MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1005

• Manufacturer Part Number: MCIMX286CVM4B
• Description: IC MPU I.MX286 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX286CVM4B

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 454MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Program Memory Size: 128KB (32K x 32)
• Program Memory Type: Mask ROM
• Ram Size: 32K x 32
• Voltage - Supply (vcc/vdd): 1.25 V ~ 5.25 V
• Data Converters: A/D 17x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 289-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

13.2.3 Hashing
The hashing module implements SHA-1 and SHA-256 hashing algorithms and a modified
CRC-32 checksum algorithm. These algorithms produce a signature for a block of data that
can be used to determine whether the data is intact.
The CRC-32 algorithm implements a 32-bit CRC algorithm similar to the one used by
Ethernet and many other protocols. The CRC differs from Unix cksum() function in three
ways:
The SHA-1 block implements a 160-bit hashing algorithm that operates on 512-bit (64-byte)
blocks as defined by US FIPS PUB 180-1 in 1995. The SHA-256 mode implements a 256-bit
hashing algorithm that operates on 512-bit (64-byte) blocks as defined by US FIPS PUB
180-2 in 2002. The purpose of the hashing module is to generate a unique signature for a
block of data that can be used to validate the integrity of the data by comparing the resulting
digest with the original digest.
Results from hash operations are written to the beginning of the payload for the descriptor.
The DCP also has the ability to check the resulting hash against a value in the payload and
issue an interrupt if a mismatch occurs.
Freescale Semiconductor, Inc.
• The CRC is initialized as 0xFFFFFFFF instead of 0x00000000.
• Logic pads zeros to a 32-bit boundary for trailing bytes.
• Logic does not post-pend the file length.
Initialization Vector (IV)
Figure 13-8. Cipher Block Chaining (CBC) Mode Decryption
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
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Chapter 13 Data Co-Processor (DCP)
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