AM1705_1007 Datasheet, PDF (101/156 Pages) Texas Instruments – AM1705 ARM Microprocessor

AM1705
www.ti.com
SPRS657A – FEBRUARY 2010 – REVISED APRIL 2010
Table 6-56. Additional⁽¹⁾ SPI0 Slave Timings, 5-Pin Option^{(2) (3)}
No.
PARAMETER
25 t_{d(SCSL_SPC)S}
Required delay from SPI0_SCS asserted at slave to first
SPI0_CLK edge at slave.
Polarity = 0, Phase = 0,
from SPI0_CLK falling
26 t_{d(SPC_SCSH)S}
Required delay from final
SPI0_CLK edge before
SPI0_SCS is deasserted.
Polarity = 0, Phase = 1,
from SPI0_CLK falling
Polarity = 1, Phase = 0,
from SPI0_CLK rising
Polarity = 1, Phase = 1,
from SPI0_CLK rising
27
t_{ena(SCSL_SOMI)S}
Delay from master asserting SPI0_SCS to slave driving
SPI0_SOMI valid
28
t_{dis(SCSH_SOMI)S}
Delay from master deasserting SPI0_SCS to slave
3-stating SPI0_SOMI
29
t_{ena(SCSL_ENA)S}
Delay from master deasserting SPI0_SCS to slave driving
SPI0_ENA valid
Polarity = 0, Phase = 0,
from SPI0_CLK falling
30 t_{dis(SPC_ENA)S}
Delay from final clock receive
edge on SPI0_CLK to slave
3-stating or driving high
SPI0_ENA. ⁽⁴⁾
Polarity = 0, Phase = 1,
from SPI0_CLK rising
Polarity = 1, Phase = 0,
from SPI0_CLK rising
Polarity = 1, Phase = 1,
from SPI0_CLK falling
MIN
P
0.5t_c(SPC)M + P + 5
P+5
0.5t_c(SPC)M + P + 5
P+5
MAX
UNIT
ns
ns
P + 18.5 ns
P + 18.5 ns
18.5 ns
2.5 P + 18.5
2.5 P + 18.5
ns
2.5 P + 18.5
2.5 P + 18.5
(1) These parameters are in addition to the general timings for SPI slave modes ( Table 6-50 ).
(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) SPI0_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.
No.
1 t_c(SPC)M
2 t_w(SPCH)M
3 t_w(SPCL)M
4
t_{d(SIMO_SPC)M}
5
t_{d(SPC_SIMO)M}
Table 6-57. General Timing Requirements for SPI1 Master Modes⁽¹⁾
PARAMETER
Cycle Time, SPI1_CLK, All Master Modes
Pulse Width High, SPI1_CLK, All Master Modes
Pulse Width Low, SPI1_CLK, All Master Modes
Polarity = 0, Phase = 0,
to SPI1_CLK rising
Delay, initial data bit valid on
SPI1_SIMO to initial edge on
SPI1_CLK ⁽²⁾
Polarity = 0, Phase = 1,
to SPI1_CLK rising
Polarity = 1, Phase = 0,
to SPI1_CLK falling
Polarity = 1, Phase = 1,
to SPI1_CLK falling
Polarity = 0, Phase = 0,
from SPI1_CLK rising
Delay, subsequent bits valid
on SPI1_SIMO after transmit
edge of SPI1_CLK
Polarity = 0, Phase = 1,
from SPI1_CLK falling
Polarity = 1, Phase = 0,
from SPI1_CLK falling
Polarity = 1, Phase = 1,
from SPI1_CLK rising
MIN
greater of 2P or 20 ns
0.5t_c(SPC)M - 1
0.5t_c(SPC)M - 1
MAX
UNIT
256P ns
ns
ns
5
- 0.5t_c(SPC)M + 5
ns
5
- 0.5t_c(SPC)M + 5
5
5
ns
5
5
(1) P = SYSCLK2 period
(2) First bit may be MSB or LSB depending upon SPI configuration. MO(0) refers to first bit and MO(n) refers to last bit output on
SPI1_SIMO. MI(0) refers to the first bit input and MI(n) refers to the last bit input on SPI1_SOMI.
Copyright © 2010, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications 101
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