UR6HCPS2-SP40 Datasheet, PDF (14/22 Pages) Semtech Corporation – Converts PS/2 Data to Serial or SPI

PROTOCOLS FOR THE UR6HCPS2-SP 40 IN SPI MODE (CON’T)
SPI Communication Timing Parameters
Symbol
t1
t2
t2’
t3
t4
Description
Min
_ATN low to _SS low
_SS low to first clock
50
(_SS toggles for every package)
_ATN low to first clock
50
(_SS low)
Last clock of transmitted
50
byte to next byte’s first clock
Last byte TX finish to
_ATN to high
Max
10
5000
5000
5000
30
Units
ms
us
us
us
us
t2
_ATN
_SS
SCLK
SDATA
1st ^2nd
Byte _Byte
Last
Byte
t3
t4
Figure 3: SPI Packet Transmission Timing: (_SS low always).
Copyright Semtech, 2002-2001
14
DOC6-PS2-SP40-DS-102
www.semtech.com