FDC37M81 SMSC [SMSC Corporation], FDC37M81 Datasheet - Page 174

• Manufacturer Part Number: FDC37M81
• Description: PC98/99 Compliant Enhanced Super I/O Controller with Keyboard/Mouse Wake-Up
• Manufacturer: SMSC [SMSC Corporation]

NAME
KDAT/
MDAT
KCLK/
MCLK
t1
t2
t3
t4
t5
t6
Time from DATA transition to falling edge of CLOCK
(Receive)
Time from rising edge of CLOCK to DATA transition
(Receive)
Duration of CLOCK inactive (Receive/Send)
Time to keyboard inhibit after clock 11 to ensure the
keyboard does not start another transmission (Receive)
Time from inactive to active CLOCK transition, used to
time when the auxiliary device samples DATA (Send)
Duration of CLOCK active (Receive/Send)
t1
Start Bit
FIGURE 8 - KEYBOARD/MOUSE RECEIVE/SEND DATA TIMING
CLK
t3
1
t2
t6
t4
Bit 0
CLK
2
DESCRIPTION
174
Bit 7
CLK
9
Parity Bit Stop Bit
CLK
10
MIN
30
30
>0
5
5
5
TYP
t5
CLK
11
MAX
T4-5
25
50
50
50
25
UNITS
µsec
µsec
µsec
µsec
µsec
µsec