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EM4169A5WT11 Datasheet(PDF) 8 Page - EM Microelectronic - MARIN SA |
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EM4169A5WT11 Datasheet(HTML) 8 Page - EM Microelectronic - MARIN SA |
8 / 15 page EM4069 EM4169 Copyright 2003, EM Microelectronic-Marin SA 8 www.emmicroelectronic.com Command 5 : Read configuration word Read configuration word command is an auxiliary command used to read configuration word. This mode will be active until power down or reset command. The 8-bit CRC with polynomial u 8 + u4 + u3 + u2 + u0 is used in commands 3 and 4. The CRC is calculated including the Command-Byte. CRC Calculation U 8 U 2 U 3 U 4 7 6 5 4 3 2 1 0 MSB LSB Data + + + + + Exclusive OR Register Stage Fig. 9 The following table shows the CRC according to some test bytes: Byte [hex] Resulting CRC [hex] 01 1D 80 26 In test above it is supposed that the leftmost bit is the MSB and is transmitted first. Within 1ms after EEPROM update completion, a further command will be accepted by the EM4069 without a new synchronization pattern. After time-out of this period, the EM4069 will return to read out mode. Write 16 bit EEPROM Word Command As described in the Command Table an 8-bit pattern has to be sent to execute commands rst, rROM and rcw. Bit pattern of Write Word command is different since word address, 16 bits of data and 8 bit CRC have to be transmitted. The Write command bit pattern is the following: 1100 [4 bit word address] [16 bit data] [8 bit CRC] Word address: One of eight EEPROM words is selected. Valid addresses are in range from 0 (0000) to 7 (0111) Data bits: During read out bit which is first sent in is first read out (FIFO) CRC: Calculated over whole command stream Example of Write Word command: C5 D2 2D 20 (hex) The above command (1100 0101) write to • Word 5 • hexadecimal data “D2 2D” • CRC bits are hex 20. in Sync. wr out Read Read tWee 1ms Fig. 10 Write Configuration word Command Configuration word is a special word which is used to lock (protect from writing) EEPROM words. The bits of configuration word are OTP (once programmed at 1 they can not be reprogrammed to 0). Special care has to be taken when adding lock bits to the protection word that already has some bits set to one. The bits that are already set to one have to be confirmed at a new command in order to allow writing of additional bits. If not, bits that are already locked stay locked, and the new selected bits might not be programmed. |
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