Texas Instruments TMS320C6457 manual Performing a Multiplexed Access Without has, Hstrb HR/W

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HPI Operation

 

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3.7Performing a Multiplexed Access Without HAS

The HAS signal is not required when the host processor has dedicated signals (address lines or bit I/O) capable of driving the control lines. Dedicated pins can be directly connected to HCNTL[1:0], HR/W, and

HHWIL.

Figure 3 and Figure 5 show examples of signal connections when HAS is not used for multiplexed transfers. When HAS is not used, it must be tied high (inactive). Figure 9 and Figure 10 show typical HPI signal activity when HAS is tied high. The falling edge of internal HSTRB latches the HCNTL[1:0], HR/W, and HHWIL states into the HPI. Internal HSTRB is derived from HCS, HDS1, and HDS2, as described in Section 3.3.

Figure 9. 16-Bit Multiplexed Mode Host Read Cycle With HAS Tied High

HCS

 

 

Internal

 

 

HSTRB

 

 

HR/W

 

 

HCNTL[1:0]

 

 

HD[15:0]

Data 1

Data 2

HRDYA

 

 

HHWIL

HPI latches

Host latches

HPI latches

Host latches

control information

data

control information

data

ADepending on the type of write operation (HPID without autoincrementing, HPIA, HPIC, or HPID with autoincrementing) and the state of the FIFO, transitions on HRDY may or may not occur. For more information, see Section 3.9.

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Host Port Interface (HPI)

SPRUGK7A –March 2009 –Revised July 2010

Copyright © 2009–2010, Texas Instruments Incorporated

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Contents Users Guide SPRUGK7A -March 2009 -Revised July Has Appendix aHDS2 HDS1 HCS List of Figures List of Tables Related Documentation From Texas Instruments About This ManualNotational Conventions Introduction to the HPI Summary of the HPI Registers Summary of HPI Registers Summary of the HPI SignalsHPI Signals HR/WI Hhwili Hasi HstrbDual-HPIA Mode Using the Address RegistersSingle-HPIA Mode Host-HPI Signal Connections HPI OperationHhwil HPI Configuration and Data Flow HDS2, HDS1, and HCS Data Strobing and Chip Selection Options for Connecting Host and HPI Data Strobe PinsAvailable Host Data Strobe Pins Access Types Selectable by the Hcntl Signals Cycle Types Selectable With the Hcntl and HR/W SignalsHCNTL10 and HR/W Indicating the Cycle Type Cycle TypeHas Forcing the HPI to Latch Control Information Early HCS Has Hrdy a HhwilHCS Has HR/W Hrdya HhwilPerforming a Multiplexed Access Without has Hstrb HR/WBit Multiplexed Mode Host Write Cycle With has Tied High Single-Halfword Hpic Cycle in the 16-Bit Multiplexed Mode Hardware Handshaking Using the HPI-Ready Hrdy SignalHrdy Behavior During 16-Bit Multiplexed Read Operations HrdyHrdy Behavior During 16-Bit Multiplexed Write Operations HR/W HhwilHrdy Behavior During 32-Bit Multiplexed Read Operations Hrdy Behavior During 32-Bit Multiplexed Write Operations Hpia WriteHpid Read Hpia Write HPID+ ReadsHpia Write Hpid Write Hpia Write HPID+ Writes Software Handshaking Using the HPI Ready Hrdy Bit Polling the Hrdy BitInterrupts Between the Host and the CPU Dspint Bit Host-to-CPU InterruptsHint Bit CPU-to-Host Interrupts DSPINT=0CPU-to-Host Interrupt State Diagram FIFOs and Bursting Read BurstingWrite Bursting Fifo Behavior When a Hardware Reset or Software Reset Occurs Fifo Flush ConditionsEmulation and Reset Considerations Software Reset ConsiderationsHardware Reset Considerations Emulation ModesHost Port Interface HPI Registers HPI RegistersIntroduction Power and Emulation Management Register Pwremumgmt Soft Free R/W-0 R/W-0Bit Field Value Description SoftHost Port Interface Control Register Hpic Dualhpia FetchFor host write cycle HPID/HPIC/HPIAR/HPIAWBit Field Value Description 31-0 Host Port Interface Address Registers Hpiaw and HpiarAddress Data Register Hpid Data Register Hpid Field DescriptionsData HPI dataSeeAdditions/Modifications/Deletions Appendix a Revision HistoryTMS320C6457 HPI Revision History Products Applications Rfid

TMS320C6457 specifications

The Texas Instruments TMS320C6457 is a high-performance digital signal processor (DSP) designed for demanding applications in telecommunications, industrial control, and video processing. As part of the TMS320C6000 family, the C6457 combines advanced features with impressive processing capabilities, making it a popular choice among developers looking for efficient and robust solutions.

One of the key features of the TMS320C6457 is its architecture, which is based on the super Harvard architecture. This design separates program and data memory paths, allowing for parallel instruction execution. The C6457 operates at clock speeds of up to 1 GHz, enabling it to deliver peak performance of over 6,000 MIPS (Million Instructions Per Second) and 12,000 MADDs (Multiply-Accumulate operations per second). Such high throughput makes the C6457 suitable for real-time processing applications that require rapid data handling.

The C6457 DSP integrates a rich set of on-chip resources, including up to 1MB of on-chip SRAM, which serves as a fast cache for data and instructions. The device features multiple high-speed interfaces, such as 10/100/1000 Ethernet, Serial RapidIO, and PCI-Express, facilitating seamless connectivity with other devices and systems. Furthermore, the TMS320C6457 supports various communication protocols, allowing it to adapt to a wide range of application scenarios.

In terms of power efficiency, the TMS320C6457 is designed with sophisticated power management features. It includes dynamic voltage and frequency scaling, which adjust power consumption based on workload requirements without compromising performance. This capability is particularly valuable in battery-operated devices or environments where thermal management is critical.

The TMS320C6457 also benefits from extensive software support, including the Texas Instruments DSP/BIOS real-time operating system and Code Composer Studio integrated development environment. Developers can leverage these tools for efficient code development, debugging, and system optimization. Additionally, Texas Instruments provides a range of libraries and algorithms optimized for the C6457, facilitating rapid application development.

Overall, the Texas Instruments TMS320C6457 DSP stands out due to its robust architecture, high processing capabilities, comprehensive connectivity options, and power management features. These attributes make it a versatile solution for a broad spectrum of applications in digital signal processing, where performance and efficiency are paramount. As technology continues to advance, the TMS320C6457 remains a relevant and potent option for developers seeking to push the boundaries of digital signal processing.
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