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S29JL064H60TAI003 Datasheet(PDF) 11 Page - SPANSION |
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S29JL064H60TAI003 Datasheet(HTML) 11 Page - SPANSION |
11 / 64 page March 26, 2004 S29JL064HA1 S29JL064H 11 Pre l i m i n a r y Word/Byte Configuration The BYTE# pin controls whether the device data I/O pins operate in the byte or word configuration. If the BYTE# pin is set at logic ‘1’, the device is in word con- figuration, DQ15–DQ0 are active and controlled by CE# and OE#. If the BYTE# pin is set at logic ‘0’, the device is in byte configuration, and only data I/O pins DQ7–DQ0 are active and controlled by CE# and OE#. The data I/ O pins DQ14–DQ8 are tri-stated, and the DQ15 pin is used as an input for the LSB (A-1) address function. Requirements for Reading Array Data To read array data from the outputs, the system must drive the CE# and OE# pins to VIL. CE# is the power control and selects the device. OE# is the output control and gates array data to the output pins. WE# should remain at VIH. The BYTE# pin determines whether the device outputs array data in words or bytes. The internal state machine is set for reading array data upon device power-up, or after a hardware reset. This ensures that no spurious alteration of the memory content occurs during the power transition. No command is necessary in this mode to obtain array data. Standard microprocessor read cycles that assert valid addresses on the device address inputs produce valid data on the device data outputs. Each bank remains enabled for read access until the command register contents are altered. Refer to the AC Read-Only Operations table for timing specifications and to 14 for the timing diagram. ICC1 in the DC Characteristics table represents the active cur- rent specification for reading array data. 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. For program operations, the BYTE# pin determines whether the device accepts program data in bytes or words. Refer to “Word/Byte Configuration” for more information. 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 or byte, instead of four. The “Byte/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 3 indicates the address space that each sector occupies. Similarly, a “sector address” is the address bits required to uniquely select a sector. The “Command Definitions” section has details on erasing a sector or the entire chip, or suspend- ing/resuming the erase operation. The device address space is divided into four banks. A “bank address” is the ad- dress bits required to uniquely select a bank. ICC2 in the DC Characteristics table represents the active current specification for the write mode. The AC Characteristics section contains timing specification ta- bles and timing diagrams for write operations. |
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