Visible to Intel only — GUID: sfo1410067675142
Ixiasoft
Visible to Intel only — GUID: sfo1410067675142
Ixiasoft
3.3.4. Hardware Sequenced Clock Groups
The hardware sequenced clock groups consists of the MPU clocks and the NOC clocks. The following diagram shows the external bypass muxes, hardware-managed external counters and dividers, and clock gates. For hardware-managed clocks, the group of clocks has only one software enable for the clock gate. As a result, the group of clocks are all enabled or disabled together. The slight exception is the NOC has two software enables, one for the l3/l4 clocks and one for the CoreSight clocks.
Clock Output Group | System Clock Name | Frequency | Boot Frequency | Uses |
---|---|---|---|---|
MPU | mpu_clk | PLL C0 | boot_clk | MPU subsystem, including CPU0 and CPU1 |
mpu_I2_ram_clk | mpu_clk/2 | boot_clk | MPU level 2 (L2) RAM | |
mpu_periph_clk | mpu_clk/4 | boot_clk | MPU snoop control unit (SCU) peripherals, such as the general interrupt controller (GIC) | |
NOC | l3_main_free_clk | PLL C1 | boot_clk | L3 interconnect |
l4_sys_free_clk | l3_main_free_clk/4 | boot_clk/2 | L4 interconnect | |
l4_sys_free_div4_clk | l4_sys_free_clk/4 | l4_sys_free_clk/4 | L4 interconnect timer reference | |
l4_main_clk | l3_main_free_clk/{1,2,4,8} | boot_clk | L4 main bus | |
l4_mp_clk | l3_main_free_clk/{1,2,4,8} | boot_clk | L4 MP bus | |
l4_sp_clk | l3_main_free_clk/{1,4,8} | boot_clk/2 | L4 SP bus | |
cs_timer_clk | l3_main_free_clk/{1,2,4,8} | boot_clk | Trace timestamp generator | |
cs_at_clk | l3_main_free_clk/{1,2,4,8} | boot_clk | CoreSight debug trace bus | |
cs_pdbg_clk | cs_at_clk/{1,4} | cs_at_clk/2 | Debug Access Port (DAP) and debug peripheral bus | |
cs_trace_clk | cs_at_clk/{1,2,8} | cs_at_clk/4 | Coresight debug Trace Port Interface Unit (TPIU) | |
Main FPGA Reference | h2f_user0_clk | h2f_user0_free_clk | boot_clk | FPGA |