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SST34HF32A4-70-4E-L1PE Datasheet(PDF) 3 Page - Silicon Storage Technology, Inc |
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SST34HF32A4-70-4E-L1PE Datasheet(HTML) 3 Page - Silicon Storage Technology, Inc |
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3 / 37 page  Preliminary Specifications 32 Mbit Concurrent SuperFlash + 16 Mbit PSRAM ComboMemory SST34HF32A4 3 ©2006 Silicon Storage Technology, Inc. S71313-02-000 8/06 Flash Program Operation These devices are programmed on a word-by-word or byte-by-byte basis depending on the state of the CIOF pin. Before programming, one must ensure that the sector being programmed is fully erased. The Program operation is accomplished in three steps: 1. Software Data Protection is initiated using the three-byte load sequence. 2. Address and data are loaded. During the Program operation, the addresses are latched on the falling edge of either BEF# or WE#, whichever occurs last. The data is latched on the rising edge of either BEF# or WE#, whichever occurs first. 3. The internal Program operation is initiated after the rising edge of the fourth WE# or BEF#, which- ever occurs first. The Program operation, once ini- tiated, will be completed typically within 7 µs. See Figures 9 and 10 for WE# and BEF# controlled Pro- gram operation timing diagrams and Figure 22 for flow- charts. During the Program operation, the only valid reads are Data# Polling and Toggle Bit. During the internal Pro- gram operation, the host is free to perform additional tasks. Any commands issued during an internal Program opera- tion are ignored. Flash Sector- /Block-Erase Operation These devices offer both Sector-Erase and Block-Erase operations. These operations allow the system to erase the devices on a sector-by-sector (or block-by-block) basis. The sector architecture is based on a uniform sector size of 2 KWord. The Block-Erase mode is based on a uniform block size of 32 KWord. The Sector-Erase operation is initi- ated by executing a six-byte command sequence with a Sector-Erase command (50H) and sector address (SA) in the last bus cycle. The Block-Erase operation is initiated by executing a six-byte command sequence with Block-Erase command (30H) and block address (BA) in the last bus cycle. The sector or block address is latched on the falling edge of the sixth WE# pulse, while the command (30H or 50H) is latched on the rising edge of the sixth WE# pulse. The internal Erase operation begins after the sixth WE# pulse. Any commands issued during the Block- or Sector- Erase operation are ignored except Erase-Suspend and Erase-Resume. See Figures 14 and 15 for timing wave- forms. Flash Chip-Erase Operation The SST34HF32A4 provide a Chip-Erase operation, which allows the user to erase all flash sectors/blocks to the “1” state. This is useful when the device must be quickly erased. The Chip-Erase operation is initiated by executing a six- byte command sequence with Chip-Erase command (10H) at address 555H in the last byte sequence. The Erase operation begins with the rising edge of the sixth WE# or BEF#, whichever occurs first. During the Erase operation, the only valid read is Toggle Bits or Data# Polling. See Table 6 for the command sequence, Figure 13 for timing diagram, and Figure 26 for the flowchart. Any commands issued during the Chip-Erase operation are ignored. When WP# is low, any attempt to Chip-Erase will be ignored. Flash Erase-Suspend/-Resume Operations The Erase-Suspend operation temporarily suspends a Sector- or Block-Erase operation thus allowing data to be read from any memory location, or program data into any sector/block that is not suspended for an Erase operation. The operation is executed by issuing a one-byte command sequence with Erase-Suspend command (B0H). The device automatically enters read mode within 20 µs after the Erase-Suspend command had been issued. Valid data can be read from any sector or block that is not suspended from an Erase operation. Reading at address location within erase-suspended sectors/blocks will output DQ2 tog- gling and DQ6 at “1”. While in Erase-Suspend mode, a Pro- gram operation is allowed except for the sector or block selected for Erase-Suspend. To resume Sector-Erase or Block-Erase operation which has been suspended, the system must issue an Erase-Resume command. The operation is executed by issuing a one-byte command sequence with Erase Resume command (30H) at any address in the one-byte sequence. |
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