Electronic Components Datasheet Search |
|
A29040L-150 Datasheet(PDF) 11 Page - AMIC Technology |
|
A29040L-150 Datasheet(HTML) 11 Page - AMIC Technology |
11 / 30 page A29040 Series PRELIMINARY (August, 2001, Version 0.5) 11 AMIC Technology, Inc. Write Operation Status Several bits, I/O2, I/O3, I/O5, I/O6, and I/O7, are provided in the A29040 to determine the status of a write operation. Table 5 and the following subsections describe the functions of these status bits. I/O7, I/O6 and I/O2 each offer a method for determining whether a program or erase operation is complete or in progress. These three bits are discussed first. I/O7: Data Polling The Data Polling bit, I/O7, indicates to the host system whether an Embedded Algorithm is in progress or completed, or whether the device is in Erase Suspend. Data Polling is valid after the rising edge of the final WE pulse in the program or erase command sequence. During the Embedded Program algorithm, the device outputs on I/O7 the complement of the datum programmed to I/O7. This I/O7 status also applies to programming during Erase Suspend. When the Embedded Program algorithm is complete, the device outputs the datum programmed to I/O7. The system must provide the program address to read valid status information on I/O7. If a program address falls within a protected sector, Data Polling on I/O7 is active for approximately 2 µs, then the device returns to reading array data. During the Embedded Erase algorithm, Data Polling produces a "0" on I/O7. When the Embedded Erase algorithm is complete, or if the device enters the Erase Suspend mode, Data Polling produces a "1" on I/O7.This is analogous to the complement/true datum output described for the Embedded Program algorithm: the erase function changes all the bits in a sector to "1"; prior to this, the device outputs the "complement," or "0." The system must provide an address within any of the sectors selected for erasure to read valid status information on I/O7. After an erase command sequence is written, if all sectors selected for erasing are protected, Data Polling on I/O7 is active for approximately 100 µs, then the device returns to reading array data. If not all selected sectors are protected, the Embedded Erase algorithm erases the unprotected sectors, and ignores the selected sectors that are protected. When the system detects I/O7 has changed from the complement to true data, it can read valid data at I/O7 - I/O0 on the following read cycles. This is because I/O7 may change asynchronously with I/O0 - I/O6 while Output Enable ( OE ) is asserted low. The Data Polling Timings (During Embedded Algorithms) figure in the "AC Characteristics" section illustrates this. Table 5 shows the outputs for Data Polling on I/O7. Figure 3 shows the Data Polling algorithm. START Read I/O7-I/O0 Address = VA I/O7 = Data ? FAIL No Note : 1. VA = Valid address for programming. During a sector erase operation, a valid address is an address within any sector selected for erasure. During chip erase, a valid address is any non-protected sector address. 2. I/O7 should be rechecked even if I/O5 = "1" because I/O7 may change simultaneously with I/O5. No Read I/O7 - I/O0 Address = VA I/O5 = 1? I/O7 = Data ? Yes No PASS Yes Yes Figure 3. Data Polling Algorithm |
Similar Part No. - A29040L-150 |
|
Similar Description - A29040L-150 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |