Digi NS9750 Manual de usuario descargar pdf (Pagina 74)

SPI timing

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NS9750B-A1 Datasheet 03/2006

SPI timing

SPI AC characteristics are measured with 10pF, unless otherwise noted.

Table 34 describes the values shown in the SPI timing diagrams.

Parm Description Min Max Unit Modes Notes

SPI master parameters

SP0 SPI enable low setup to first SPI CLK out

rising

3*T

BCLK

-10 ns 0, 3 1, 3

SP1 SPI enable low setup to first SPI CLK out

falling

3*T

BCLK

-10 ns 1, 2 1, 3

SP3 SPI data in setup to SPI CLK out rising 30 ns 0, 3

SP4 SPI data in hold from SPI CLK out rising 0 ns 0, 3

SP5 SPI data in setup to SPI CLK out falling 30 ns 1, 2

SP6 SPI data in hold from SPI CLK out falling 0 ns 1, 2

SP7 SPI CLK out falling to SPI data out valid 10 ns 0, 3 6

SP8 SPI CLK out rising to SPI data out valid 10 ns 1, 2 6

SP9 SPI enable low hold from last SPI CLK out

falling

3*T

BCLK

-10 ns 0, 3 1, 3

SP10 SPI enable low hold from last SPI CLK out

rising

3*T

BCLK

-10 ns 1, 2 1, 3

SP11 SPI CLK out high time SP13*45% SP13*55% ns 0, 1, 2, 3 4

SP12 SPI CLK out low time SP13*45% SP13*55% ns 0, 1, 2, 3 4

SP13 SPI CLK out period T

BCLK

*6 ns 0, 1, 2, 3 3

SPI slave parameters

SP14 SPI enable low setup to first SPI CLK in

rising

30 ns 0, 3 1

SP15 SPI enable low setup to first SPI CLK in

falling

30 ns 1, 2 1

SP16 SPI data in setup to SPI CLK in rising 0 ns 0, 3

SP17 SPI data in hold from SPI CLK in rising 60 ns 0, 3

SP18 SPI data in setup to SPI CLK in falling 0 ns 1, 2

SP19 SPI data in hold from SPI CLK in falling 60 ns 1, 2

SP20 SPI CLK in falling to SPI data out valid 20 70 ns 0, 3 6

SP21 SPI CLK in rising to SPI data out valid2070ns1, 26

SP22 SPI enable low hold from last SPI CLK in

falling

15 ns 0, 3 1

Table 34: SPI timing parameters

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 87 88

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