Sundance SMT381 2007 - Manual (Page 29)

0x2
0x2
0x2
0x021 (Smt338DiodeTempReg) (2)
0x028 (DaughterCardAirTempReg) (3)
0x029 (DaughterCardDiodeTempReg) (4)
xx
xx
xx
xx
xx
xx
(1) - SMT338-VP Air Temperature on Top of PCB
(2) – SMT338-VP FPGA temperature on Bottom of PCB
(3) – SMT381 Air Temperature on Bottom of PCB
(4) – SMT381 ADC temperature on Top of PCB
Read Response Format:
31 .. 28 27 .. 24 23 .. 20 19 .. 16 15 .. 12 11 .. 8 7 .. 4 3 .. 0
Command Address Data MSB Data LSB
0x2
0x2
0x2
0x2
0x020
0x021
0x028
0x029
SMT338-VP
SMT338-VP
SMT381
SMT381
Air Temperature
Diode Temperature
Air Temperature
Diode Temperature
Figure 18: Temperature Registers (Read Only)
11.1.3 DAC Clock Source Registers (Write Add 0x801)
The A and B channels of the DAC can receive a clock from the on-board VCO, the on-
board clock synthesizer, or from an external clock (RF or ECL). The following table
shows the different combinations for setting up the SMT381 clock tree.
Register
Value
A Channel Clock Source B Channel Clock Source
0x0000 On-board VCO On-board VCO
0x0001 On-board Clock Synthesizer On-board Clock Synthesizer
0x0002 External ECL Clock External ECL Clock
0x0003 External ECL Clock External ECL Clock
0x0004 On-board VCO On-board VCO
0x0005 On-board Clock Synthesizer On-board Clock Synthesizer
0x0006 External RF Clock External RF Clock
0x0007 External RF Clock External RF Clock
Figure 19: Clock Source Selection Table (Write Only)
11.1.4 Clock Synthesizer Setup Register (Write Add 0x800)
This register sets up the frequency of the clock synthesizer on the SMT381. Any write
operation to this register will trigger the clock synthesizer interface control logic to
initialize the clock synthesizer with its new value.
For a detailed description of the configurable bits in the Clock Synthesizer register
please refer to the “Clock Synthesizer” section under “Firmware Building Blocks” at the
end of this document.
User Manual SMT381 Page 29 of 31 Last Edited: 12/06/2007 10:43:00