GE EPM 9650/9800 Device History Block Header, Direct Memory Access Header, Window Index Block

in bytes, allocated to External Device Programming Blocks. This memory is allocated from RAM, not NVRAM.

Record Size: This Register is an unsigned integer representing the size, in bytes, of an External Device Programming Block.

First Index: An unsigned integer representing the Index of the First External Device Programming Block.

Last Index: An unsigned integer representing the Index of the Last External Device Programming Block.

First Time Stamp: Since External Device Programming Blocks are not recorded sequentially, these Registers have no meaning.

Last Time Stamp: Since External Device Programming Blocks are not recorded sequentially, these Registers have no meaning.

Valid Bitmap: These Registers hold the bit flags to indicate the validity of individual External Device Programming Blocks. The first bit (high order bit in Register 37838) represents the validity of the First External Device Programming Block. The last bit (lowest order bit in Register 37841) represents the validity of the Last External Device Programming Block. A value of 1 means that the External Device was found and the EPM successfully received all of the Programming Block for the External Device. A value of 0 means that the External Device was not found, or errors have occurred while trying to retrieve the Programming Block or that no device is programmed for this slot.

Max Records: This Register holds an unsigned integer representing the total number of records the log is capable of holding.

8.88: Device History Block Header (37889-37906)

„Description: Device History Block currently not used.This Register holds an unsigned integer representing the total number of records the log is capable of holding.

8.89: Direct Memory Access Header (37953-37970)

„Description: Direct Memory Access currently not used.

8.90: Window Index Block (38145-38162)

„Description: Window Index Registers included in this block:

Historical Log 1 (38145): When read, this Register returns the Window Index for Historical Log 1 to access Historical Log 1 on this port. When written, this Register sets the Index used by the Historical Log 1 Window to access Historical Log 1 on this port. Each port accesses a separate, independent index through this Register, allowing all four ports to access different areas of Historical Log 1 at the same time.

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