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S25FL256SDPNFVC Datasheet(PDF) 57 Page - Cypress Semiconductor |
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S25FL256SDPNFVC Datasheet(HTML) 57 Page - Cypress Semiconductor |
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57 / 149 page  Document Number: 001-98283 Rev. *M Page 56 of 148 S25FL128S/S25FL256S 7.5.9 PPB Lock Register (PPBL) Related Commands: PPB Lock Read (PLBRD A7h, PLBWR A6h) 7.5.10 PPB Access Register (PPBAR) Related Commands: PPB Read (PPBRD E2h) 7.5.11 DYB Access Register (DYBAR) Related Commands: DYB Read (DYBRD E0h) and DYB Program (DYBP E1h). 7.5.12 SPI DDR Data Learning Registers Related Commands: Program NVDLR (PNVDLR 43h), Write VDLR (WVDLR 4Ah), Data Learning Pattern Read (DLPRD 41h). The Data Learning Pattern (DLP) resides in an 8-bit Non-Volatile Data Learning Register (NVDLR) as well as an 8-bit Volatile Data Learning Register (VDLR). When shipped from Cypress, the NVDLR value is 00h. Once programmed, the NVDLR cannot be reprogrammed or erased; a copy of the data pattern in the NVDLR will also be written to the VDLR. The VDLR can be written to at any time, but on reset or power cycles the data pattern will revert back to what is in the NVDLR. During the learning phase described in the SPI DDR modes, the DLP will come from the VDLR. Each IO will output the same DLP value for every clock edge. For example, if the DLP is 34h (or binary 00110100) then during the first clock edge all IO’s will output 0; subsequently, the 2nd clock edge all I/O’s will output 0, the 3rd will output 1, etc. When the VDLR value is 00h, no preamble data pattern is presented during the dummy phase in the DDR commands. Table 36. PPB Lock Register (PPBL) Bits Field Name Function Type Default State Description 7 to 1 RFU Reserved Volatile 00h Reserved for Future Use 0 PPBLOCK Protect PPB Array Volatile Persistent Protection Mode = 1 Password Protection Mode = 0 0 = PPB array protected until next power cycle or hardware reset 1 = PPB array may be programmed or erased. Table 37. PPB Access Register (PPBAR) Bits Field Name Function Type Default State Description 7 to 0 PPB Read or Program per sector PPB Non-volatile FFh 00h = PPB for the sector addressed by the PPBRD or PPBP command is programmed to 0, protecting that sector from program or erase operations. FFh = PPB for the sector addressed by the PPBRD or PPBP command is erased to 1, not protecting that sector from program or erase operations. Table 38. DYB Access Register (DYBAR) Bits Field Name Function Type Default State Description 7 to 0 DYB Read or Write per sector DYB Volatile FFh 00h = DYB for the sector addressed by the DYBRD or DYBP command is cleared to 0, protecting that sector from program or erase operations. FFh = DYB for the sector addressed by the DYBRD or DYBP command is set to 1, not protecting that sector from program or erase operations. |
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