SmartFusion Customizable System-on-Chip (cSoC)
Revision 10 2-89
Serial Peripheral Interface (SPI) Characteristics
This section describes the DC and switching of the SPI interface. Unless otherwise noted, all output
characteristics given for a 35 pF load on the pins and all sequential timing characteristics are related to
SPI_x_CLK. For timing parameter definitions, refer to Figure 2-48 on page 2-90.
Table 2-101 • SPI Characteristics
Commercial Case Conditions: T
J
= 85ºC, VDD = 1.425 V, –1 Speed Grade
Symbol Description and Condition A2F060 A2F200 A2F500 Unit
sp1 SPI_x_CLK minimum period
SPI_x_CLK = PCLK/2 20 NA 20 ns
SPI_x_CLK = PCLK/4 40 40 40 ns
SPI_x_CLK = PCLK/8 80 80 80 ns
SPI_x_CLK = PCLK/16 0.16 0.16 0.16 µs
SPI_x_CLK = PCLK/32 0.32 0.32 0.32 µs
SPI_x_CLK = PCLK/64 0.64 0.64 0.64 µs
SPI_x_CLK = PCLK/128 1.28 1.28 1.28 µs
SPI_x_CLK = PCLK/256 2.56 2.56 2.56 µs
sp2 SPI_x_CLK minimum pulse width high
SPI_x_CLK = PCLK/2 10 NA 10 ns
SPI_x_CLK = PCLK/4 20 20 20 ns
SPI_x_CLK = PCLK/8 40 40 40 ns
SPI_x_CLK = PCLK/16 0.08 0.08 0.08 µs
SPI_x_CLK = PCLK/32 0.16 0.16 0.16 µs
SPI_x_CLK = PCLK/64 0.32 0.32 0.32 µs
SPI_x_CLK = PCLK/128 0.64 0.64 0.64 µs
SPI_x_CLK = PCLK/256 1.28 1.28 1.28 us
sp3 SPI_x_CLK minimum pulse width low
SPI_x_CLK = PCLK/2 10 NA 10 ns
SPI_x_CLK = PCLK/4 20 20 20 ns
SPI_x_CLK = PCLK/8 40 40 40 ns
SPI_x_CLK = PCLK/16 0.08 0.08 0.08 µs
SPI_x_CLK = PCLK/32 0.16 0.16 0.16 µs
SPI_x_CLK = PCLK/64 0.32 0.32 0.32 µs
SPI_x_CLK = PCLK/128 0.64 0.64 0.64 µs
SPI_x_CLK = PCLK/256 1.28 1.28 1.28 µs
sp4 SPI_x_CLK, SPI_x_DO, SPI_x_SS rise time (10%-90%)
1
4.7 4.7 4.7 ns
sp5 SPI_x_CLK, SPI_x_DO, SPI_x_SS fall time (10%-90%)
1
3.4 3.4 3.4 ns
Notes:
1. These values are provided for a load of 35 pF. For board design considerations and detailed output buffer resistances,
use the corresponding IBIS models located on the Microsemi SoC Products Group website:
http://www.microsemi.com/soc/download/ibis/default.aspx.
2. For allowable pclk configurations, refer to the Serial Peripheral Interface Controller section in the SmartFusion
Microcontroller Subsystem User’s Guide.