STC5455 Datasheet, PDF (42/56 Pages) Connor-Winfield Corporation – Synchronous Clock for SETS

Synth_Index_Select, 0x4A (R/W)
STC5455
Synchronous Clock for SETS
Data sheet
Address
Bit7
0x4A
Bit6
Bit5
Not Used
Bit4
Bit3
Bit2
Bit1
Bit0
Synthesizer index selection for synthesizer frequency and
phase skew adjustment
Determines which synthesizer is selected for setting frequency value at the register Synth_Freq_Value and
adjusting phase skew at the register Synth_Skew_Adj.
Field Value
0
1
2
Default value: 0
Synth_Freq_Value, 0x4B (R/W)
Synthesizer
Synthesizer F
Synthesizer G₁
Synthesizer G₂
Associated CLK Output
CLK8K, CLK2K, CLK2
CLK1
CLK2
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0x4B
0x4C
0x4D
Bits 0-7 of 18 bits Synthesizer Frequency Selection
Bits 15-8 of 18 bits Synthesizer Frequency Selection
Not used
Bits 17-16 of 18 bits Synthesizer
Frequency Selection
Selects synthesizer frequency value from 1MHz to 156.25MHz, in 1kHz steps, based on which synthesizer
index is selected at register Synth_Index_Select.
This register is not writable for synthesizer F and synthesizer G_T4 since their frequency are fixed. Frequency of
synthesizer F is fixed at 8kHz and 2kHz. Frequency of synthesizer G_T4 is fixed at 2.048MHz.
Default value varies with synthesizer index selection at the register Synth_Index_Select, refer to table below:
Synthesizer Index Selection
Synthesizer G₁
Synthesizer G₂
Associated CLK Output
CLK1
CLK2
Written values less than 1000 or greater than 156250 are invalid.
Synth_Skew_Adj, 0x4E (R/W)
Default Value
155520 (155.52MHz)
38880 (38.88MHz)
Address
Bit7
0x4E
0x4F
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Lower 8 bits of Synthesizer Phase Skew Adjustment
Not used
Higher 4 bits of Synthesizer Phase Skew Adjustment
Preliminary
Page 42 of 56 TM121
Rev:P1.3
© Copyright the Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice
Date: October 24, 2011