tirfil / vhdspislave

SPI slave mode 0

vhdSPISlave

SPI slave in mode 0

signals:

• MCLK : main clock
• nRST : reset active low
• SS : chip select active low (input)
• MISO : master in slave out (output)
• SCK : serial clock (input)
• MOSI : master out slave in (input)
• POUT : parallel out (output) 8 bit (master -> slave)
• PIN : parallel in (input) 8 bit (slave -> master)
• RDYOUT : data valid on POUT (output)
• RDYIN : data on PIN could change (output)
• ID : first byte on POUT (output) (to use with RDYOUT signal)

example : SPI LEDs management

serial format:

ID (8bit)	value (8 bit)

ID	Comment	LEDs operation
00h	clear all leds	00
01h	set leds	OR value
02h	reset leds	AND NOT(value)
03h	toggle leds	XOR value
10h	force leds value	value