Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 4/01/2024
Public

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7.6.3. PSS Clock Group

The PSS clock group includes the clocks required by the PSS NoC and the associated peripherals. The clock manager also contains the CSR bits to control the clock enables that are implemented within the associated peripherals.

Note: There is a new feature that allows the debugger to enable clocks to the CoreSight logic via a signal interface, as well as the register-based enable.

The following figure shows the block diagram for the PSS NoC clock trees and associated peripherals.

Figure 258. PSS NoC Clock Trees Block Diagram

The following table shows the registers used to program the clocks.

Table 292.  Programming Clock Registers
Clock Name *.src *.cnt (n+1 divider) *.div (2^n divider) Clock Gate (enable)
l3_main_free_clk

mainpllgrp.nocclk.src

= 0 (Main_PLL_C3)

= 1 (Peri_PLL_C1)

--- --- ---
l4_main_clk --- mainpllgrp.en.l4mainclken
l4_mp_clk mainpllgrp.nocdiv.l4mpclk mainpllgrp.en.l4mpclken
l4_sp_clk mainpllgrp.nocdiv.l4spclk mainpllgrp.en.l4spclken
l4_sys_free_clk mainpllgrp.nocdiv.l4sysfreeclk ---
SPIM: spim[1,0]_sclk_out l4_main_clk --- --- perpllgrp.en.spim_[1,0]_clken

SPIS:

spis[1,0]_sclk_in

--- --- perpllgrp.en.spis_[1,0]_clken

DMA:

dmac_core_clk, aclk_mi

--- --- perpllgrp.en.dmaclken

DMA:

hs_clk

l4_mp_clk --- --- perpllgrp.en.dmaclken

USB2OTG:

hclk, pmu_hclk, utmi_clk

--- --- perpllgrp.en.usb2clken

I3C:

core_clk

--- --- perpllgrp.en.i3c_[1,0]_clken

I2C:

pclk

l4_sp_clk --- --- perpllgrp.en.i2c_[1,0]_clken

UART:

pclk

--- --- perpllgrp.en.uart_[1,0]_clken

SP TIMER:

pclk

--- --- perpllgrp.en.spitimer_[1,0]_clken