Six RAM Pointers for 4K-Word RAM Banks
Three Maskable Vectored Interrupts, Edge or Level
Trigger Selectable
On-Board Peripherals
s
s
s
s
Dual 8/16-Bit CODEC Interface
Wait-State Generator
Two 16-Bit Timer/Counters
Dynamic Program Bus Sizing
s
s
GENERAL DESCRIPTION
The Z89462 is a high-performance Digital Signal Processor
(DSP) optimized for processing and transferring data. This
enhanced processor provides an upward migration path
for its Z89C00/Z89321 predecessors.
The DSP provides three 12-bit Register Pointers for each
RAM bank. These pointers may be incremented or
decremented automatically to implement circular buffers
without software overhead.
Three prioritized and individually maskable interrupts are
provided for use by external peripherals requiring service
from the DSP. The interrupt inputs can be individually
conditioned for edge or level trigger. Acknowledgement of
an activated interrupt occurs at the end of an instruction
execution.
Two banks of 512 x 16-bit data RAM are available.
Expansion of the on-chip data RAM is provided through
future upgrades.
External interfaces include Address Bus and Data Bus for
external Program Memory, Address Bus and Data Bus for
external Data Memory, three vectored interrupt ports, and
two input/two output user ports.
Notes:
All Signals with a preceding front slash, "/", are active Low, e.g.,
B//W (WORD is active Low); /B/W (BYTE is active Low, only).
Power connections follow conventional descriptions below:
Connection
Power
Ground
Circuit
V
CC
GND
Device
V
DD
V
SS
CP95DSP0400 (8/95)
1
1
2
3
4
5
6
7
8
