Clock Generator Control Registers

Zynq UltraScale+ Device Technical Reference Manual (UG1085)
Document ID
UG1085
Release Date
2023-12-21
Revision
2.4 English

The clock generator control registers are divided into the following tables:

•AMBA interconnect clocks

•Processors, DDR, and DMA clocks

•LPD and FPD system clocks

•LPD peripheral clocks

•FPD peripheral clocks

Table 37-5:      AMBA Interconnect Clock Control

Register

Reset Value,
Register Set,

Address Offset

Register Parameter

Reset State

Pre-FSBL

Clock Source Options

LPD_LSBUS_CTRL (APB)

0100_1800 h,

LPD 0x0AC

[SRCSEL]:

[DIVISOR0]:

[CLKACT]:

RPLL.

18 h.

Enabled.

 

RPLL, IOPLL, or DPLL_CLK_TO_LPD.

IOU_SWITCH_CTRL (AXI LPD)

0000_1500 h,

LPD 0x09C

[SRCSEL]:

[DIVISOR0]:

[CLKACT]:

RPLL.

15 h.

Disabled.

 

RPLL, IOPLL, or DPLL_CLK_TO_LPD.

LPD_SWITCH_CTRL (AXI LPD)

0100_0500 h,

LPD 0x0A8

[SRCSEL]:

[DIVISOR0]:

[CLKACT]:

RPLL.

05 h.

Enabled.

 

RPLL, IOPLL, or DPLL_CLK_TO_LPD.

TOPSW_LSBUS_CTRL (APB LPD)

0100_0800 h,

FPD 0x0C4

[SRCSEL]:

[DIVISOR0]:

[CLKACT]:

APLL.

08 h.

Enabled.

 

APLL, VPLL, DPLL.

TOPSW_MAIN_CTRL (AXI FPD)

0100_0400 h,

FPD 0x0C0

[SRCSEL]:

[DIVISOR0]:

[CLKACT]:

APLL.

04 h.

Enabled.

 

APLL, VPLL, DPLL.
Table 37-6:      Processors, DDR, and DMA Clock Control

Control Register

Reset Value,
Register Set,
Address Offset

Register Parameter

Reset State

Pre-FSBL

Comments

CPU_R5_CTRL
(RPU MPCore)

0200_0600 h,

0x090

[SRCSEL]

[DIVISOR0]

[CLKACT]

[CLKACT_CORE]

RPLL.

06 h.

Enabled.

Enabled.

 

 

ACPU_CTRL
(APU MPCore)

0300_0400 h,

0x060

[SRCSEL]

[DIVISOR0]

[CLKACT_FULL]

[CLKACT_HALF]

APLL.

04 h.

Enabled.

Enabled.

 

 

CSU_PLL_CTRL

0100_1500 h,

0x0A0

[SRCSEL]

[DIVISOR0]

[CLKACT]

IOPLL.

15 h.

Enabled.

 

 

DDR_CTRL

0100_0500 h,

0x0A0

[SRCSEL]

[DIVISOR0]

DPLL.

05 h.

 

 

FPD_DMA_REF_CTRL

0100_0500 h,

0x0B8

[SRCSEL]

[DIVISOR0]

[CLKACT]

APLL.

05 h.

Enabled.

 

 

LPD_DMA_REF_CTRL

0000_2000 h,

0x0B8

[SRCSEL]

[DIVISOR0]

[CLKACT]

RPLL.

20 h.

Disabled.

 

 

 

 

Table 37-7:      System Clock Control

Register Name

Reset Value,
Address Offset

Register Parameter

Reset State

Pre-FSBL

Comments

DBG_LPD_CTRL

0100_2000h,

LPD 0x068

[SRCSEL]

[DIVISOR0]

[CLKACT]   

RPLL.

020 h.

Enabled.

 

 

DBG_FPD_CTRL

0100_2500 h,

FPD 0x068

[SRCSEL]

[DIVISOR0]

[CLKACT]   

IOPLL_TO_FPD.

025 h.

Enabled.

 

 

DBG_TRACE_CTRL   

0000_2500 h,

FPD 0x064

[SRCSEL]

[DIVISOR0]

[CLKACT]   

IOPLL_TO_FPD.

025 h.

Clock stop.

 

 

DBG_TSTMP_CTRL   

(Timestamp)

0000_0A00 h,

FPD 0x0F8

[SRCSEL]

[DIVISOR0]

IOPLL_TO_FPD.

0A h.

 

The clock enable is controlled by DBG_FPD_CTRL [CLKACT].

AMS_REF_CTRL   

(PS SYSMON unit)

0100_1800 h,

LPD 0x108

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]   

RPLL.

18 h.

0 h.

Enabled.

 

 

DLL_REF_CTRL   

0000_0000h,

LPD 0x104

[SRCSEL]

IOPLL.

 

 

PCAP_CTRL   

0000_1500 h,

LPD 0x0A4

[SRCSEL]

[DIVISOR0]

[CLKACT]   

IOPLL.

15 h.

Disabled.

 

 

TIMESTAMP_REF_CTRL   

0000_1800 h,

LPD 0x128

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]   

IOPLL.

18 h.

0 h.

Disabled.

 

 

PL{0:3}_REF_CTR

0005_2000 h,

LPD 0x0C0 to 0x0CC

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]   

IOPLL.

20 h.

25 h.

Disabled.

 

 

 

Table 37-8:      LPD Peripheral Clock Control

Register Name

Reset Value,
Address Offset

Register Parameter

Reset State

Pre-FSBL

Comments

GEM{0:3}_REF_CTRL

0000_2500 h,

0x050 - 0x05C

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

[RX_CLKACT]

IOPLL.

25 h.

00 h.

Disabled.

Disabled.

 

 

GEM_TSU_REF_CTRL

0005_1000 h,

0x100

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

IOPLL.

10 h.

05 h.

Disabled.

 

 

USB{0,1}_BUS_REF_CTRL

0005_2000 h,

0x060 -0x064

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

IOPLL.

20 h.

05 h.

Disabled.

 

 

UART{0,1}_REF_CTRL

0100_1800 h,

0x074, 0x078

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

IOPLL.

18 h.

00 h.

Enabled.

Same.

N/A

SPI{0, 1}_REF_CTRL

0100_1800 h,

0x07C, 0x080

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

IOPLL.

18 h.

00 h.

Enabled.

Same.

N/A

QSPI_REF_CTRL

0100_0800 h,

0x068

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

IOPLL.

08 h.

00 h.

Enabled.

Same.

0F h.

01 h.

Same.

Quad-SPI boot:

CBR: 0101_0F00 h.

NAND_REF_CTRL

0005_2000 h,

0x0B4

[SRCSEL]
[DIVISOR0]

[DIVISOR1]

[CLKACT]

IOPLL.

20 h.

05 h.

Disabled.

Same.

h.

h.

Same.

NAND boot:

CBR: h.

SDIO{0, 1}_REF_CTRL

0100_0F00 h,

0x06C, 0x070

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

IOPLL.

0F h.

00 h.

Enabled.

Same.

19h.

01 h.

Same.

SD card boot:

CBR: 0101_1900 h.

CAN{0, 1}_REF_CTRL

0100_1800 h,

0x084, 0x088

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

IOPLL.

18 h.

00 h.

Enabled.

Same.

32 h.

00 h.

Same

POR reset:

PMU: 0100_3200 h.

I2C{0, 1}_REF_CTRL

0100_0500 h,

0x120, 0x124

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

IOPLL.

05 h.

00 h.

Enabled.

Same.

N/A

 

Table 37-9:      FPD Peripheral Clock Control

Register Name

Reset Value,
Address Offset

Register Parameter

Reset State

Pre-FSBL

Comments

DP_VIDEO_REF_CTRL

0103_2300 h,

0x070

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

DPLL.

23 h.

0 h.

Enabled.

 

 

DP_AUDIO_REF_CTRL

0103_2300 h,

0x074

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

VPLL.

23 h.

0 h.

Enabled.

 

 

DP_STC_REF_CTRL

0120_3200 h,

0x07C

[SRCSEL]

[DIVISOR0]

[DIVISOR1]

[CLKACT]

VPLL.

32 h.

20 h.

Enabled.

 

 

DPDMA_REF_CTRL

0100_0500 h,

0x0BC

[SRCSEL]

[DIVISOR0]

[CLKACT]

APLL.

05 h.

Enabled.

 

 

GPU_REF_CTRL

0000_1500 h,

0x084

[SRCSEL]

[DIVISOR0]

[CLKACT]

[PP0_CLKACT]

[PP1_CLKACT]

IOPLL_TO_FPD.

15 h.

Disabled.

Disabled.

Disabled.

 

 

PCIE_REF_CTRL

0000_1500 h,

0x0B4

[SRCSEL]

[DIVISOR0]

[CLKACT]

IOPLL_TO_FPD.

15 h.

Disabled.

 

 

SATA_REF_CTRL

0100_1600 h,

0x0A0

[SRCSEL]
[DIVISOR0]

[CLKACT]

IOPLL_TO_FPD.

16 h.

Enabled.