|Description||Pass TM Secureflash|
|Datasheet||Download X76F041A datasheet
FEATURES 64-Bit Password Security Three Password Modes --Secure Read Access --Secure Write Access --Secure Configuration Access Programmable Configuration --Read, Write and Configuration Access Passwords --Multiple Array Access/Functionality --Retry Register/Counter 8 Byte Sector Write (4) 1K Memory Arrays ISO Response to Reset Low Power CMOS --50µ A Standby Current --3mA Active Current or 5V "Univolt" Read and Program Power Supply Versions High Reliability --Endurance: 100,000 Cycles --Data Retention: 100 Years --ESD Protection: 2000V on All Pins
The is a password access security supervisor device, containing four x 8 bit SecureFlash arrays. Access can be controlled by three 64-bit programmable passwords, one for read operations, one for write operations and one for device configuration. The X76F041 features a serial interface and software protocol allowing operation on a simple two wire bus. The bus signals are a clock input (SCL) and a bidirectional data input and output (SDA). Access to the device is controlled through a chip select input (CS), allowing any number of devices to share the same bus. The X76F041 also features a synchronous response to reset; providing an automatic output of a pre-configured 32-bit data stream conforming to the ISO standard for memory cards. The X76F041 utilizes Xicor's proprietary Direct WriteTM cell, providing a minimum endurance of 100,000 cycles per sector and a minimum data retention of 100 years.CHIP ENABLE DATA TRANSFER RETRY COUNTER SCL SDA INTERFACE LOGIC ARRAY ACCESS ENABLE 0800FF
PIN DESCRIPTION Serial Data Input/Output (SDA) SDA is a true three state serial data input/output pin. During a read cycle, data is shifted out on this pin. During a write cycle, data is shifted in on this pin. In all other cases this pin in a high impedance state. Serial Clock (SCL) The Serial Clock controls the serial bus timing for data input and output. Chip Select (CS) When CS is HIGH, the X76F041 is deselected and the SDA pin is at high impedance and unless an internal write operation is underway the X76F041 will be in the standby power mode. CS LOW enables the X76F041, placing it in the active power mode. Reset (RST) RST is a device reset pin. When RST is pulsed HIGH while CS is LOW the X76F041 will output 32 bits of fixed data which conforms to the ISO standard for "synchronous response to reset". CS must remain LOW and the part must not in a write cycle for the response to reset to occur. If at any time during the response to reset CS goes HIGH, the response to reset will be aborted and the part will return to the standby mode. PIN CONFIGURATIONDescription
Chip Select Input Serial Data Input/Output Reset Input Serial Clock Input Ground Supply Voltage No Connect
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 perform an ACK Polling routine to determine the validity of the password and start the data transfer (see Acknowledge 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 in a nonvolatile write cycle a "no ACK" (SDA HIGH) response will be issued in response to loading 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 illustrated in figure 2. Figure 2. Password RegistersLOAD LOW ORDER ADDRESS / CONFIGURATION INSTRUCTION BYTE
Device Configuration Five 8-Bit configuration registers are used to configure the X76F041. These are shown in figure 3. Figure 3. Configuration Registers
RESERVED RETRY COUNTER RETRY REGISTER CONFIGURATION REGISTER ARRAY CONTROL REGISTER 2 ARRAY CONTROL REGISTER 1 7002 ILL F04B
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