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K8D1716UBB-TC07 Datasheet(PDF) 10 Page - Samsung semiconductor |
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K8D1716UBB-TC07 Datasheet(HTML) 10 Page - Samsung semiconductor |
10 / 40 page FLASH MEMORY K8D1716UTB / K8D1716UBB Revision 0.0 July 2004 10 DEVICE OPERATION Byte/Word Mode If the BYTE pin is set at logical "1" , the device is in word mode, DQ0-DQ15 are active. Otherwise the BYTE pin is set at logical "0" , the device is in byte mode, DQ0-DQ7 are active. DQ8-DQ14 are in the High-Z state and DQ15 pin is used as an input for the LSB (A-1) address pin. Read Mode The K8D1716U is controlled by Chip Enable (CE), Output Enable (OE) and Write Enable (WE). When CE and OE are low and WE is high, the data stored at the specified address location,will be the output of the device. The outputs are in high impedance state whenever CE or OE is high. Standby Mode The K8D1716U features Stand-by Mode to reduce power consumption. This mode puts the device on hold when the device is dese- lected by making CE high (CE = VIH). Refer to the DC characteristics for more details on stand-by modes. Output Disable The device outputs are disabled when OE is High (OE = VIH). The output pins are in high impedance state. Automatic Sleep Mode K8D1716U features Automatic Sleep Mode to minimize the device power consumption. Since the device typically draws 5 µA of the current in Automatic Sleep Mode, this feature plays an extremely important role in battery-powered applications. When addresses remain steady for tAA+50ns, the device automatically activates the Automatic Sleep Mode. In the sleep mode, output data is latched and always available to the system. When addresses are changed, the device provides new data without wait time. Data Outputs tAA + 50ns Data Auto Sleep Mode Address Data Data Data Data Figure 1. Auto Sleep Mode Operation Autoselect Mode The K8D1716U offers the Autoselect Mode to identify manufacturer and device type by reading a binary code. The Autoselect Mode allows programming equipment to automatically match the device to be programmed with its corresponding programming algorithm. In addition, this mode allows the verification of the status of write protected blocks. This mode is used by two method. The one is high voltage method to be required VID (8.5V~12.5V) on address pin A9. When A9 is held at VID and the bank address or block address is asserted, the device outputs the valid data via DQ pins(see Table 9 and Figure 2). The rest of addresses except A0, A1 and A6 are Don ′t Care. The other is autoselect command method that the autoselect code is accessible by the commamd sequence without VID. The manufacturer and device code may also be read via the command register. The Command Sequence is shown in Table 8 and Figure 3. The autoselect operation of block protect verification is initiated by first writing two unlock cycle. The third cycle must con- tain the bank address and autoselect command (90H). If Block address while (A6, A1, A0) = (0,1,0) is finally asserted on the address pin, it will produce a logical "1" at the device output DQ0 to indicate a write protected block or a logical "0" at the device output DQ0 to indicate a write unprotected block. To terminate the autoselect operation, write Reset command (F0H) into the command register. |
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