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HY29LV320BT-70 Datasheet(PDF) 9 Page - Hynix Semiconductor |
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HY29LV320BT-70 Datasheet(HTML) 9 Page - Hynix Semiconductor |
9 / 44 page 9 r1.3/May 02 HY29LV320 Table 3. HY29LV320 Secure Sector Addressing Sec2 NOT Programmed or Protected at the Factory If the security feature is not required, the Sec2 can be treated as an additional Flash memory space of 128 words. The Sec2 can be read, programmed, and erased as often as required. The Sec2 area can be protected using the following procedure: n Write the three-cycle Enter Secure Sector Re- gion command sequence. n Follow the in-system sector protect algorithm as shown in Figure 3, except that RESET# may be at either V IH or VID. This allows in-system pro- tection of the Secure Sector without raising any device pin to a high voltage. Note that this method is only applicable to the Secure Sector. n Once the Secure Sector is locked and verified, the system must write the Exit Secure Sector command sequence to return to reading and writing the remainder of the array. Sec2 protection must be used with caution since, once protected, there is no procedure available for unprotecting the Sec2 area and none of the bits in the Sec2 memory space can be modified in any way. e c i v e D e z i S r o t c e S ) s d r o W ( r o t c e S d e c a l p e R 1 e g n a R s s e r d d A 2 r e b m u N l a i r e S c i n o r t c e l E e g n a R s s e r d d A 2 T 0 2 3 V L 9 2 Y H8 2 1) 1 e l b a T ( 6 6 SF 7 0 E F 1 x 0 - 0 0 0 E F 1 x 07 0 0 E F 1 x 0 - 0 0 0 E F 1 x 0 B 0 2 3 V L 9 2 Y H8 2 1) 2 e l b a T ( 0 SF 7 0 0 0 0 x 0 - 0 0 0 0 0 0 x 07 0 0 0 0 0 x 0 - 0 0 0 0 0 0 x 0 Notes: 1. Accesses within the specified sector, but outside the specified address range, may produce indeterminate results. 2. ‘0xN. . . N’ indicates an address in hexadecimal notation. The address range is A[20:0]. BUS OPERATIONS Device bus operations are initiated through the internal command register, which consists of sets of latches that store the commands, along with the address and data information, if any, needed to execute the specific command. The command register itself does not occupy any addressable memory location. The contents of the command register serve as inputs to an internal state ma- chine whose outputs control the operation of the device. Table 4 lists the normal bus operations, the inputs and control levels they require, and the resulting outputs. Certain bus operations require a high voltage on one or more device pins. Those are described in Table 5. Data is read from the HY29LV320 by using stan- dard microprocessor read cycles while placing the word address on the device’s address inputs. The host system must drive the CE# and OE# pins LOW and drive WE# high for a valid read opera- tion to take place. See Figure 1. The HY29LV320 is automatically set for reading array data after device power-up and after a hard- ware reset to ensure that no spurious alteration of the memory content occurs during the power tran- sition. No command is necessary in this mode to obtain array data, and the device remains enabled for read accesses until the command register con- tents are altered. This device features an Erase Suspend mode. While in this mode, the host may read the array data from any sector of memory that is not marked for erasure. If the host reads from an address within an erase-suspended (or erasing) sector, or while the device is performing a program opera- tion, the device outputs status data instead of ar- ray data. After completing an Automatic Program or Erase algorithm within a sector, that sector au- tomatically returns to the read array data mode. After completing a programming operation in the Erase Suspend mode, the system may once again read array data with the same exception noted above. The host must issue a hardware reset or the soft- ware reset command to return a sector to the read array data mode if DQ[5] goes high during a pro- gram or erase cycle, or to return the device to the read array data mode while it is in the Electronic ID mode. |
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