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Diamond-MM-48-AT User Manual V1.01 Page 26
Base + 14 Write Calibration Control Register
Bit No. 7 6 5 4 3 2 1 0
Name EE_EN EE_RW RUNCAL CMUXEN TDACEN
This register is used to initiate various commands related to autocalibration. More detailed
information on autocalibration may be found elsewhere in this manual.
EE_EN EEPROM Enable. Writing a 1 to this bit will initiate a transfer to/from the
EEPROM as indicated by the EE_RW bit.
EE_RW Selects read or write operation for the EEPROM: 0 = Write, 1 = Read.
RUNCAL Writing 1 to this bit causes the board to reload the calibration settings from
EEPROM.
CMUXEN Calibration multiplexor enable. The cal mux is used to read precision on-board
reference voltages that are used in the autocalibration process. It also can be
used to read back the value of analog output 0.
1 = enable cal mux and disable user analog input channels
0 = disable cal mux, enable user inputs
TDACEN TrimDAC Enable. Writing 1 to this bit will initiate a transfer to the TrimDAC (used
in the autocalibration process).
Base + 14 Read Calibration Status Register
Bit No. 7 6 5 4 3 2 1 0
Name 0 TDBUSY EEBUSY CMUXEN TDACEN 0 0 0
TDBUSY TrimDAC busy indicator
0 User may access TrimDAC
1 TrimDAC is being accessed; user must wait
EEBUSY EEPROM busy indicator
0 User may access EEPROM
1 EEPROM is being accessed; user must wait
Base + 15 Write EEPROM Access Key Register
The user must write the value 0xA5 (binary 10100101) to this register each time after setting the
PAGE bit in order to get access to the EEPROM. This helps prevent accidental corruption of the
EEPROM contents.
Base + 15 Read FPGA Revision Code
This register may be read back to indicate the revision level of the FPGA code. The FPGA
revision starts at 1 and increments up each time the code is revised.