CRITICALITY

Low

DESCRIPTION

When HSDIVIDER1/2 CLKOUT4 (CM_DIV_H14_DPLL_PER/CM_DIV_H24_DPLL_CORE[5:0] DIVHS) configuration is changed between an odd divide value and divide-by-2.5 setting, the clock output could glitch. This could result in unexpected behavior of the peripheral receiving the clock. This case impacts GPU clock.

WORKAROUND

To avoid glitch, the user can always change first to/from an even divider setting, such as divide-by-4, before reconfiguring to divide-by-2.5 or from divide-by-2.5 to an odd divider.

Sequence to switch HSDIVIDER1/2 CLKOUT4 from any odd divider to divide-by-2.5:

• Current divider setting is set to any odd divider
• Change divider setting to any even divider not exceeding maximum frequency for that clock (e.g. divide-by-4)
• Change divider setting to divide-by-2.5

Sequence to switch HSDIVIDER1/2 CLKOUT4 from divide-by-2.5 to any odd divider:

• Current divider setting is set divide-by-2.5
• Change divider setting to any even divider not exceeding maximum frequency for that clock (e.g. divide-by-4)
• Change frequency to the desired odd divider

REVISIONS IMPACTED

AM571x SR 2.1, 2.0, 1.0
AM570x SR 2.1, 2.0

TDA2Ex (23mm): 2.0, 1.0

TDA2Ex (17mm): 2.1, 2.0

AM571x: 2.1, 2.0, 1.0

AM570x: 2.1, 2.0

DRA72x: 2.0, 1.0

DRA71x: 2.1, 2.0