„UT.6.01” változatai közötti eltérés
| 15. sor: | 15. sor: | ||
"A bus is a collection of wires used to pass information between modules."<br /> | "A bus is a collection of wires used to pass information between modules."<br /> | ||
"'''Static RAM (SRAM)''': using six metal-oxide-semiconductor field-effect transistors (MOS or MOSFET) to create each memory bit. Four transistors are used to create two cross-coupled inverters that store the binary information, and the other two are used to read and write the bit." | "'''Static RAM (SRAM)''': using six metal-oxide-semiconductor field-effect transistors (MOS or MOSFET) to create each memory bit. Four transistors are used to create two cross-coupled inverters that store the binary information, and the other two are used to read and write the bit." | ||
RAM random | RAM random access memory | ||
ROM-ok: | ROM-ok: | ||
'''ROM''' (read only memory) | |||
Static RAM (SRAM) | Static RAM (SRAM) | ||
Programmable ROM (PROM) 10000 times slower RAM | Programmable ROM (PROM) 10000 times slower RAM | ||
Electrically erasable programmable PROM (EEPROM) | Electrically erasable programmable PROM (EEPROM) | ||
"Flash ROM is a popular type of EEPROM. Each flash bit requires only two MOSFET transistors. The input (gate) of one transistor is electrically isolated, so if we trap charge on this input, it will remain there for years." | "Flash ROM is a popular type of EEPROM. Each flash bit requires only two MOSFET transistors. The input (gate) of one transistor is electrically isolated, so if we trap charge on this input, it will remain there for years." | ||
Each flash bit requires only two MOSFET transistors The input (gate) of one transistor is electrically isolated, so if we trap charge on this input, it will remain there for years. The other transistor is used to read the bit by sensing whether or not the other transistor has trapped charge. | |||
A lap 2014. január 23., 18:47-kori változata
Bevezetés
Alapok
Bináris számok és rendszerek
2.2 Beágyazott rendszerek
Processzor típusok: x86 (ált. asztali gép), ARM.
"Az I/O az a ragasztó, amivel a processzor kapcsolódik a világhoz."
Tervezési szempontok: tesztelhetőség, haszon, energia igény, méret, megfelelő válasz megfelelő időben.
Human-computer interface (HCI) or man-machine interface (MMI).
Tipikus példa: multiméter.
2.3 Bevezetés a számítógépekhez
Számítógép = proceszor + RAM + ROM + IO.
Neumann architecture, Harvard
"A port is a physical connection between the computer and its outside world. Ports allow information to enter and exit the system."
"A bus is a collection of wires used to pass information between modules."
"Static RAM (SRAM): using six metal-oxide-semiconductor field-effect transistors (MOS or MOSFET) to create each memory bit. Four transistors are used to create two cross-coupled inverters that store the binary information, and the other two are used to read and write the bit."
RAM random access memory
ROM-ok: ROM (read only memory)
Static RAM (SRAM)
Programmable ROM (PROM) 10000 times slower RAM
Electrically erasable programmable PROM (EEPROM)
"Flash ROM is a popular type of EEPROM. Each flash bit requires only two MOSFET transistors. The input (gate) of one transistor is electrically isolated, so if we trap charge on this input, it will remain there for years."
Each flash bit requires only two MOSFET transistors The input (gate) of one transistor is electrically isolated, so if we trap charge on this input, it will remain there for years. The other transistor is used to read the bit by sensing whether or not the other transistor has trapped charge.