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Table 7-110. PRU_ICSSG PRU Switching Characteristics – Shift Out Mode

see Figure 7-94

NO.

PARAMETER

DESCRIPTION

MIN

MAX

UNIT

PRSO1

tc(CLOCKOUT)

Cycle time, CLOCKOUT

PRSO2L

tw(CLOCKOUTL)

Pulse duration, CLOCKOUT low

0.475P(1)Z(2) -

0.3

PRSO2H

tw(CLOCKOUTH)

Pulse duration, CLOCKOUT high

0.475P(1)Y(3) -

0.3

PRSO3

td(CLOCKOUT-DATAOUT) Delay time, CLOCKOUT to DATAOUT valid

-1

(1)

P = Software programmable shift out clock period, defined by PRUn_GPO_DIV0 and PRUn_GPO_DIV1 bit fields in the

ICSSG_GPCFGn_REG register, where PRUn represents the respective PRU0 or PRU1 instance.

(2)

The Z parameter is defined as follows, where PRUn represents the respective PRU0 or PRU1 instance.

If PRUn_GPI_DIV0 and PRUn_GPI_DIV1 are INTEGERS -or- if PRUn_GPI_DIV0 is a NON-INTEGER and PRUn_GPI_DIV1 is

an EVEN INTEGER then, Z equals (PRUn_GPI_DIV0 * PRUn_GPI_DIV1).

If PRUn_GPI_DIV0 is a NON-INTEGER and PRUn_GPI_DIV1 is an ODD INTEGER then, Z equals (PRUn_GPI_DIV0 *

PRUn_GPI_DIV1 + 0.5).

If PRUn_GPI_DIV0 is an INTEGER and PRUn_GPI_DIV1 is a NON-INTEGER then, Z equals (PRUn_GPI_DIV0 *

PRUn_GPI_DIV1 + 0.5 * PRUn_GPI_DIV0).

If PRUn_GPI_DIV0 and PRUn_GPI_DIV1 are NON-INTEGERS then, Z equals (PRUn_GPI_DIV0 * PRUn_GPI_DIV1 + 0.25 *

PRUn_GPI_DIV0).

(3)

The Y parameter is defined as follows, where PRUn represents the respective PRU0 or PRU1 instance.

If PRUn_GPI_DIV0 and PRUn_GPI_DIV1 are INTEGERS -or- if PRUn_GPI_DIV0 is a NON-INTEGER and PRUn_GPI_DIV1 is

an EVEN INTEGER then, Y equals (PRUn_GPI_DIV0 * PRUn_GPI_DIV1).

If PRUn_GPI_DIV0 is a NON-INTEGER and PRUn_GPI_DIV1 is an ODD INTEGER then, Y equals (PRUn_GPI_DIV0 *

PRUn_GPI_DIV1 - 0.5).

If PRUn_GPI_DIV0 is an INTEGER and PRUn_GPI_DIV1 is a NON-INTEGER then, Y equals (PRUn_GPI_DIV0 *

PRUn_GPI_DIV1 - 0.5 * PRUn_GPI_DIV0).

If PRUn_GPI_DIV0 and PRUn_GPI_DIV1 are NON-INTEGERS then, Y1 equals (PRUn_GPI_DIV0 * PRUn_GPI_DIV1 - 0.25 *

PRUn_GPI_DIV0) and Y2 equals (PRUn_GPI_DIV0 * PRUn_GPI_DIV1 + 0.25 * PRUn_GPI_DIV0), where Y1 is the first high

pulse and Y2 is the second high pulse.

CLOCKOUT

DATAOUT

PRSO1

PRSO2H

PRSO3

PRU_TIMING_06

PRSO2L

Figure 7-94. PRU_ICSSG PRU Shift Out Timing

AM2434, AM2432, AM2431

SPRSP65D – APRIL 2021 – REVISED AUGUST 2022

www.ti.com

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