AM3359, AM3358, AM3357, AM3356, AM3354, AM3352
SPRS717H – OCTOBER 2011 – REVISED MAY 2015
7.12 Multichannel Serial Port Interface (McSPI)
For more information, see the Multichannel Serial Port Interface (McSPI) section of the
AM335x Sitara
Processors Technical Reference Manual
(
7.12.1 McSPI Electrical Data and Timing
The following timings are applicable to the different configurations of McSPI in master or slave mode for
any McSPI and any channel (n).
7.12.1.1 McSPI—Slave Mode
Table 7-80. McSPI Timing Conditions – Slave Mode
PARAMETER
MIN
MAX
UNIT
Input Conditions
t
r
Input signal rise time
5
ns
t
f
Input signal fall time
5
ns
Output Condition
C
load
Output load capacitance
20
pF
Table 7-81. Timing Requirements for McSPI Input Timings—Slave Mode
(see
OPP100
OPP50
NO.
UNIT
MIN
MAX
MIN
MAX
1
t
c(SPICLK)
Cycle time, SPI_CLK
62.5
124.8
ns
0.5P –
0.5P +
0.5P –
0.5P +
2
t
w(SPICLKL)
Typical pulse duration, SPI_CLK low
ns
3.12
3.12
0.5P –
0.5P +
0.5P –
0.5P +
3
t
w(SPICLKH)
Typical pulse duration, SPI_CLK high
ns
3.12
3.12
Setup time, SPI_D[x] (SIMO) valid before SPI_CLK
4
t
su(SIMO-SPICLK)
12.92
12.92
ns
active edge
Hold time, SPI_D[x] (SIMO) valid after SPI_CLK
5
t
h(SPICLK-SIMO)
12.92
12.92
ns
active edge
Setup time, SPI_CS valid before SPI_CLK first
8
t
su(CS-SPICLK)
12.92
12.92
ns
9
t
h(SPICLK-CS)
Hold time, SPI_CS valid after SPI_CLK last edge
12.92
12.92
ns
(1) P = SPI_CLK period.
(2) This timing applies to all configurations regardless of MCSPIX_CLK polarity and which clock edges are used to drive output data and
capture input data.
(3) Pins SPIx_D0 and SPIx_D1 can function as SIMO or SOMI.
Table 7-82. Switching Characteristics for McSPI Output Timings—Slave Mode
(see
OPP100
OPP50
NO.
PARAMETER
UNIT
MIN
MAX
MIN
MAX
Delay time, SPI_CLK active edge to
6
t
d(SPICLK-SOMI)
–4.00
17.12
–4.00
17.12
ns
SPI_D[x] (SOMI) transition
Delay time, SPI_CS active edge to
7
t
d(CS-SOMI)
17.12
17.12
ns
SPI_D[x] (SOMI) transition
(1) This timing applies to all configurations regardless of MCSPIX_CLK polarity and which clock edges are used to drive output data and
capture input data.
(2) Pins SPIx_D0 and SPIx_D1 can function as SIMO or SOMI.
Copyright © 2011–2015, Texas Instruments Incorporated
Peripheral Information and Timings
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