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X76F041A Datasheet(PDF) 3 Page - Xicor Inc. |
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X76F041A Datasheet(HTML) 3 Page - Xicor Inc. |
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3 / 21 page  X76F041 3 DEVICE OPERATION There are three primary modes of operation for the X76F041; READ, WRITE and CONFIGURATION. The READ and WRITE modes may be performed with or without an 8-byte password. The CONFIGURATION mode always requires an 8-byte password. The basic method of communication is established by first enabling the device (CS LOW), generating a start condition and then transmitting a command and address field followed by the correct password (if configured to require a password). All parts will be shipped from the factory in the non-password mode. The user must per- form an ACK Polling routine to determine the validity of the password and start the data transfer (see Acknowl- edge Polling). Only after the correct password is accepted and an ACK Polling has been performed can the data transfer occur. To ensure correct communication, RST must remain LOW under all conditions except when initiating a “Response to Reset sequence”. Figure 1. X76F041 Device Operation Data is transferred in 8-bit segments, with each transfer being followed by an ACK, generated by the receiving device. If the X76F041 is in a nonvolatile write cycle a “no ACK” (SDA HIGH) response will be issued in response to load- ing of the command + high order address byte. If a stop condition is issued prior to the nonvolatile write cycle the write operation will be terminated and the part will reset and enter into a standby mode. The basic sequence is illustrated in Figure 1. After each transaction is completed, the X76F041 will reset and enter into a standby mode. This will also be the response if an attempt is made to access any limited array. Password Registers The three passwords, Read, Write and Configuration are stored in three 64 bit Write Only registers as illus- trated in figure 2. Figure 2. Password Registers Device Configuration Five 8-Bit configuration registers are used to configure the X76F041. These are shown in figure 3. Figure 3. Configuration Registers LOAD LOW ORDER ADDRESS / CONFIGURATION INSTRUCTION BYTE LOAD 8–BYTE PASSWORD (IF APPLICABLE) VERIFY PASSWORD ACCEPTANCE BY USE OF ACK POLLING (IF APPLICABLE) READ / WRITE DATA BYTES LOAD COMMAND+HIGH ORDER ADDRESS BYTE 7002 ILL F03 64 BIT WRITE PASSWORD 64 BIT READ PASSWORD 64 BIT CONFIGURATION PASSWORD 63 0 7002 ILL F04 ACR1 ACR2 CR RR RC RES RES RES RESERVED RETRY REGISTER CONFIGURATION REGISTER ARRAY CONTROL REGISTER 2 ARRAY CONTROL REGISTER 1 RETRY COUNTER 7002 ILL F04B 63 0 |
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