First, the hardware engineer interview signal system articles
1. The audio frequency is generally 300~3400HZ. If it is sampled and the signal is not distorted, the minimum sampling frequency should be
How old? If the sampling frequency of 8KHZ is used and 8-bit PCM encoding is used, how much data data is stored for one second?
Big? (Shilanwei interview topic)
2. What is the Nyquist law, how to convert from analog signal to digital signal. (Huawei interview questions)
3. If the bandwidth of the analog signal is 5khz, what should I do if I want to use the 8K sampling rate? (lucent) Two ways?
4, signal and system: in the time domain and frequency domain relationship. (Huawei interview questions)
5. Give the time domain signal and find its DC component. (unknown)
6. Give a time domain signal, request (1) write the frequency component, (2) write its Fourier transform series; (3) when the wave
The filtered output waveform is drawn when the low-pass filter filters out the higher harmonics and only retains the first harmonic. (unknown)
7, sketch continuous sinusoidal signal and continuous rectangular wave (with map) Fourier transform. (Infineon pen test questions)
8. Expressions and associations of Laplace transforms and Fourier transforms. (New too hardware face)
Second, the hardware engineer's single chip article
1. Briefly describe the main components of a single-chip system and explain the flow of data and control flow between modules.
Flow direction. Briefly describe the design principles of the MCU application system. (Shilanwei interview topic)
2, draw a connection diagram of 8031 ​​and 2716 (2K * 8ROM), requires the use of three-eight decoder, 801 P2.5, P2.4 and
P2.3 participates in decoding, and the basic address range is 3000H-3FFFH. Does the 2716 have overlapping addresses? According to what? If
Yes, write the overlapping address range of each piece of 2716. (Shilanwei interview topic)
3. Design a schematic with an 8*16 keyboard and drive eight digital tubes (common yang) with the 8051. (Shi Lanwei Interview
topic)
4. What is the meaning of the PCI bus? What are the main features of the PCI bus? (Shilanwei interview topic)
5. The concept of interruption? Briefly describe the process of interruption. (Shilanwei interview topic)
6, such as the microcontroller interrupt several / type, edit the interrupt program to pay attention to what problem; (unknown)
7. An open-loop pulse speed control system is used to control the speed of the DC motor. The procedure is completed by the 8051. Simple principle
Bottom: The speed is controlled by the duty cycle of the output pulse of P3.4. The larger the duty cycle, the faster the speed; and the duty cycle is K7-K0
A switch is set to connect directly to the P1 port ("0" when the switch is turned to the bottom and "1" when it is dialed up to form an eight"
Bit binary number N) requires a duty cycle of N/256. (Shilanwei interview topic)
The following program uses the counting method to achieve this function, please add the spare part.
MOV P1, #0FFH
LOOP1 : MOV R4, #0FFH
--------
MOV R3, #00H
LOOP2 : MOV A, P1
--------
SUBB A, R3
JNZ SKP1
--------
SKP1: MOV C, 70H
MOV P3.4, C
ACALL DELAY : This delay subroutine
--------
--------
AJMP LOOP1
8. After the MCU is powered on, what should I check first? (East letter pen test)
9, What is PC Chipset? (Yangzhi electronic written test)
Chipset is the core component of the motherboard. It is usually divided into different positions on the motherboard.
North Bridge chip and South Bridge chip. The North Bridge chip provides the type and frequency of the CPU, the type and maximum capacity of the memory,
ISA/PCI/AGP slot, ECC error correction and other support. South Bridge chip provides KBC (keyboard controller), RTC (real time
Clock controller), USB (Universal Serial Bus), Ultra DMA/33 (66) EIDE data transmission method and ACPI (Advanced
Energy management) and other support. The North Bridge chip plays a leading role, also known as the Host Bridge.
In addition to the most versatile North-South bridge architecture, the current chipset is moving toward a more advanced accelerated hub architecture, Intel's
The 8xx series chipset is the representative of this type of chipset, it will have some subsystems such as IDE interface, sound effects, MODEM and USB straight
Connected to the main chip, it can provide twice the bandwidth of the PCI bus, reaching 266MB/s.
10. If the resume says that he has done cpu, he will ask questions such as how the cpu works, the assembly line and the like.
(unknown)
11, the basic components of the computer and their respective roles. (East letter pen test)
12, please draw a schematic diagram of the typical input device and microcomputer interface in the computer interface circuit (data interface, control interface
Port, register/buffer). (Han Wang written test)
13, the main part of the cache or something. (VIA VIA 2003.11.06 Shanghai pen test questions)
14, the difference between synchronous asynchronous transmission (unknown)
15. Serial communication and synchronous communication are similar, similar, and comparative. (Huawei interview questions)
16. What is the TTL logic corresponding to the high-level pulse of RS232c? (negative logic?) (Huawei interview question)
Third, the hardware engineer interview embedded articles
1. Please use a block diagram to describe a practical digital signal processing system that you are familiar with and do a brief analysis; if not,
You can also design a simple digital signal processing system and describe its function and purpose. (Shilan micro interview questions
Project)
2. Classification and structural characteristics of digital filters. (Shilanwei interview topic)
3. Similarities and differences between IIR and FIR filters. (New too hardware face)
4. Laplace transform and Z transform formula and the like, just flip through the book such as .h(n)=-a*h(n-1)+b*δ(n) a.
(n) z-transform; b. ask whether the system is a stable system; c. write the difference equation of the FIR digital filter; (unknown)
5. What is the difference between DSP and general-purpose processor? Please draw a familiar DSP structure diagram. (Xinwei
Dsp software interview questions)
6, talk about the definition of fixed-point DSP and floating-point DSP (or say their difference) (Xinwei dsp software interview questions)
7, talk about your understanding of circular addressing and bit reverse addressing. (Xinwei dsp software interview questions)
8. Please write the two's complement of [-8,7], and the binary offset code. Use Q15 to indicate 0.5 and -0.5. (Xinwei
Dsp software interview questions)
9, the structure of the DSP (Harvard structure); (unknown)
10, embedded processor type (such as ARM), operating system type (Vxworks, ucos, winCE, linux), operating system
The CS direction is in the direction of the CS, and it is covered in the CS article; (unknown)
11, there is an LDO chip will be used to power the phone, you need to evaluate him, how will you design your test items
Eye?
12. A program has been optimized in an embedded system (200M CPU, 50M SDRAM), and switched to a zero system.
Is there still an optimization in the system (300M CPU, 50M SDRAM)? (Intel)
13. Please briefly describe the basic principles of HUFFMAN coding and its basic implementation methods. (Shilanwei interview topic)
14. Name the four layers (any four layers) in the OSI seven-layer network protocol. (Shilanwei interview topic)
15, A) (Shi Lanwei interview questions)
#i nclude
Void testf(int*p)
{
*p+=1;
}
Main()
{
Int *n,m[2];
n=m;
m[0]=1;
m[1]=8;
Testf(n);
Printf("Data value is %d ",*n);
}
------------------------------
B)
#i nclude
Void testf(int**p)
{
*p+=1;
}
Main()
{int *n,m[2];
n=m;
m[0]=1;
m[1]=8;
Testf(&n);
Printf(Data value is %d",*n);
}
Is the result of program A or program B?
Data value is 8
So what is the result of another program?
16. Which sort of method is the fastest? (Huawei interview questions)
17. Write two sorting algorithms. Which one is better? (VIA)
18, compile a simple program to find n! (Infineon pen test questions)
19. Write an algorithm for n! in a programming language. (VIA VIA 2003.11.06 Shanghai pen test questions)
20, write a recursive algorithm in C language to find N! (Huawei interview questions)
21, give a C function, find errors on strings and arrays; (Huawei interview questions)
22. How is the firewall implemented? (Huawei interview questions)
23. Which aspect of programming are you familiar with? (Huawei interview questions)
24, the principle of bubble sorting. (New too hardware face)
25. The function of the operating system. (New too hardware face)
26. The computer language and system developed. (New too hardware face)
27. A farmer found that a square fence is more than a wooden pole but has the same area. The number of sheep is the same as the number of piles in the square fence but less than 36. How many sheep are there? (VIA)
28, C language to achieve statistics on the number of times a cell is called in a .v file (this topic is true bt) (VIA VIA
2003.11.06 Shanghai pen test questions)
29. Write a driver for controlling the motor vibrator in the phone in C language. (Weisheng)
30. Use perl or TCL/Tk to implement a program for character string recognition and comparison. (unknown)
31. Give a stack structure, and display the result after interrupt, mainly because the test stack is pressed into the return address and stored at the low end address or the high end. (unknown)
32. Some DOS commands, such as displaying files, copying, and deleting. (unknown)
33. Design a class so that any form of derived class of any kind can not produce any object instance. (IBM)
34. What is pre-emption? (Intel)
35, What is the state of a process if a resource is not available? (Intel)
36, three float a, b, c; question value (a + b) + c == (b + a) + c, (a + b) + c = = (a + c) + b. (Intel)
37. Fill in a linked list in the opposite direction. (lucent)
38, x^4+a*x^3+x^2+c*x+d Need to do a few multiplications at least? (Dephi)
Fourth, hardware engineer interview IC design articles (see below)
Fifth, the hardware engineer interview circuit articles (see below)
2012 hardware engineer interview questions (Huawei Zhongxing Infineon, etc.).rar (53.97 KB, Downloads: 1135)
Download points: points -1
Security. Thanks to Bitcoin's proven economic model, millions of miners defend the assets on the chain
Scalable. Performance breakthroughs are achieved by infinitely increasing parallel Bitcoin-like blockchains
Many chain structure
Going back to what users are concerned about, when you use the Kadena public chain:
There's no need to wait. Up to 480,000TPS transaction processing speed, helping you achieve "second to second transfer"
There is no need to pay high fees. Benefit from the superior expansion performance, your commission fee can be as low as 0.1 yuan or even free!
1. The audio frequency is generally 300~3400HZ. If it is sampled and the signal is not distorted, the minimum sampling frequency should be
How old? If the sampling frequency of 8KHZ is used and 8-bit PCM encoding is used, how much data data is stored for one second?
Big? (Shilanwei interview topic)
2. What is the Nyquist law, how to convert from analog signal to digital signal. (Huawei interview questions)
3. If the bandwidth of the analog signal is 5khz, what should I do if I want to use the 8K sampling rate? (lucent) Two ways?
4, signal and system: in the time domain and frequency domain relationship. (Huawei interview questions)
5. Give the time domain signal and find its DC component. (unknown)
6. Give a time domain signal, request (1) write the frequency component, (2) write its Fourier transform series; (3) when the wave
The filtered output waveform is drawn when the low-pass filter filters out the higher harmonics and only retains the first harmonic. (unknown)
7, sketch continuous sinusoidal signal and continuous rectangular wave (with map) Fourier transform. (Infineon pen test questions)
8. Expressions and associations of Laplace transforms and Fourier transforms. (New too hardware face)
Second, the hardware engineer's single chip article
1. Briefly describe the main components of a single-chip system and explain the flow of data and control flow between modules.
Flow direction. Briefly describe the design principles of the MCU application system. (Shilanwei interview topic)
2, draw a connection diagram of 8031 ​​and 2716 (2K * 8ROM), requires the use of three-eight decoder, 801 P2.5, P2.4 and
P2.3 participates in decoding, and the basic address range is 3000H-3FFFH. Does the 2716 have overlapping addresses? According to what? If
Yes, write the overlapping address range of each piece of 2716. (Shilanwei interview topic)
3. Design a schematic with an 8*16 keyboard and drive eight digital tubes (common yang) with the 8051. (Shi Lanwei Interview
topic)
4. What is the meaning of the PCI bus? What are the main features of the PCI bus? (Shilanwei interview topic)
5. The concept of interruption? Briefly describe the process of interruption. (Shilanwei interview topic)
6, such as the microcontroller interrupt several / type, edit the interrupt program to pay attention to what problem; (unknown)
7. An open-loop pulse speed control system is used to control the speed of the DC motor. The procedure is completed by the 8051. Simple principle
Bottom: The speed is controlled by the duty cycle of the output pulse of P3.4. The larger the duty cycle, the faster the speed; and the duty cycle is K7-K0
A switch is set to connect directly to the P1 port ("0" when the switch is turned to the bottom and "1" when it is dialed up to form an eight"
Bit binary number N) requires a duty cycle of N/256. (Shilanwei interview topic)
The following program uses the counting method to achieve this function, please add the spare part.
MOV P1, #0FFH
LOOP1 : MOV R4, #0FFH
--------
MOV R3, #00H
LOOP2 : MOV A, P1
--------
SUBB A, R3
JNZ SKP1
--------
SKP1: MOV C, 70H
MOV P3.4, C
ACALL DELAY : This delay subroutine
--------
--------
AJMP LOOP1
8. After the MCU is powered on, what should I check first? (East letter pen test)
9, What is PC Chipset? (Yangzhi electronic written test)
Chipset is the core component of the motherboard. It is usually divided into different positions on the motherboard.
North Bridge chip and South Bridge chip. The North Bridge chip provides the type and frequency of the CPU, the type and maximum capacity of the memory,
ISA/PCI/AGP slot, ECC error correction and other support. South Bridge chip provides KBC (keyboard controller), RTC (real time
Clock controller), USB (Universal Serial Bus), Ultra DMA/33 (66) EIDE data transmission method and ACPI (Advanced
Energy management) and other support. The North Bridge chip plays a leading role, also known as the Host Bridge.
In addition to the most versatile North-South bridge architecture, the current chipset is moving toward a more advanced accelerated hub architecture, Intel's
The 8xx series chipset is the representative of this type of chipset, it will have some subsystems such as IDE interface, sound effects, MODEM and USB straight
Connected to the main chip, it can provide twice the bandwidth of the PCI bus, reaching 266MB/s.
10. If the resume says that he has done cpu, he will ask questions such as how the cpu works, the assembly line and the like.
(unknown)
11, the basic components of the computer and their respective roles. (East letter pen test)
12, please draw a schematic diagram of the typical input device and microcomputer interface in the computer interface circuit (data interface, control interface
Port, register/buffer). (Han Wang written test)
13, the main part of the cache or something. (VIA VIA 2003.11.06 Shanghai pen test questions)
14, the difference between synchronous asynchronous transmission (unknown)
15. Serial communication and synchronous communication are similar, similar, and comparative. (Huawei interview questions)
16. What is the TTL logic corresponding to the high-level pulse of RS232c? (negative logic?) (Huawei interview question)
Third, the hardware engineer interview embedded articles
1. Please use a block diagram to describe a practical digital signal processing system that you are familiar with and do a brief analysis; if not,
You can also design a simple digital signal processing system and describe its function and purpose. (Shilan micro interview questions
Project)
2. Classification and structural characteristics of digital filters. (Shilanwei interview topic)
3. Similarities and differences between IIR and FIR filters. (New too hardware face)
4. Laplace transform and Z transform formula and the like, just flip through the book such as .h(n)=-a*h(n-1)+b*δ(n) a.
(n) z-transform; b. ask whether the system is a stable system; c. write the difference equation of the FIR digital filter; (unknown)
5. What is the difference between DSP and general-purpose processor? Please draw a familiar DSP structure diagram. (Xinwei
Dsp software interview questions)
6, talk about the definition of fixed-point DSP and floating-point DSP (or say their difference) (Xinwei dsp software interview questions)
7, talk about your understanding of circular addressing and bit reverse addressing. (Xinwei dsp software interview questions)
8. Please write the two's complement of [-8,7], and the binary offset code. Use Q15 to indicate 0.5 and -0.5. (Xinwei
Dsp software interview questions)
9, the structure of the DSP (Harvard structure); (unknown)
10, embedded processor type (such as ARM), operating system type (Vxworks, ucos, winCE, linux), operating system
The CS direction is in the direction of the CS, and it is covered in the CS article; (unknown)
11, there is an LDO chip will be used to power the phone, you need to evaluate him, how will you design your test items
Eye?
12. A program has been optimized in an embedded system (200M CPU, 50M SDRAM), and switched to a zero system.
Is there still an optimization in the system (300M CPU, 50M SDRAM)? (Intel)
13. Please briefly describe the basic principles of HUFFMAN coding and its basic implementation methods. (Shilanwei interview topic)
14. Name the four layers (any four layers) in the OSI seven-layer network protocol. (Shilanwei interview topic)
15, A) (Shi Lanwei interview questions)
#i nclude
Void testf(int*p)
{
*p+=1;
}
Main()
{
Int *n,m[2];
n=m;
m[0]=1;
m[1]=8;
Testf(n);
Printf("Data value is %d ",*n);
}
------------------------------
B)
#i nclude
Void testf(int**p)
{
*p+=1;
}
Main()
{int *n,m[2];
n=m;
m[0]=1;
m[1]=8;
Testf(&n);
Printf(Data value is %d",*n);
}
Is the result of program A or program B?
Data value is 8
So what is the result of another program?
16. Which sort of method is the fastest? (Huawei interview questions)
17. Write two sorting algorithms. Which one is better? (VIA)
18, compile a simple program to find n! (Infineon pen test questions)
19. Write an algorithm for n! in a programming language. (VIA VIA 2003.11.06 Shanghai pen test questions)
20, write a recursive algorithm in C language to find N! (Huawei interview questions)
21, give a C function, find errors on strings and arrays; (Huawei interview questions)
22. How is the firewall implemented? (Huawei interview questions)
23. Which aspect of programming are you familiar with? (Huawei interview questions)
24, the principle of bubble sorting. (New too hardware face)
25. The function of the operating system. (New too hardware face)
26. The computer language and system developed. (New too hardware face)
27. A farmer found that a square fence is more than a wooden pole but has the same area. The number of sheep is the same as the number of piles in the square fence but less than 36. How many sheep are there? (VIA)
28, C language to achieve statistics on the number of times a cell is called in a .v file (this topic is true bt) (VIA VIA
2003.11.06 Shanghai pen test questions)
29. Write a driver for controlling the motor vibrator in the phone in C language. (Weisheng)
30. Use perl or TCL/Tk to implement a program for character string recognition and comparison. (unknown)
31. Give a stack structure, and display the result after interrupt, mainly because the test stack is pressed into the return address and stored at the low end address or the high end. (unknown)
32. Some DOS commands, such as displaying files, copying, and deleting. (unknown)
33. Design a class so that any form of derived class of any kind can not produce any object instance. (IBM)
34. What is pre-emption? (Intel)
35, What is the state of a process if a resource is not available? (Intel)
36, three float a, b, c; question value (a + b) + c == (b + a) + c, (a + b) + c = = (a + c) + b. (Intel)
37. Fill in a linked list in the opposite direction. (lucent)
38, x^4+a*x^3+x^2+c*x+d Need to do a few multiplications at least? (Dephi)
Fourth, hardware engineer interview IC design articles (see below)
Fifth, the hardware engineer interview circuit articles (see below)
2012 hardware engineer interview questions (Huawei Zhongxing Infineon, etc.).rar (53.97 KB, Downloads: 1135)
Uploaded on 2012-3-28 10:25:59
Downloads: 1135Download points: points -1
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Through its unique "fragmented multi-chain structure", it achieves the following characteristics:
Security. Thanks to Bitcoin's proven economic model, millions of miners defend the assets on the chain
Scalable. Performance breakthroughs are achieved by infinitely increasing parallel Bitcoin-like blockchains
Many chain structure
Going back to what users are concerned about, when you use the Kadena public chain:
There's no need to wait. Up to 480,000TPS transaction processing speed, helping you achieve "second to second transfer"
There is no need to pay high fees. Benefit from the superior expansion performance, your commission fee can be as low as 0.1 yuan or even free!
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