Stereo System User Manual

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TMS320C6727, TMS320C6726, TMS320C6722
Floating-Point Digital Signal Processors
SPRS268E – MAY 2005 – REVISED JANUARY 2007
Table 4-32. Additional
(1)
SPI Slave Timings, 5-Pin Option
(2) (3)
NO. MIN MAX UNIT
Required delay from SPIx_SCS asserted at slave to first
25 t
d(SCSL_SPC)S
P ns
SPIx_CLK edge at slave.
Polarity = 0, Phase = 0,
0.5t
c(SPC)M
+ P + 10
from SPIx_CLK falling
Polarity = 0, Phase = 1,
P + 10
Required delay from final
from SPIx_CLK falling
26 t
d(SPC_SCSH)S
SPIx_CLK edge before ns
Polarity = 1, Phase = 0,
SPIx_SCS is deasserted.
0.5t
c(SPC)M
+ P + 10
from SPIx_CLK rising
Polarity = 1, Phase = 1,
P + 10
from SPIx_CLK rising
Delay from master asserting SPIx_SCS to slave driving
27 t
ena(SCSL_SOMI)S
P + 10 ns
SPIx_SOMI valid
Delay from master deasserting SPIx_SCS to slave 3-stating
28 t
dis(SCSH_SOMI)S
P + 10 ns
SPIx_SOMI
Delay from master deasserting SPIx_SCS to slave driving
29 t
ena(SCSL_ENA)S
15 ns
SPIx_ENA valid
Polarity = 0, Phase = 0,
2P + 15
from SPIx_CLK falling
Polarity = 0, Phase = 1,
Delay from final clock receive
2P + 15
from SPIx_CLK rising
edge on SPIx_CLK to slave
30 t
dis(SPC_ENA)S
ns
3-stating or driving high
Polarity = 1, Phase = 0,
2P + 15
SPIx_ENA.
(4)
from SPIx_CLK rising
Polarity = 1, Phase = 1,
2P + 15
from SPIx_CLK falling
(1) These parameters are in addition to the general timings for SPI slave modes (Table 4-26 ).
(2) P = SYSCLK2 period
(3) Figure shows only Polarity = 0, Phase = 0 as an example. Table gives parameters for all four slave clocking modes.
(4) SPIx_ENA is driven low after the transmission completes if the SPIINT0.ENABLE_HIGHZ bit is programmed to 0. Otherwise it is
3-stated. If 3-stated, an external pullup resistor should be used to provide a valid level to the master. This option is useful when tying
several SPI slave devices to a single master.
Peripheral and Electrical Specifications88 Submit Documentation Feedback