Moteur de recherche de fiches techniques de composants électroniques |
|
AD5440YRU-REEL Fiches technique(PDF) 22 Page - Analog Devices |
|
AD5440YRU-REEL Fiches technique(HTML) 22 Page - Analog Devices |
22 / 32 page AD5428/AD5440/AD5447 Data Sheet Rev. C | Page 22 of 32 PARALLEL INTERFACE Data is loaded into the AD5428/AD5440/AD5447 in 8-, 10-, or 12-bit parallel word format. Control lines CS and R/W allow data to be written to or read from the DAC register. A write event takes place when CS and R/W are brought low, data available on the data lines fills the shift register, and the rising edge of CS latches the data and transfers the latched data-word to the DAC register. The DAC latches are not transparent; therefore, a write sequence must consist of a falling and rising edge on CS to ensure that data is loaded into the DAC register and its analog equivalent is reflected on the DAC output. A read event takes place when R/W is held high and CS is brought low. Data is loaded from the DAC register, goes back into the input register, and is output onto the data line, where it can be read back to the controller for verification or diagnostic purposes. The input and DAC registers of these devices are not transparent; therefore, a falling and rising edge of CS is required to load each data-word. MICROPROCESSOR INTERFACING ADSP-21xx-to-AD5428/AD5440/AD5447 Interface Figure 44 shows the AD5428/AD5440/AD5447 interfaced to the ADSP-21xx series of DSPs as a memory-mapped device. A single wait state may be necessary to interface the AD5428/ AD5440/AD5447 to the ADSP-21xx, depending on the clock speed of the DSP. The wait state can be programmed via the data memory wait state control register of the ADSP-21xx (see the ADSP-21xx family’s user manual for details). R/W DB0 TO DB11 AD5428/ AD5440/ AD54471 ADDRESS DECODER CS DATA 0 TO DATA 23 ADDRESS BUS ADDR0 TO ADRR13 ADSP-21xx1 DATA BUS DMS WR 1ADDITIONAL PINS OMITTED FOR CLARITY. Figure 44. ADSP21xx-to-AD5428/AD5440/AD5447 Interface 8xC51-to-AD5428/AD5440/AD5447 Interface Figure 45 shows the interface between the AD5428/AD5440/ AD5447 and the 8xC51 family of DSPs. To facilitate external data memory access, the address latch enable (ALE) mode is enabled. The low byte of the address is latched with this output pulse during access to the external memory. AD0 to AD7 are the multiplexed low order addresses and data bus, and they require strong internal pull-ups when emitting 1s. During access to external memory, A8 to A15 are the high order address bytes. Because these ports are open drain, they also require strong internal pull-ups when emitting 1s. R/W DB0 TO DB11 AD5428/ AD5440/ AD54471 ADDRESS DECODER CS AD0 TO AD7 ADDRESS BUS A8 TO A15 80511 DATA BUS WR 1ADDITIONAL PINS OMITTED FOR CLARITY. 8-BIT LATCH ALE Figure 45. 8xC51-to-AD5428/AD5440/AD5447 Interface ADSP-BF5xx-to-AD5428/AD5440/AD5447 Interface Figure 46 shows a typical interface between the AD5428/ AD5440/AD5447 and the ADSP-BF5xx family of DSPs. The asynchronous memory write cycle of the processor drives the digital inputs of the DAC. The AMSx line is actually four memory select lines. Internal ADDR lines are decoded into AMS3–0, and then these lines are inserted as chip selects. The rest of the interface is a standard handshaking operation. R/W DB0 TO DB11 AD5428/ AD5440/ AD54471 ADDRESS DECODER CS DATA 0 TO DATA 23 ADDRESS BUS ADDR1 TO ADRR19 ADSP-BF5xx1 DATA BUS AMSx AWE 1ADDITIONAL PINS OMITTED FOR CLARITY. Figure 46. ADSP-BF5xx-to-AD5428/AD5440/AD5447 Interface |
Numéro de pièce similaire - AD5440YRU-REEL |
|
Description similaire - AD5440YRU-REEL |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |