TMS570LS1114 datasheet(146/169 Pages) TI1

146 / 169 page

TMS570LS1114

SPNS188B – OCTOBER 2012 – REVISED FEBRUARY 2015

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7.11.4 MibSPI/SPI Master Mode I/O Timing Specifications

Table 7-33. SPI Master Mode External Timing Parameters (CLOCK PHASE = 0, SPICLK = output, SPISIMO

= output, and SPISOMI = input)(1)(2)(3)

NO.

Parameter

MIN

MAX

Unit

tc(SPC)M

Cycle time, SPICLK(4)

256tc(VCLK)

2(5)

tw(SPCH)M

Pulse duration, SPICLK high (clock

0.5tc(SPC)M – tr(SPC)M – 3

0.5tc(SPC)M + 3

polarity = 0)

tw(SPCL)M

Pulse duration, SPICLK low (clock

0.5tc(SPC)M – tf(SPC)M – 3

0.5tc(SPC)M + 3

polarity = 1)

3(5)

tw(SPCL)M

Pulse duration, SPICLK low (clock

0.5tc(SPC)M – tf(SPC)M – 3

0.5tc(SPC)M + 3

polarity = 0)

tw(SPCH)M

Pulse duration, SPICLK high (clock

0.5tc(SPC)M – tr(SPC)M – 3

0.5tc(SPC)M + 3

polarity = 1)

4(5)

td(SPCH-SIMO)M

Delay time, SPISIMO valid before

0.5tc(SPC)M – 6

SPICLK low (clock polarity = 0)

td(SPCL-SIMO)M

Delay time, SPISIMO valid before

0.5tc(SPC)M – 6

SPICLK high (clock polarity = 1)

5(5)

tv(SPCL-SIMO)M

Valid time, SPISIMO data valid after

0.5tc(SPC)M – tf(SPC) – 4

SPICLK low (clock polarity = 0)

tv(SPCH-SIMO)M

Valid time, SPISIMO data valid after

0.5tc(SPC)M – tr(SPC) – 4

SPICLK high (clock polarity = 1)

6(5)

tsu(SOMI-SPCL)M

Setup time, SPISOMI before SPICLK

tf(SPC) + 2.2

low (clock polarity = 0)

tsu(SOMI-SPCH)M Setup time, SPISOMI before SPICLK

tr(SPC) + 2.2

high (clock polarity = 1)

7(5)

th(SPCL-SOMI)M

Hold time, SPISOMI data valid after

SPICLK low (clock polarity = 0)

th(SPCH-SOMI)M

Hold time, SPISOMI data valid after

SPICLK high (clock polarity = 1)

8(6)

tC2TDELAY

Setup time CS active

CSHOLD = 0

C2TDELAY*tc(VCLK) + 2*tc(VCLK)

(C2TDELAY+2) * tc(VCLK) -

until SPICLK high

- tf(SPICS) + tr(SPC) – 7

tf(SPICS) + tr(SPC) + 5.5

(clock polarity = 0)

CSHOLD = 1

C2TDELAY*tc(VCLK) + 3*tc(VCLK)

(C2TDELAY+3) * tc(VCLK) -

- tf(SPICS) + tr(SPC) – 7

tf(SPICS) + tr(SPC) + 5.5

Setup time CS active

CSHOLD = 0

C2TDELAY*tc(VCLK) + 2*tc(VCLK)

(C2TDELAY+2) * tc(VCLK) -

until SPICLK low

- tf(SPICS) + tf(SPC) – 7

tf(SPICS) + tf(SPC) + 5.5

(clock polarity = 1)

CSHOLD = 1

C2TDELAY*tc(VCLK) + 3*tc(VCLK)

(C2TDELAY+3) * tc(VCLK) -

- tf(SPICS) + tf(SPC) – 7

tf(SPICS) + tf(SPC) + 5.5

9(6)

tT2CDELAY

Hold time SPICLK low until CS inactive

0.5*tc(SPC)M +

(clock polarity = 0)

T2CDELAY*tc(VCLK) + tc(VCLK) -

tf(SPC) + tr(SPICS) - 7

tf(SPC) + tr(SPICS) + 11

Hold time SPICLK high until CS

0.5*tc(SPC)M +

inactive (clock polarity = 1)

T2CDELAY*tc(VCLK) + tc(VCLK) -

tr(SPC) + tr(SPICS) - 7

tr(SPC) + tr(SPICS) + 11

tSPIENA

SPIENAn Sample point

(C2TDELAY+1) * tc(VCLK) -

(C2TDELAY+1)*tc(VCLK)

tf(SPICS) – 29

tSPIENAW

SPIENAn Sample point from write to

(C2TDELAY+2)*tc(VCLK)

buffer

(1)

The MASTER bit (SPIGCR1.0) is set and the CLOCK PHASE bit (SPIFMTx.16) is cleared.

(2)

tc(VCLK) = interface clock cycle time = 1 / f(VCLK)

(3)

For rise and fall timings, see Table 5-7.

(4)

When the SPI is in Master mode, the following must be true:

For PS values from 1 to 255: tc(SPC)M ≥ (PS +1)tc(VCLK) ≥ 40ns, where PS is the prescale value set in the SPIFMTx.[15:8] register bits.

For PS values of 0: tc(SPC)M = 2tc(VCLK) ≥ 40ns.

The external load on the SPICLK pin must be less than 60pF.

(5)

The active edge of the SPICLK signal referenced is controlled by the CLOCK POLARITY bit (SPIFMTx.17).

(6)

C2TDELAY and T2CDELAY is programmed in the SPIDELAY register

146

Peripheral Information and Electrical Specifications

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