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ST18952 Datasheet(PDF) 10 Page - STMicroelectronics

Part # ST18952
Description  DIGITAL SIGNAL PROCESSOR DSP CHIP
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST18952 Datasheet(HTML) 10 Page - STMicroelectronics

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ST18952
D950Core
The D950Core is a general purpose programmable 16-bit fixed point Digital Signal Processor
Core. The main blocks of the D950Core include an arithmetic data calculation unit, a program
control unit and an address calculation unit, able to manage up to 64k (program) and 128k
(data) x 16-bit memory spaces.
Memory
One 32 Kword and two 8 Kword single port memories are included on-chip:
• 32 Kword instruction memory on I space
• 8 Kword X-Data memory on X space
• 8 Kword Y-Data memory on Y space
One 512 word dual port memory is shared on X and Y spaces.
Memory can be extended off-chip for all three spaces in two ways:
1: Directly - Accesses to program and data memories can be performed simulta-
neously. Insertion of wait-states is necessary in case of nominal frequency
work.
2: Through the bus switch unit - Accesses to the different external spaces are mul-
tiplexed and wait-states are added.
Bus switch unit
The bus switch unit (BSU) is a bi-directional switcher which switches the 3 internal buses (I, X
and Y) to the external (E) bus.
DMA controller
The DMA controller manages data transfer between memories and external peripherals.
There are four independent DMA channels. Transfers can occur on X/Y/I spaces
(simultaneous transfers on X and Y spaces).
Interrupt controller
The interrupt controller (ITC) can manage up to eight external interrupts. Each source can be
individually activated and programmed as edge or level triggered. A ‘pending interrupt’ flag
displays the source waiting for service (this flag is writable to allow a software interrupt
capability). The priority of interrupts is programmable.
Timers
There are two timer (TIM) units on the ST18952. The timers enable interrupts to be generated
after predefined periods of time.


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