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S75PL127JBEBAWB2 Datasheet(PDF) 19 Page - SPANSION |
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S75PL127JBEBAWB2 Datasheet(HTML) 19 Page - SPANSION |
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19 / 183 page  20 S29PL127J/S29PL064J/S29PL032J for MCP S29PL127J_064J_032J_MCP_00_A3 August 12, 2004 Preli m inary Writing Commands/Command Sequences To write a command or command sequence (which includes programming data to the device and erasing sectors of memory), the system must drive WE# and CE# to VIL, and OE# to VIH. The device features an Unlock Bypass mode to facilitate faster programming. Once a bank enters the Unlock Bypass mode, only two write cycles are required to program a word, instead of four. The “Word Program Command Sequence” section has details on programming data to the device using both standard and Unlock Bypass command sequences. An erase operation can erase one sector, multiple sectors, or the entire device. Table 4 indicates the set of address space that each sector occupies. A “bank ad- dress” is the set of address bits required to uniquely select a bank. Similarly, a “sector address” refers to the address bits required to uniquely select a sector. The “Command Definitions” section has details on erasing a sector or the entire chip, or suspending/resuming the erase operation. ICC2 in the DC Characteristics table represents the active current specification for the write mode. See the timing specification tables and timing diagrams in the Reset for write operations. Accelerated Program Operation The device offers accelerated program operations through the ACC function. This function is primarily intended to allow faster manufacturing throughput at the factory. If the system asserts VHH on this pin, the device automatically enters the afore- mentioned Unlock Bypass mode, temporarily unprotects any protected sectors, and uses the higher voltage on the pin to reduce the time required for program operations. The system would use a two-cycle program command sequence as required by the Unlock Bypass mode. Removing VHH from the WP#/ACC pin re- turns the device to normal operation. Note that VHH must not be asserted on WP#/ACC for operations other than accelerated programming, or device damage may result. In addition, the WP#/ACC pin should be raised to VCC when not in use. That is, the WP#/ACC pin should not be left floating or unconnected; incon- sistent behavior of the device may result. Autoselect Functions If the system writes the autoselect command sequence, the device enters the au- toselect mode. The system can then read autoselect codes from the internal register (which is separate from the memory array) on DQ15–DQ0. Standard read cycle timings apply in this mode. Refer to the SecSiTM Sector Addresses and Autoselect Command Sequence for more information. Standby Mode When the system is not reading or writing to the device, it can place the device in the standby mode. In this mode, current consumption is greatly reduced, and the outputs are placed in the high impedance state, independent of the OE# input. The device enters the CMOS standby mode when the CE# and RESET# pins are both held at VIO ± 0.3 V. (Note that this is a more restricted voltage range than VIH.) If CE# and RESET# are held at VIH, but not within VIO ± 0.3 V, the device will be in the standby mode, but the standby current will be greater. The device |
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