vcocalib 

         VCO calibration control registers.
Module Instance Base Address Register Address
i_clk_mgr_perpllgrp 0xFFD1007C 0xFFD100B4

Size: 32

Offset: 0x38

Access: RW

Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Reserved

clr

RW 0x0

banksel

RW 0x0

Reserved

mscnt

RW 0x1

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Reserved

hscnt

RW 0x5C

vcocalib Fields

Bit Name Description Access Reset
27 clr 
HP PLL calibration clear control.
Assertion of this signal will clear the calibrated analog parameter values stored during cold-start in the calibration bank selected by ictl_pll_cfg_index_a_[1:0]. 
ln other words, this signal will trigger PLL to go through cold start sequence when exiting Power-Down (PD) state the next time the cleared calibration bank is selected. Assertion of this signal is only allowed when PLL is in PD state (all four clock slices are disabled). 
Status signal, octl_pll_clkslice*_status_a, will be de-asserted to indicate the clear request is acknowledged by the HP PLL IP. Users should de-assert ictl_pll_cal_clr_a and wait for assertion of status to indicate the clear event is completed.
RW 0x0
26:25 banksel 
Controls the calibration bank that will be used to store, restore or clear HP PLL calibration code.
0—Select calibration bank 0
1—Select calibration bank 1
2—Select calibration bank 2
3—Select calibration bank 3
 RW 0x0
23:16 mscnt 
ictl_pll_calvcomeascount_nt_[7:0] = 100/(Fvco/Fref_ effective_digital)

Where:
Fref_effective_digital = Fref/(2^ictl_pll_drefdiv_nt_[1:0])
This control can only be set while the HP PLL IP is in Reset or PD state. It cannot be switched dynamically.
0—Divided by 1
1—Divided by 2
2—Divided by 4
Note: The refclkdiv reqister is configured to the Membus interface. Default value is 1.
RW 0x1
9:0 hscnt 
VCO calibration parameter:
ictl_pll_calvcohscount_nt_[9:0] = (ictl_pll_mdiv_a_[9:0](At Reset)) * ictl_pll_calvcomeascount_nt_[7:0] * (2^ictl_pll_drefdiv_nt_[1:0])/ictl_pll_arefdiv_nt_[3:0][5:0] (At Reset)-4.
This control can be only set while the HP PLL IP is at Reset or PD state. It cannot be switched dynamically.
RW 0x5C