LPC47B37X Datasheet, PDF (246/254 Pages) SMSC Corporation – 100 Pin Enhanced Super I/O for LPC Bus with SMBus Controller for Commercial Applications

KCLK/
MCLK
CLK
1
t3 t4
t2
t1
t6
CLK
2
CLK
CLK
CLK
9
10
11
t5
KDAT/ Start Bit Bit 0
MDAT
Bit 7 Parity Bit Stop Bit
FIGURE 31 – KEYBOARD/MOUSE RECEIVE/SEND DATA TIMING
NAME
DESCRIPTION
MIN
t1 Time from DATA transition to falling edge of CLOCK
5
(Receive)
t2 Time from rising edge of CLOCK to DATA transition
5
(Receive)
t3 Duration of CLOCK inactive (Receive/Send)
30
t4 Duration of CLOCK active (Receive/Send)
30
t5 Time to keyboard inhibit after clock 11 to ensure the
>0
keyboard does not start another transmission (Receive)
t6 Time from inactive to active CLOCK transition, used to
5
time when the auxiliary device samples DATA (Send)
TYP
MAX UNITS
25 µsec
T4-5 µsec
50 µsec
50 µsec
50 µsec
25 µsec
246