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SST38VF6402B-70-5I-TV Datasheet(PDF) 9 Page - Microchip Technology |
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SST38VF6402B-70-5I-TV Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 58 page  2013 Microchip Technology Inc. Preliminary DS25002B-page 9 SST38VF6401B / SST38VF6402B / SST38VF6403B / SST38VF6404B Write cycles must be issued or the operation will abort. Each Write cycle decrements the Write-Buffer counter, even if two or more of the Write cycles have identical address values. Only the final data loaded for each buf- fer location is held in the Write-Buffer. Once the Write-to-Buffer command sequence is com- pleted, the Program Buffer-to-Flash command should be issued to program the Write-Buffer contents to the specified block in memory. The block address (i.e. A21 - A15) in this command must match the block address in the 4th write cycle of the Write-to-Buffer command or the operation aborts. See Table 5-2 for details on Write- to-Buffer and Program-Buffer-to-Flash commands. While issuing these command sequences, the Write- Buffer Programming Abort detection bit (DQ1) indi- cates if the operation has aborted. There are several cases in which the device can abort: • In the fourth write cycle of the Write-to-Buffer command, if the WC is greater than 15, the opera- tion aborts. • In the fifth and all subsequent cycles of the Write- to-Buffer command, if the address values, A21 - A4, are not identical, the operation aborts. • If the number of write cycles between the fifth to the last cycle of the Write-to-Buffer command is greater than WC +1, the operation aborts. • After completing the Write-to-Buffer command sequence, issuing any command other than the Program Buffer-to-Flash command, aborts the operation. • Loading a block address, i.e. A21-A15, in the Pro- gram Buffer-to-Flash command that does not match the block address used in the Write-to-Buf- fer command aborts the operation. If the Write-to-Buffer or Program Buffer-to-Flash opera- tion aborts, then DQ1 = 1 and the device enters Write- Buffer-Abort mode. To execute another operation, a Write-to-Buffer Abort-Reset command must be issued to clear DQ1 and return the device to standard read mode. After the Write-to-Buffer and Program Buffer-to-Flash commands are successfully issued, the programming operation can be monitored using Data# Polling, Tog- gle Bits, and RY/BY#. 4.5 Block-Erase Operations The Block-Erase operation allows the system to erase the device on a block-by-block basis. The Block-Erase architecture is based on block size of 32 KWords. In SST38VF6401B and SST38VF6402B devices, the Block-Erase command can erase any 32KWord Block (B0-B127). For the non-uniform boot block devices, SST38VF6403B and SST38VF6404B, the Block-Erase command can erase any 32 KWord block except the block that contains the boot area. In the boot area, Block-Erase only erases a 4KWord block. The Block-Erase operation is initiated by executing a six-byte command sequence with Block-Erase com- mand (30H) and block address (BA) in the last bus cycle. The block address is latched on the falling edge of the sixth WE# pulse, while the command (30H) is latched on the rising edge of the sixth WE# pulse. The internal Erase operation begins after the sixth WE# pulse. The End-of-Erase operation can be determined using either Data# Polling or Toggle Bit methods. The RY/BY# pin can also be used to monitor the erase operation. For more information, see Figure 6-10 for timing waveforms and Figure 6-24 for the flowchart. Any commands, other than Erase-Suspend, issued during the Block-Erase operation are ignored. Any attempt to Block-Erase memory inside a block pro- tected by Volatile Block Protection, Non-Volatile Block Protection, or WP# (low) will be ignored. During the command sequence, WP# should be statically held high or low. 4.6 Erase-Suspend/Erase-Resume Commands The Erase-Suspend operation temporarily suspends a Block-Erase operation thus allowing data to be read or programmed into any block that is not engaged in an Erase operation. The operation is executed with a one- byte command sequence with Erase-Suspend com- mand (B0H). The device automatically enters read mode within 20 µs (max) after the Erase-Suspend com- mand had been issued. Valid data can be read, using a Read or Page Read operation, from any block that is not being erased. Reading at an address location within Erase-Suspended blocks will output DQ2 tog- gling and DQ6 at ‘1’. While in Erase-Suspend, a Word- Program or Write-Buffer Programming operation is allowed anywhere except the block selected for Erase- Suspend. To resume a suspended Block-Erase operation, the system must issue the Erase-Resume command. The operation is executed by issuing one byte command sequence with Erase-Resume command (30H) at any address in the last Byte sequence. When an erase operation is suspended, or re-sus- pended, after resume the cumulative time needed for the erase operation to complete is greater than the erase time of a non-suspended erase operation. If the hold time from Erase-Resume to the next Erase- Sus- pend operation is less than 200µs, the accumulative erase time can become very long Therefore, after issu- ing an Erase-Resume command, the system must wait at least 200µs before issuing another Erase-Suspend command. The Erase-Resume command will be ignored until any program operations initiated during Erase-Suspend are complete. |
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