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Publish: 2021-05-26 23:34:35
1. The off chip ram has large capacity and low price. For example, the commonly used DDR ram
has latency when reading and writing. Generally, it reads and writes according to burst, that is, it gives an initial address, and then reads and writes a piece of data from this address. This is more efficient. If you write only one address each time, or the burst is very short, the efficiency will be much lower.
Xilinx Altera all provides free interface IP core, and how to use it? See their datasheet
SDRAM needs to refresh every other time. However, now interface core all provides auto refresh function, so don't worry about it for users.
has latency when reading and writing. Generally, it reads and writes according to burst, that is, it gives an initial address, and then reads and writes a piece of data from this address. This is more efficient. If you write only one address each time, or the burst is very short, the efficiency will be much lower.
Xilinx Altera all provides free interface IP core, and how to use it? See their datasheet
SDRAM needs to refresh every other time. However, now interface core all provides auto refresh function, so don't worry about it for users.
2. Belong to the status of less than above and more than below, don't talk nonsense about your high salary, but it's not low. At the beginning of graation, the salary of 10000 to 20000 is enough to live. It can't be compared with software, but it can be compared with manual workers. Although the salary is almost the same, you are at least miserable
when you have rich experience, your income will be high
when you have rich experience, your income will be high
3. There are many buses to Shan county. If you get off at Shangqiu south station, you can take the bus directly (1 quick money) to the long-distance bus station and buy a ticket. If you get off at the railway station, it's the coach station opposite. It's very convenient.
4. Bus route: Shengzhou No.23, the whole journey is about 3.8 km
1. Walk about 10 meters from Shengzhou passenger transport west station to west station
2. Take Shengzhou No.23, pass 5 stops,
to Milan sunshine station (or take Shengzhou No.20)
3. Walk about 570 meters to Chengnan farm
1. Walk about 10 meters from Shengzhou passenger transport west station to west station
2. Take Shengzhou No.23, pass 5 stops,
to Milan sunshine station (or take Shengzhou No.20)
3. Walk about 570 meters to Chengnan farm
5.
Open the microblog you want to share, and click three points in the upper right corner to share:
6. The full name of GMPC is guideline for good manufacturing practice of cosmetic procts, which is called good manufacturing practice of cosmetics in Chinese to ensure the health of consumers after normal use
GMPC good manufacturing practice for cosmetics was first promulgated by the U.S. Congress in 1963 to regulate drug proction. This is also the first GMP in the world. Since GMP is very effective in standardizing the proction of drugs, improving the quality of drugs and ensuring the safety of drugs, FDA, the food and Drug Administration of the United States, promulgated the food GMP in 1980 to regulate the proction of food.
GMPC good manufacturing practice for cosmetics was first promulgated by the U.S. Congress in 1963 to regulate drug proction. This is also the first GMP in the world. Since GMP is very effective in standardizing the proction of drugs, improving the quality of drugs and ensuring the safety of drugs, FDA, the food and Drug Administration of the United States, promulgated the food GMP in 1980 to regulate the proction of food.
7. GMPC five elements:
quality system, procurement, proction, subcontract proction and quality management
standardize drug proction, improve drug quality and ensure drug safety
quality system, procurement, proction, subcontract proction and quality management
standardize drug proction, improve drug quality and ensure drug safety
8. Cold punching force P = 0.8 π Dt σ B
where:
P = punching force kg
d = punching diameter mm
t = sheet metal thickness mm
σ B = tensile strength limit of sheet metal, refer to relevant manual and convert it into kg / mm2
if it is not round hole, put π D is changed to the total peripheral length of the punched hole, the others are the same
the calculation of hot stamping is the same, but the change of material strength into hot strength has to be checked in the manual.
where:
P = punching force kg
d = punching diameter mm
t = sheet metal thickness mm
σ B = tensile strength limit of sheet metal, refer to relevant manual and convert it into kg / mm2
if it is not round hole, put π D is changed to the total peripheral length of the punched hole, the others are the same
the calculation of hot stamping is the same, but the change of material strength into hot strength has to be checked in the manual.
9. Intertek is the world's leading third-party testing, inspection and certification organization
which can test GMPC certification reports.
which can test GMPC certification reports.
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