Sundance SMT942 - Manual (Page 27)

User Manual SMT942 Page 27 of 55 Last Edited: 23/08/2011 17:25:00
0 ‘0’ VCXO selected
1 ‘1’ External clock selected
Setting Bit 10 Description RESHAPE
0 ‘0’ Reference clock reshaped
1 ‘1’ Reference clock not reshaped
Setting Bit 11 Description SEL_DELAY
0 ‘0’ Enables short delay for fast operation
1 ‘1’ Long delay – recommended for reference below 150mhz.
Setting Bit 12 Description RESET_HOLD
0 ‘0’ RESET or HOLD acts as nRESET pin
1 ‘1’ RESET or HOLD acts as nHOLD pin
CLOCK Register 18 0x28.
Clock Register 18 0x28
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
1 Reserved nRESET_nHO
LD
nPD Reserved
Default ‘000’ ‘0’ ‘1’ ‘000’
0 Reserved Reserved
Default ‘0000’ ‘1100’
Reset Register 18 0x28
Setting Bit 11 Description nPD
0 ‘0’ Power-down mode active
1 ‘1’ Normal mode of operation
Setting Bit 12 Description nRESET_nHOLD
0 ‘0’ Forces RESET or HOLD
1 ‘1’ Normal mode of operation
CLOCK Register 19 0x29.
Clock Register 19 0x29
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
1
Default
0
Default
Reset Register 19 0x29
Setting Bit 11 Description nPD
0