10.2 Definitions
Bad Block: A block, which has been determined to be unreliable for storing user data.
Bad Block Table: A table of bad block entries for a memory board. The data stored in the entry identifies the chip and block number of the bad block. The table entry also contains a flag field. The flag field is used to determine the circumstance in which the bad block was detected. It also provides a flag indicating whether the corresponding bad block has previously been "Secure Erased."
Block: A storage unit within the flash device. A block is the smallest unit of memory that can be erased.
Byte: A contiguous set of 8 bits that are acted on as a unit.
Channel ID: A unique value assigned to each channel in a system. Each channel must have a unique Channel ID (data channels and playback channels).
Channel Specific Data Word: A required word for each data type channel that has data specific information.
Checksum: The arithmetic sum of data bytes or words.
Erasing Flash: Performing an erase function on a flash device. Erasing a flash device sets all bits to a known logic state.
EVPD: Enable vital product data.
Intra-Packet Data Header: A header containing time and status information for the tagging of data inside a packet.
Long Word: A contiguous set of 32 bits that are acted on as a unit.
lsb: The "least significant bit" of a series of bits.
LSB: The "least significant byte" of a series of bytes.
LSW: The "least significant word" of a series of words.
LSLW: The "least significant long word" of a series of long words.
Magic Number: An identifier for the directory block. This identifier is a value chosen to support discovery of lost directory entries and directory reconstruction after a fault.
Memory Board: Printed circuit board containing flash memory devices used to store user data.
msb: The "most significant bit" of a series of bits.
MSB: The "most significant byte" of a series of bytes.
MSW: The "most significant word" of a series of words.
MSLW: The "most significant long word" of a series of long words.
Multiplexer: The entity that includes all the inputs, control interfaces, and functionality required to properly record data.
Non-volatile: Memory media that retains data when power is removed.
Packet: Encapsulates a block of observational and ancillary application data which is to be recorded.
Packet Header: Identifies the source and characteristics of the data packet and encapsulation environment.
Packet Secondary Header: Contains Packet Header time.
Page: Storage unit within the flash device. A page is the smallest storage unit that can be written.
Quad Word: A contiguous set of 64 bits that are acted on as a unit.
Recorder: The entity that includes the input and control interfaces, the Removable Memory Module (RMM), and the functionality required to properly record data.
Recording Session: Time interval from first data packet generated to end of the recording
Relative Time Counter: A free-running 10 MHz binary counter represented by 48-Bits common to all data channels. The counter shall be derived from an internal crystal oscillator and shall remain free running during each recording session. The applicable data bit to which the 48-bit value applies will be defined in each data type section.
Removable Memory Module (RMM): The element of the data recorder that contains the stored data.
Stream: A series of packets that are generated until the end of the recording session.
Word: A contiguous set of 16 bits that are acted on as a unit.
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