What is mea nt by hardware re co-design and how does this apply to interrupts? W
ID: 3737480 • Letter: W
Question
What is mea nt by hardware re co-design and how does this apply to interrupts? What is meant by hardware/software co-verification and how does the GNU kernel debugger fit into this process? Find the device Tree source file for the Pine64 on D2L and the Schematic. Identify the four GPIO lines of the JTAG interface in the device tree source. a. Can these ports and pins be found on the schematic: b. If so, identify the devices and/or connectors these go to: JTAG CLocK JTAG Data In JTAG Data Out JTAG Mode Select Output
Explanation / Answer
ANS
Hardware/Software co-design
Hardware/software codesign investigates the concurrent design of hardware and software components of complex electronic systems.
It tries to exploit the synergy of hardware and software with the goal to optimize and/or satisfy design constraints such as cost, performance, and power of the final product.
Hardware/Software interface
The HW/SW interface and the CPU subsystems must handle the interaction between software tasks and the interconnect structure. The interface provides the application software layer with an abstraction of the SoC architecture, called a parallel programming model. It also includes a network interface for both multiprocessor booting and interprocessor communication that connects the subsystem to the network. When the SoC includes more than one CPU, HW/SW interface design becomes more complicated. Parallel programming models are more complex than uniprocessor programming models; similarly, network interfaces are more complex than a unified
memory. Thus, as a recent multiprocessor SoC case study confirms,3 the HW/SW interface could become a key challenge in heterogeneous SoC design.
B) HArdware - Software Co-Verification
An SoC is really ready to ship when the complete application works, not just when hardware simulations pass regressions.
In other words, the ultimate test for a chip is to see it perform its application correctly and completely.
That means executing the embedded software together with the hardware. Such tests require billions of cycles of execution, and usually run at the system-level, where design size is the greatest. Simulating such applications even on advanced workstations is simply too slow.
ZeBu emulation has the execution speed to simulate the full application, plus the unique co-debug environment that allows both hardware and software debugging.
With ZeBu, hardware designers have access to signal waveforms within the chip, while software developers use their standard software debuggers, typically connected through JTAG interfaces to the processors.
ZeBu's unique technology, which synchronizes simultaneous hardware and software views, allows for very easy debug of low-level software, initialization vectors and device drivers.
c) ANS
JTAG Clock =
If the pin is not available, the test logic can be reset by switching to the reset state synchronously, using Test Clock.
JTAG Data In =
As with any clocked signal, data presented to Test Data In must be valid for some chip-specific Setup time before and Hold time after the relevant (here, rising) clock edge.
JTAG Data Out =
Teat Data Our data is valid for some chip-specific time after the falling edge of Test Clock.
JTAG Mode Select Output =
If the pin is not available, the test logic can be reset by switching to the reset state synchronously, using Test Mode Select.
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