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X25F047P-5 Datasheet(PDF) 4 Page - Xicor Inc. |
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X25F047P-5 Datasheet(HTML) 4 Page - Xicor Inc. |
4 / 14 page X25F047 4 Operational Notes The X25F047 powers up in the following state: • The device is in the low power, standby state. • A HIGH to LOW transition on CS is required to enter an active state and receive an instruction. • SO pin is at high impedance. • The “Program Enable” latch is reset. Data Protection The following circuitry has been included to prevent inad- vertant programming of data: • The “Program Enable” latch is reset upon power-up. • A PREN instruction must be issued to set the “Program Enable” latch. • CS must come HIGH at the proper clock count in order to start a program cycle. Table 1. Instruction Set and Block Lock Protection Byte Definition 7005 FRM T03.1 *Instructions are shown with MSB in leftmost position. Instructions are transferred MSB first. Figure 2. Read Operation Sequence Instruction Format* Instruction Name and Operation 0000 0110 PREN: Set the Program Enable Latch (Program Enable Operation) 0000 0100 PRDI: Reset the Program Enable Latch (Program Disable Operation) 0000 0001 PROGRAM STATUS Instruction - followed by: Block Lock Protection Byte: (Figure 1) 0000 0000 --->NO PROTECT: ---------------------------------->None of the Array 0000 0001 --->PROTECT Q1: --- 0000h - 007Fh ---------->Lower Quadrant (Q1) 0000 0010 --->PROTECT Q2: --- 0080h - 00FFh----------->Q2 0000 0011 --->PROTECT Q3: --- 0100h - 017Fh----------->Q3 0000 0100 --->PROTECT Q4: --- 0180h - 01FFh----------->Upper Quadrant (Q4) 0000 0101 --->PROTECT H1: --- 0000h - 00FFh----------->Lower Half of the Array (H1) 0000 0110 --->PROTECT S0: --- 0000h - 000Fh----------->Lower Sector (S0) 0000 0111 --->PROTECT Sn: --- 01F0h - 01FFh----------->Upper Sector (Sn) 0000 0101 READ STATUS: Reads Block Lock Protection & nonvolatile write in progress status on SO Pin 0000 0010 PROGRAM: Program operation followed by address and data 0000 0011 READ: Read operation followed by address 0 1 2 3 4 5 6 7 8 9 CS SCK SI SO HIGH IMPEDANCE READ INSTRUCTION (1 BYTE) BYTE ADDRESS (2 BYTE) DATA OUT 15 14 3 2 1 0 20 21 22 23 24 25 26 27 28 29 30 7005 FRM F03.1 7 6 5 4 3 2 1 0 |
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