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M50FW040 Datasheet(PDF) 18 Page - STMicroelectronics |
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M50FW040 Datasheet(HTML) 18 Page - STMicroelectronics |
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18 / 41 page  M50FW040 18/41 Program Suspend Status (Bit 2). The Program Suspend Status bit indicates that a Program oper- ation has been suspended and is waiting to be re- sumed. The Program Suspend Status should only be considered valid when the Program/Erase Controller Status bit is ‘1’ (Program/Erase Control- ler inactive); after a Program/Erase Suspend com- mand is issued the memory may still complete the operation rather than entering the Suspend mode. When the Program Suspend Status bit is ‘0’ the Program/Erase Controller is active or has complet- ed its operation; when the bit is ‘1’ a Program/ Erase Suspend command has been issued and the memory is waiting for a Program/Erase Re- sume command. When a Program/Erase Resume command is is- sued the Program Suspend Status bit returns to ‘0’. Block Protection Status (Bit 1). The Block Pro- tection Status bit can be used to identify if the Pro- gram or Erase operation has tried to modify the contents of a protected block. When the Block Pro- tection Status bit is to ‘0’ no Program or Erase op- erations have been attempted to protected blocks since the last Clear Status Register command or hardware reset; when the Block Protection Status bit is ‘1’ a Program or Erase operation has been at- tempted on a protected block. Once it is set to ‘1’ the Block Protection Status bit can only be reset to ‘0’ by a Clear Status Register command or a hardware reset. If it is set to ‘1’ it should be reset before a new Program or Erase command is issued, otherwise the new command will appear to fail. Using the A/A Mux Interface the Block Protection Status bit is always ‘0’. Reserved (Bit 0). Bit 0 of the Status Register is reserved. Its value should be masked. Table 8. Status Register Bits Note: 1. For Program operations during Erase Suspend Bit 6 is ‘1’, otherwise Bit 6 is ‘0’. Operation Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Program active ‘0’ X(1) ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ Program suspended ‘1 X(1) ‘0’ ‘0’ ‘0’ ‘1’ ‘0’ Program completed successfully ‘1’ X(1) ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ Program failure due to VPP Error ‘1’ X(1) ‘0’ ‘0’ ‘1’ ‘0’ ‘0’ Program failure due to Block Protection (FWH Interface only) ‘1’ X(1) ‘0’ ‘0’ ‘0’ ‘0’ ‘1’ Program failure due to cell failure ‘1’ X(1) ‘0’ ‘1’ ‘0’ ‘0’ ‘0’ Erase active ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ Erase suspended ‘1’ ‘1’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ Erase completed successfully ‘1’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ Erase failure due to VPP Error ‘1’ ‘0’ ‘0’ ‘0’ ‘1’ ‘0’ ‘0’ Erase failure due to Block Protection (FWH Interface only) ‘1’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘1’ Erase failure due to failed cell(s) in block ‘1’ ‘0’ ‘1’ ‘0’ ‘0’ ‘0’ ‘0’ |
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