LPC47M140-NC SMSC [SMSC Corporation], LPC47M140-NC Datasheet - Page 198

• Manufacturer Part Number: LPC47M140-NC
• Description: 128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB
• Manufacturer: SMSC [SMSC Corporation]

Note: The MIDI bit clock is 31.25kHz +/- 1%
SMSC DS – LPC47M14X
NAME
NAME
KDAT/
MDAT
KCLK/
MCLK
t1
t2
t3
t4
t5
t6
t1
MIDI_Tx
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)
MIDI Data Bit Time
Data
Duration of CLOCK active (Receive/Send)
t1
Start Bit
CLK
t3
FIGURE 43 – KEYBOARD/MOUSE RECEIVE/SEND DATA TIMING
1
Start Bit
Idle (No Data)
t2
t6
t4
Bit 0
CLK
2
DESCRIPTION
DESCRIPTION
FIGURE 44 – MIDI DATA BYTE
t1
Page 198
CLK
Bit 7
Data
Data
9
Parity Bit
CLK
10
31.7
MIN
MIN
30
30
>0
5
5
5
TYP
TYP
32
Idle (No Data)
Stop Bit
t5
CLK
11
Stop Bit
MAX
MAX
T4-5
32.3
25
50
50
50
25
UNITS
UNITS
µsec
µsec
µsec
µsec
µsec
µsec
µsec
Rev. 03/19/2001