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28HS01GTAM03 数据表(PDF) 36 Page - Infineon Technologies AG |
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28HS01GTAM03 数据表(HTML) 36 Page - Infineon Technologies AG |
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36 / 138 page  Datasheet 36 of 138 002-18216 Rev. *W 2022-01-18 256Mb/512Mb/1Gb SEMPER™ Flash Octal interface, 1.8V/3.0V Features 4.3 Interface CRC Interface CRC performs a hardware accelerated CRC calculation on the communication between a host and the device, ensuring the integrity of information transferred. A CRC is an error-detecting code commonly used in devices to detect accidental changes to raw data. Interface CRC protection is a configuration option (ICEV[0] - ITCRCE). The Interface CRC method in HL-T/HS-T family devices relies entirely on the host to verify the CRC check-value and take appropriate actions. The device calculates the CRC check-value which the host reads using the Read Interface CRC transaction (RDCRC_4_0). The check-value calculated includes all transaction contents while CS# is LOW, namely command, address and data. This CRC checksum can be generated across either a single trans- action or a set of transactions. The only limitation is that the data size over which the slave is calculating the CRC checksum must be less than 232 bits. The host must also calculate the CRC check-value over the same transaction sequence. When ready, the host can read the device's calculated CRC check-value and compare it with its own. If there is a mismatch, the host can choose to repeat the complete transaction sequence. Figure 38 CRC calculation overview Notes • At the end of the CRC read transaction, the device resets the CRC check-value and reinitializes the CRC polynomial. - CRC32 Polynomial: X32 + X28 + X27 + X26 + X25 + X23 + X22 + X20 + X19 + X18 + X14 + X13 + X11 + X10 + X9 + X8 + X6 + 1 • The CRC polynomial between the host and the device must be identical. • Interface CRC is supported with Octal DDR protocol only. • The Interface CRC check-value will reset to 0xFFFFFFFFh under the following conditions: -POR -Hardware Reset -Software Reset - CS# Signaling Reset - A read of the Interface CRC check-value • Exit from Deep Power Down CK CS# Command (16 Bits) Address (32 Bits) Read Data (n Bits) Command (16 Bits) Address (32 Bits) Write Data (n Bits) DQ[7:0] Read Transaction Program Transaction CRC32 - Equation CRC Read Every 32-bits of data is shifted into CRC32 and the Checksum is updated CK CS# Command (16 Bits) Address (32 Bits) Read Data (n Bits) Command (16 Bits) Address (32 Bits) Write Data (n Bits) DQ[7:0] Read Transaction Program Transaction CRC32 - Equation CRC Read Every 32-bits of data is shifted into CRC32 and the Checksum is updated |
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