Table 6-1 defines the maximum operating frequency of the clocks for each device speed grade
and Table 6-2 defines the only valid Operating Performance Points (OPPs) for the device
subsystem and core clocks.
Table 6-1 Device Speed Grades
Speed Grade |
MAXIMUM OPERATING FREQUNCY (MHz) |
MAXIMUM TRANSITION RATE (MT/s)(1) |
A53SS (Cortex-A53x) |
MAIN_SYSCLK0 |
PER_SYSCLK0 |
WKUP_SYSCLK0 |
DDR4 |
LPDDR4 |
| E |
833 |
500 |
400 |
400 |
1600 |
1600 |
| O |
1250 |
500 |
400 |
400 |
1600 |
1600 |
(1) Maximum DDR Frequency will be
limited based on the specific memory type (vendor) used in a system and by PCB
implementation. Refer to
DDR Board Design and Layout Guidelines for the proper PCB implementation to achieve maximum DDR
frequency.
Table 6-2 Device Operating Performance
Points
| OPP |
A53SS(1) |
FIXED OPERATING FREQUENCY OPTIONS
(MHz) |
MT/s(4) |
| MAIN_SYSCLK0(2) |
PER_SYSCLK0(3) |
WKUP_SYSCLK0(2) |
DDR4 |
LPDDR4 |
| High |
From ARM0 PLL Bypass to Speed Grade Maximum |
500 |
400 |
400 |
Speed Grade Maximum |
From 250 (DRAM DLL Off Mode) (5) to Speed Grade Maximum |
(1) Initial operating frequency, set
by software at boot. Supports Dynamic Frequency Scaling (DFS) after boot.
(2) Initial operating frequency, set
by software at boot. Run-time support for frequency change between initial
operating frequency and PLL Bypass
(3) Fixed operating frequency, set by software at boot.
(4) Maximum DDR Frequency will be
limited based on the specific memory type (vendor) used in a system and by PCB
implementation. Refer to
DDR Board Design and Layout Guidelines for the proper PCB implementation to achieve maximum DDR
frequency.
(5) The DDR PLL output, which sources
DDR0_CK0 and DDR0_CK0_n, is typically defined in units of frequency. So the
"DRAM DLL Off Mode" transaction rate is equal to 2x the DDR PLL output frequency
when operating in bypass mode.