Datasheet

TMS320C28346, TMS320C28345, TMS320C28344
TMS320C28343, TMS320C28342, TMS320C28341
www.ti.com SPRS516D –MARCH 2009–REVISED AUGUST 2012
6.14.2 SPI Slave Mode Timing
Table 6-33 lists the slave mode external timing (clock phase = 0) and Table 6-34 (clock phase = 1).
Figure 6-19 and Figure 6-20 show the timing waveforms.
Table 6-33. SPI Slave Mode External Timing (Clock Phase = 0)
(1) (2) (3) (4) (5)
NO. MIN MAX UNIT
12 t
c(SPC)S
Cycle time, SPICLK 4t
c(LCO)
ns
13 t
w(SPCH)S
Pulse duration, SPICLK high (clock polarity = 0) 0.5t
c(SPC)S
– 10 0.5t
c(SPC)S
ns
t
w(SPCL)S
Pulse duration, SPICLK low (clock polarity = 1) 0.5t
c(SPC)S
– 10 0.5t
c(SPC)S
14 t
w(SPCL)S
Pulse duration, SPICLK low (clock polarity = 0) 0.5t
c(SPC)S
– 10 0.5t
c(SPC)S
ns
t
w(SPCH)S
Pulse duration, SPICLK high (clock polarity = 1) 0.5t
c(SPC)S
– 10 0.5t
c(SPC)S
15 t
d(SPCH-SOMI)S
Delay time, SPICLK high to SPISOMI valid (clock polarity = 0) 20 ns
t
d(SPCL-SOMI)S
Delay time, SPICLK low to SPISOMI valid (clock polarity = 1) 20
16 t
v(SPCL-SOMI)S
Valid time, SPISOMI data valid after SPICLK low 0.75t
c(SPC)S
ns
(clock polarity = 0)
t
v(SPCH-SOMI)S
Valid time, SPISOMI data valid after SPICLK high 0.75t
c(SPC)S
(clock polarity = 1)
19 t
su(SIMO-SPCL)S
Setup time, SPISIMO before SPICLK low (clock polarity = 0) 20 ns
t
su(SIMO-SPCH)S
Setup time, SPISIMO before SPICLK high (clock polarity = 1) 20
20 t
v(SPCL-SIMO)S
Valid time, SPISIMO data valid after SPICLK low 0.5t
c(SPC)S
– 10 ns
(clock polarity = 0)
t
v(SPCH-SIMO)S
Valid time, SPISIMO data valid after SPICLK high 0.5t
c(SPC)S
– 10
(clock polarity = 1)
(1) The MASTER / SLAVE bit (SPICTL.2) is cleared and the CLOCK PHASE bit (SPICTL.3) is cleared.
(2) t
c(SPC)
= SPI clock cycle time = LSPCLK/4 or LSPCLK/(SPIBRR + 1)
(3) Internal clock prescalers must be adjusted such that the SPI clock speed is limited to the following SPI clock rate:
Master mode transmit 25-MHz MAX, master mode receive 12.5-MHz MAX
Slave mode transmit 20-MHz MAX, slave mode receive 20-MHz MAX.
(4) t
c(LCO)
= LSPCLK cycle time
(5) The active edge of the SPICLK signal referenced is controlled by the CLOCK POLARITY bit (SPICCR.6).
Copyright © 2009–2012, Texas Instruments Incorporated Electrical Specifications 137
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