NXP Semiconductors
UM10858
PN7462 family HW user manual
UM10858
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© NXP B.V. 2018. All rights reserved.
User manual
COMPANY PUBLIC
Rev. 1.4 — 14 May 2018
314514
65 of 345
Name
Address
offset
Width
(bits)
Access
Reset value
Description
CLKGEN_USB_PLL_NDEC_PDE
C_WO_SOFTDEC_REG
0014h
32
R/W
00000000h
PLL N and P decoded divider
ratio when the soft decoder is not
used
7.6.1 PLL Control Register (CLKGEN_USB_PLL_CONTROL_REG - 000Ch)
The CLKGEN_USB_PLL_CONTROL_REG register contains the bits that enable and
connect PLL1. Enabling USB PLL allows it to attempt to lock to the current settings of the
multiplier and divider values. Connecting USB PLL causes the USB subsystem to run
from the USB PLL output clock. The USB PLL must be set up, enabled, and lock
established before it may be used as a clock source for the USB.
Table 57. CLKGEN_USB_PLL_CONTROL_REG (address 000Ch)
Bit
Symbol
Access Value
Description
31
RESERVED
R/W
0x00
Reserved
30
USB_PLL_MNPSEL
R/W
0x00
M,N,P selection values for the Soft Decoder
0: M=600,N=113,P=3
1: M=92,N=13,P=4
29:28
USB_PLL_CLKOUT_SELECT
R/W
0x00
00: USB_PLL output clock 2
01: USB_PLL_clkin
10: tie '0'
11: tie '0'
27:26
USB_PLL_REF_CLK_SELECT
R/W
0x00
Selects the reference clock for USB PLL
00: clk_input_buffer
01: clk_xtal
10: tie '0'
11: tie '0'
25
USB_PLL_LOCK_BYPASS
R/W
0x00
1: Bypass the USB_PLL lock output
24
USB_PLL_MNP_DEC_SELECTIO
N
R/W
0x00
1: M,N,P divider ratio are not coming from the soft
decoder but from the
CLKGEN_USB_PLL_MDEC_WO_SOFTDEC and
CLKGEN_USB_PLL_NDEC_PDEC_WO_SOFTDEC
registers
0: M, N, P divider ratio are taken from the Soft Decoder
23:19
USB_PLL_INSELP
R/W
0x1F
select the bandwidth (don't care if
USB_PLL_BANDSEL='0')
18:15
USB_PLL_INSELI
R/W
0x02
select the bandwidth (don't care if
USB_PLL_BANDSEL='0')
14:11
USB_PLL_INSELR
R/W
0x00
select the bandwidth (don't care if
USB_PLL_BANDSEL='0')
10
USB_PLL_BANDSEL
R/W
0x00
bandwidth adjustment (to modify externally the
bandwidth of the USB_PLL)