 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
S29AL008D Datasheet(PDF) 27 Page - SPANSION |
|
||||||||||||||||||||||||||||||
S29AL008D Datasheet(HTML) 27 Page - SPANSION |
|
|
27 / 55 page  June 16, 2005 S29AL008D_00A3 S29AL008D 27 Da t a S h ee t Write Operation Status The device provides several bits to determine the status of a write operation: DQ2, DQ3, DQ5, DQ6, DQ7, and RY/BY#. Table 6, on page 32 and the following subsections describe the functions of these bits. DQ7, RY/BY#, and DQ6 each offer a method for determining whether a program or erase operation is complete or in progress. These three bits are discussed first. DQ7: Data# Polling The Data# Polling bit, DQ7, 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 DQ7 the com- plement of the datum programmed to DQ7. This DQ7 status also applies to programming during Erase Suspend. When the Embedded Program algorithm is complete, the device outputs the datum programmed to DQ7. The system must provide the program address to read valid status information on DQ7. If a pro- gram address falls within a protected sector, Data# Polling on DQ7 is active for approximately 1 µs, then the device returns to reading array data. During the Embedded Erase algorithm, Data# Polling produces a 0 on DQ7. When the Embedded Erase algorithm is complete, or if the device enters the Erase Sus- pend mode, Data# Polling produces a 1 on DQ7. 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 DQ7. After an erase command sequence is written, if all sectors selected for erasing are protected, Data# Polling on DQ7 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 se- lected sectors that are protected. When the system detects DQ7 changes from the complement to true data, it can read valid data at DQ7–DQ0 on the following read cycles. This is because DQ7 may change asynchronously with DQ0–DQ6 while Output Enable (OE#) is as- serted low. Figure 19, on page 45, Data# Polling Timings (During Embedded Algorithms), illustrates this. Table 6, on page 32 shows the outputs for Data# Polling on DQ7. Figure 5, on page 28 shows the Data# Polling algorithm. |
Similar Part No. - S29AL008D |
|
Similar Description - S29AL008D |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
