ST18-AU1 STMICROELECTRONICS [STMicroelectronics], ST18-AU1 Datasheet - Page 58

• Manufacturer Part Number: ST18-AU1
• Description: SIX-CHANNEL DOLBY AC3/MPEG2 AUDIO DECODER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST18-AU1
16 D950Core
The D950Core is composed of three main units.
For full details of the D950 DSP core refer to the D950Core datasheet ( document number 42-
1709 ).
These units are organized in an HARVARD architecture around three bidirectional 16-bit
buses, two for data and one for instruction. Each of these buses is dedicated to an uni-
directional 16-bit address bus (XA/YA/IA).
An 8-bit general purpose parallel port (P0-P7) can be configured (input or output). A test
condition is attached to each bit to test external events.
The D950Core is controlled through interface pins related to interrupt, low-power mode, reset
and miscellaneous functions.
Figure 16.1
58/87
Data Calculation Unit (DCU)
Address Calculation Unit (ACU)
Program Control Unit (PCU)
D950Core block diagram
CONTROL
CALCULATION
CALCULATION
11
PROGRAM
CONTROL
ADDRESS
DATA
UNIT
UNIT
UNIT
PO/P7
8
Control
XA-bus
YA-bus
ID-bus
IA-bus
TEST & EMULATION
14
16
16
16
3
6
16
16
16