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Texas Instruments TMS320C64x DSP manual Operational Details, VIC Port Interface Signals

Models: TMS320C64x DSP

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Interface / Operational Details

6.2 Interface

The pin list for VIC port is shown in Table 6–1 (pins are 3.3V I/Os).

Table 6–1. VIC Port Interface Signals

VIC Port Signal

Direction

Description

VCTL

Output

VCXO control

STCLK

Input

System time clock

 

 

 

6.3 Operational Details

Synchronization is an important aspect of decoding and presenting data in real-time digital data delivery systems. This is addressed in the MPEG trans- port packets by transmitting timing information in the adaptation fields of selected data packets. This serves as a reference for timing comparison in the receiving system. A sample of the 27-MHz clock, the program clock reference (PCR) header is shown in Figure 6–2, is transmitted within the bit stream, which indicates the expected time at the completion of reading the field from the bit stream at the transport decoder. The sample is a 42-bit field, 9 bits cycle from 0 to 299 at 27 MHz, while the other 33-bit field is incremented by 1 each time the 9-bit field reaches a value of 299. The transport data packets are in sync with the server system clock.

Figure 6–2. Program Clock Reference (PCR) Header Format

47

15

14

9

8

0

PCR

 

Reserved

 

PCR extension

 

 

 

 

 

 

The video port in conjunction with the VIC port uses a combined hardware and software solution to synchronize the transport system time clock (STC) with the clock reference transmitted in the bitstream.

The video port maintains a hardware counter that counts the system time. The counter is driven by system time clock (STCLK) input driven by an external VCXO, controlled by the VIC port.

On reception of a packet, the video port captures a snapshot of the counter. Software uses this timestamp to determine the deviation of the system time clock from the server clock, and drives VCTL output of the VIC port to keep it synchronized.

SPRU629

VCXO Interpolated Control Port

6-3

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Texas Instruments TMS320C64x DSP manual Operational Details, VIC Port Interface Signals
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TMS320C64x DSP specifications

The TMS320C64x DSP family from Texas Instruments represents a significant milestone in the realm of digital signal processing. Launched as part of the C6000 series, the C64x DSPs are designed for high-performance applications requiring intensive computational capabilities, such as telecommunications, audio processing, video processing, and industrial control systems.

One of the standout features of the TMS320C64x DSP is its VLIW (Very Long Instruction Word) architecture, which allows for an exceptionally high level of parallelism. This architecture enables multiple instructions to be executed simultaneously, boosting the overall throughput and allowing for complex data processing tasks to be completed more quickly than with conventional DSPs.

The C64x DSPs also boast an impressive clock frequency range, typically up to 1 GHz, delivering substantial computational power for real-time processing goals. Additionally, these processors feature extensive on-chip memory, including L1 and L2 cache, which significantly enhances data access speeds and helps reduce bottlenecks during high-demand processing tasks.

Another key characteristic of the TMS320C64x family is its support for advanced instruction sets optimized for specific applications. These include SIMD (Single Instruction, Multiple Data) capabilities, allowing for efficient handling of large datasets often involved in multimedia processing or complex signal manipulation.

For connectivity, these DSPs often integrate advanced interfaces such as EMIF (External Memory Interface) and McBSP (Multichannel Buffered Serial Port), facilitating seamless interaction with a variety of peripheral devices. This ensures that the DSP can suit different application needs and integrate well into various system architectures.

Texas Instruments emphasizes low power consumption with the C64x DSPs, making them ideal for portable or energy-sensitive applications. Advanced power management techniques and technologies, such as dynamic voltage and frequency scaling, are incorporated to further enhance energy efficiency without compromising performance.

In summary, the Texas Instruments TMS320C64x DSP family stands out due to its high-performance capabilities driven by a VLIW architecture, high clock speeds, extensive memory options, a rich instruction set, and advanced connectivity features, all while maintaining power efficiency. These characteristics make it an exceptional choice for developers looking to integrate robust digital signal processing into their applications, whether in telecommunications, audio and video processing, or embedded control systems.