User's Manual

34 DRAFT P440 Data Sheet / User Guide
CSn
Clk
MOSI
MISO
8-bit command (0xC2)
Response Byte 1 (MSB) Response Byte 2 (LSB)
Don’t Care
Don’t Care
Don’t Care
Read slave output FIFO byte count
CSn
Clk
MOSI
MISO
8-bit command
Data Byte 1
Data Byte 2
Don’t Care
Don’t Care
Don’t Care
Write to slave input FIFO
Data Byte N
Don’t Care
Fig. 21: Timing diagrams
CSn
CLK
MOSI
MISO
1 0 7
1 0 7
End of a SPI transaction Start of next SPI transaction
t1 t2
t3 t4
t5
t6
t7
Timing
Function
Minimum
t1
CLK high to CLK low (high pulse)
30 ns
t2
CLK low to CLK high (low pulse)
30 ns
t3
CLK rising-edge to CSn rising-edge (inactive)
50 ns
t4
CSn rising-edge (inactive) to CSn falling-edge (active) or time between transactions
60 ns
t5
CSn falling-edge (active) to CLK falling-edge
50 ns
t6
Data setup to CLK rising-edge
12 ns
t7
Data hold from CLK rising-edge
12 ns
Fig. 22: Timing constraints