ST18-AU1 STMICROELECTRONICS [STMicroelectronics], ST18-AU1 Datasheet - Page 15

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

ST18-AU1
Bus switch unit
The bus switch unit (BSU) is a bi-directional switcher. It switches the 3 internal buses (I, X and
Y) to the external (E) bus.
Clocks and timers unit
The clocks and timers unit provides all the necessary clocks and timer controls for DSP
processing, and all input/output operations. In addition, a 90 kHz System Time Clock (STC) is
provided to assist audio/video synchronization in systems which include a video decoder.
Emulation unit and JTAG IEEE 1149.1 test access port
The emulation unit (EMU) performs functions dedicated to emulation and test through the
external IEEE 1149.1 JTAG interface.
15/87