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TC58FVM5T3AFT65 데이터시트(PDF) 13 Page - Toshiba Semiconductor |
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TC58FVM5T3AFT65 데이터시트(HTML) 13 Page - Toshiba Semiconductor |
13 / 63 page TC58FVM5(T/B)(2/3)A(FT/XB)65 2003-01-29 13/63 BLOCK PROTECTION Block Protection is a function for disabling writing and erasing specific blocks. Block protection can be carried out in two ways: by supplying a high voltage (VID) to the device (see Block protection 1) or by supplying a high voltage and a command sequence (see Block protection 2). (1) Block protection 1 Specify a device block address and make the following signal settings A9 = OE = VID, A1 = VIH and CE = A0 = A6 = VIL. Now when a pulse is input to WE for tPPLH, the device will start to write to the block protection circuit. Block protection can be verified using the Verify Block Protect command. Inputting VIL on OE sets the device to Verify Mode. 01H is output if the block is protected and 00H is output if the block is unprotected. If block protection was unsuccessful, the operation must be repeated. Releasing VID from A9 and OE terminates this mode. (2) Block protection 2 Applying VID to RESET and inputting the Block Protect 2 command also performs block protection. The first cycle of the command sequence is the Set-up command. In the second cycle, the Block Protect command is input, in which a block address and A1 = VIH and A0 = A6 = VIL are input. Now the device writes to the block protection circuit. There is a wait of tPPLH until this write is completed; however, no intervention is necessary during this time. In the third cycle the Verify Block Protect command is input. This command verifies the write to the block protection circuit. Read is performed in the fourth cycle. If the protection operation is complete, 01H is output. If a value other than 01H is output, block protection is not complete and the Block Protect command must be input again. Removing the VID input from RESET exits this mode. Temporary Block Unprotection The TC58FVM5T2A/B2A/T3A/B3A has a temporary block unprotection feature which disables block protection for all protected blocks. Unprotection is enabled by applying VID to the RESET pin. Now Write and Erase operations can be performed on all blocks except the boot blocks which have been protected by the Boot Block Protect operation. The device returns to its previous state when VID is removed from the RESET pin. That is, previously protected blocks will be protected again. Verify Block Protect The Verify Block Protect command is used to ascertain whether a block is protected or unprotected. Verification is performed either by inputting the Verify Block Protect command or by applying VID to the A9 pin, as for ID Read Mode, and setting the block address = A0 = A6 = VIL and A1 = VIH. If the block is protected, 01H is output. If the block is unprotected, 00H is output. Boot Block Protection Boot block protection temporarily protects certain boot blocks using a method different from ordinary block protection. Neither VID nor a command sequence is required. Protection is performed simply by inputting VIL on /ACC WP . The target blocks are the two pairs of boot blocks. The top boot blocks are BA69 and BA70; the bottom boot blocks are BA0 and BA1. Inputting VIH on /ACC WP releases the mode. From now on, if it is necessary to protect these blocks, the ordinary Block Protection Mode must be used. |
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