AM2431BSDGHIALVR. datasheet(185/282 Pages) TI2

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Table 6-69. MCSPI Switching Characteristics - Controller Mode

see Figure 6-55

NO.

PARAMETER

MIN

MAX

UNIT

SM1

tc(SPICLK)

Cycle time, SPIn_CLK

SM2

tw(SPICLKL)

Pulse duration, SPIn_CLK low

0.5P - 1

(1)

SM3

tw(SPICLKH)

Pulse duration, SPIn_CLK high

0.5P - 1

(1)

SM6

td(SPICLK-PICO)

Delay time, SPIn_CLK active edge to SPIn_D[x]

-3

2.5

SM7

td(CS-PICO)

Delay time, SPIn_CSi active edge to SPIn_D[x]

SM8

td(CS-SPICLK)

Delay time, SPIn_CSi active to SPIn_CLK first edge

PHA = 0

B - 4(2)

PHA = 1

A - 4(3)

SM9

td(SPICLK-CS)

Delay time, SPIn_CLK last edge to SPIn_CSi inactive

PHA = 0

A - 4(4)

PHA = 1

B - 4(5)

(1)

P = SPI_CLK period in ns.

(2)

T_ref is the period of the McSPI functional clock in ns. Fratio is the divide ratio of McSPI functional clock frequency to SPIn_CLK

clock frequency, controlled by the CLKD and CLKG bit fields in the MCSPI_CH(i)CONF register and the EXTCLK bit field in the

MCSPI_CH(i)CTRL register. TCS(i) is the value programmed into the chip select time control bit field of the MCSPI_CH(i)CONF

•

When Fratio = 1; B = (TCS(i) + 0.5) * T_ref.

•

When Fratio ≥ 2 and even value; B = (TCS(i) + 0.5) * Fratio * T_ref.

•

When Fratio ≥ 3 and odd value; B = ((TCS(i) * Fratio) + ((Fratio + 1) / 2 )) * T_ref.

(3)

T_ref is the period of the McSPI functional clock. Fratio is the divide ratio of McSPI functional clock frequency to SPIn_CLK

clock frequency, controlled by the CLKD and CLKG bit fields in the MCSPI_CH(i)CONF register and the EXTCLK bit field in the

MCSPI_CH(i)CTRL register. TCS(i) is the value programmed into the chip select time control bit field of the MCSPI_CH(i)CONF

•

When Fratio = 1; A = (TCS(i) + 1) * T_ref.

•

When Fratio ≥ 2 and even value; A = (TCS(i) + 0.5) * Fratio * T_ref.

•

When Fratio ≥ 3 and odd value; A = ((TCS(i) * Fratio) + ((Fratio - 1) / 2 )) * T_ref.

(4)

T_ref is the period of the McSPI functional clock. Fratio is the divide ratio of McSPI functional clock frequency to SPIn_CLK

clock frequency, controlled by the CLKD and CLKG bit fields in the MCSPI_CH(i)CONF register and the EXTCLK bit field in the

MCSPI_CH(i)CTRL register. TCS(i) is the value programmed into the chip select time control bit field of the MCSPI_CH(i)CONF

•

When Fratio = 1; A = (TCS(i) + 1) * T_ref.

•

When Fratio ≥ 2 and even value; A = (TCS(i) + 0.5) * Fratio * T_ref.

•

When Fratio ≥ 3 and odd value; A = ((TCS(i) * Fratio) + ((Fratio + 1) / 2 )) * T_ref.

(5)

T_ref is the period of the McSPI functional clock. Fratio is the divide ratio of McSPI functional clock frequency to SPIn_CLK

clock frequency, controlled by the CLKD and CLKG bit fields in the MCSPI_CH(i)CONF register and the EXTCLK bit field in the

MCSPI_CH(i)CTRL register. TCS(i) is the value programmed into the chip select time control bit field of the MCSPI_CH(i)CONF

•

When Fratio = 1; B = (TCS(i) + 0.5) * T_ref.

•

When Fratio ≥ 2 and even value; B = (TCS(i) + 0.5) * Fratio * T_ref.

•

When Fratio ≥ 3 and odd value; B = ((TCS(i) * Fratio) + ((Fratio - 1) / 2 )) * T_ref.

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AM2434, AM2432, AM2431

SPRSP65J – APRIL 2021 – REVISED JUNE 2026

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