我们在调试过程中发现STM32F427IIH6TR主机can perform 1-bit ECC correction and 2-bits ECC detection，
但是NAND Flash S34ML02G200BHI000 datasheet with 4-bit ECC per 528 bytes (×8) or 264 words (×16)，从 Flash datasheet变更历史记录里面有提到ECC 从1bit变为4bit
请问以上有什么解决方案可以让NAND Flash和STM32之间ECC可以正常使用？谢谢！Show Less
I'm making wireless switch USB with CYRF8935 module and MCU (ATmega48).
And I have some troubles with C coding.
I had read the datasheet several times, and set the registers according to the guide.
Should I program the register in specific order?
I had just programmed register from 1 to 50 in order. I guess it's the biggest problem (maybe).
CYRF8935 is programmed byte by byte, but some register(Reg52) has both read only and writable bit in one byte.
How should I program registers like this case?
The packet structure is preamble + sync word + trailer + FIFO data. FIFO data are wrote in register 50, but I can't find the registers to program preamble and trailer.
Which registers are used to program preamble and trailer?
I'm beginner in transceiver and MCU, so I have too many troubles with programming. I attach the C code of Tx.
Thank you for reading. I really appreciate any help.
We are using Cypress NOR Flash "S25FL128LAGNFV010" this along with RTOS configuration.
From total 16MB of flash, 14MB is user space and rest of 2MB is reserved.
Could you provide us latest copy of FTL and SLLD.
That will be great help to us.Show Less
The thyristor is a kind of power semiconductor device. It can also be called silicon controlled rectifier. The thyristor has one more control gate than the rectifier diode, and it is unidirectional controllable. Because of its high efficiency, good control characteristics, long life, and small size, it has been widely used. The application technology of thyristor is mainly for power conversion and control, which can be roughly divided into the following aspects:
1 Controllable rectification
The rectifier composed of thyristors can not only rectify AC to DC like a rectifier diode rectifier but also can conveniently control the DC output voltage under the condition of unchanged AC voltage, which can be controlled rectification.
2 AC voltage regulation and power regulation
The switching characteristics of the thyristor replace the old-fashioned contact voltage regulator, induction voltage regulator, and saturation point reactor voltage regulation. The thyristor is used to realize the conversion from AC to variable AC, which is mostly used for light control, temperature control, and voltage regulation and speed regulation of AC motors.
3 chopped flow regulation
Chopper voltage regulation is the conversion from DC to variable DC and is widely used in vehicle speed regulation transmission of tributary power sources, such as urban trams and electric locomotives.
4 Non-contact power static switch
Thyristors are used as power switching components instead of contactors and relays for frequent operation and high-frequency occasions.
The wide application of thyristors has brought us a lot of convenience in production and life. The following focuses on the overcurrent protection of thyristors. When the components of the thyristor device are misconducted or broken down, the circulating current inverter fails in the reversible transmission system, and the transmission device production machinery is overloaded and the mechanical failure causes the motor to lock up, etc., all will cause the current flowing through the rectifier component to greatly exceed its normal operating current. The current overload of the thyristor is much worse than that of ordinary electrical equipment, and overcurrent is inevitable, so more attention should be paid to the overcurrent protection of the thyristor. The task of over-current protection is to quickly eliminate the over-current phenomenon before the component is burnt out once the circuit has over-current. There are four main types of overcurrent protection for thyristors:
⑴ Sensitive overcurrent relay protection
The relay can be installed in an AC or DC brake. When an over-current fault occurs, it will act and trip the traffic power switch. Since the over-current relay power switch takes about 0.2S to act, it must cooperate with measures to limit the excessive short-circuit current value, otherwise, it will not be too late to protect the thyristor.
⑵ Current limit and pulse phase shift protection
The AC current transformer forms an AC current detection circuit through the rectifier bridge to obtain a voltage signal that can reflect the magnitude of the AC current to control the trigger circuit of the thyristor. When the rectifier output terminal is overloaded and the DC current increases, the AC current also increases. The output of the detection circuit exceeds a certain voltage, which causes the Zener tube to break down, and the trigger pulse of the control thyristor is increased to reduce the output voltage. The overload DC current is reduced to achieve the current limiting purpose, and the load current limiting value can be adjusted by adjusting the potentiometer. When there is a severe overcurrent or short circuit, the fault current rises rapidly. At this time, the current limit control may not be able to take effect, and the current has exceeded the allowable value. In order to eliminate the fault current as soon as possible when fully-controlled rectifying a large inductive load, the trigger pulse of the thyristor can be controlled to rapidly increase beyond the phase shift range of the rectification state, and a negative voltage appears at the output terminal instantaneously, and the circuit enters the inverter state to reduce the fault current It quickly decays to zero.
⑶ DC fast switch protection
In occasions with large capacity, high requirements, and frequent short circuits, the DC fast switch installed on the DC side can be used for overload and short circuit protection on the DC side. This kind of fast switch is specially designed, its switching time is only 0.2ms, and the total arc-off time is only 25ms～30ms.
⑷ Fast fuse protection
The fuse is the simplest and most effective protection component. Aiming at the poor over-current capability of thyristors and silicon rectifier components, a fast-acting fuse is specially manufactured called fast-acting. It has fast-acting characteristics and can achieve 5 times the rated current when flowing. When the fusing time is less than 0.02s, in the normal short-circuit current, it can ensure that the short-circuit current is quickly fused before the transistor is damaged, which is suitable for short-circuit protection occasions.
In short, overcurrent protection is based on the allowable overcurrent capability of the thyristor, trying to limit the peak value of the short-circuit current with sensitive protection measures, so that the duration of the short-circuit current is as short as possible, so as to protect the thyristor.Show Less
I want to support in-system programming of Cypress devices, including some old Flash370i family devices (e.g. the CY7C375I-83UMB CPLD). There is a Cypress application note titled “An Introduction to In System Reprogramming with Flash370i” that provides an overview of their JTAG interface and instruction codes, but states that execution of each instruction is beyond the scope of that application note. Data sheets for both older and newer Cypress devices indicate that Cypress maintains a strong commitment to third-party software vendors, including third-party programmers. As a third-party programmer vendor, I would like to get the documentation necessary to program Flash370i family and later devices via their JTAG interface. How may I acquire documentation on this?
As a possible alternative, I can execute programming test vectors in some common boundary-scan formats such as JAM/STAPL or SVF. Such files can be generated by the Cypress ISR software for newer devices. The aforementioned application note indicated that this functionality should be available for Flash370i devices as well. Is there a version of the Cypress ISR software that can generate JAM or STAPL files for Flash370i devices?Show Less
On the last delivery of the subject components the "Dot" representing Pin 1 appears on the lower left side
instead of the upper left side while the printing text is left to right (see picture).
Who may advise on Where is the real Pin 1 ???Show Less
We are looking for a 7 to 8 channel Capsense button controller IC for our speaker project.
Below are our requirements,
1. Support for at least 7 capacitive buttons
2. Support for Power On/Off buttons when the main processor is in shutdown mode
3. Single press & long press support in anyone button.
4. Low power mode to support the battery-powered operationShow Less
i recently downloaded the WS281xlib component and am trying to add it to a project of mine. i go through the step of importing at shown on the website but i cannot figure out how to be able to atually drag the component into my design. can someone please help me?Show Less