Table 14.165. 0x0322 N2 Divider Update Bit
Reg Address Bit Field Type Setting Name Description
0x0322 0 S N2_UPDATE Must write a 1 to this bit to cause N2 divider changes to
take effect.
Table 14.166. 0x032D N3 Divider Update Bit
Reg Address Bit Field Type Setting Name Description
0x032D 0 S N3_UPDATE Must write a 1 to this bit to cause N3 divider changes to
take effect.
Table 14.167. 0x0338 All N Dividers Update Bit
Reg Address Bit Field Type Setting Name Description
0x0338 1 S N_UPDATE Writing a 1 to this bit will update all N dividers to the
latest value written to them. A specific N divider that has
not been changed will not be affected by writing a 1 to
this bit. When this bit is written to a 1, all other bits in
this byte should only be written to a 0.
Table 14.168. 0x0339 FINC/FDEC Masks
Reg Address Bit Field Type Setting Name Description
0x0339 3:0 R/W N_FSTEP_MSK 0 to enable FINC/FDEC updates
1 to disable FINC/FDEC updates
• Bit 0 corresponds to MultiSynth N0 N_FSTEP_MSK 0x0339[0]
• Bit 1 corresponds to MultiSynth N1 N_FSTEP_MSK 0x0339[1]
• Bit 2 corresponds to MultiSynth N2 N_FSTEP_MSK 0x0339[2]
• Bit 3 corresponds to MultiSynth N3 N_FSTEP_MSK 0x0339[3]
There is one mask bit for each of the four N dividers.
Table 14.169. 0x033B-0x0340 N0 Frequency Step Word
Reg Address Bit Field Type Setting Name Description
0x033B 7:0 R/W N0_FSTEPW 44-bit Integer Number
0x033C 15:8 R/W N0_FSTEPW
0x033D 23:16 R/W N0_FSTEPW
0x033E 31:24 R/W N0_ FSTEPW
0x033F 39:32 R/W N0_ FSTEPW
0x0340 43:40 R/W N0_ FSTEPW
This is a 44-bit integer value which is directly added (FDEC) or subtracted (FINC) from the Nx_NUM parameter when FINC or FDEC
is asserted. ClockBuilder Pro calculates the correct values for the N0 Frequency Step Word. Each N divider has the ability to add or
subtract up to a 44-bit value. The Nx_NUM register value does not change when an FINC or FDEC is performed so that the starting
point of Nx_NUM is in the Nx_NUM register.
Si5341, Si5340 Rev D Family Reference Manual • Register Map
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
104 Rev. 1.3 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 26, 2021 104
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