LPC47M112_07 SMSC [SMSC Corporation], LPC47M112_07 Datasheet - Page 78

• Manufacturer Part Number: LPC47M112_07
• Description: Enhanced Super I/O Controller with LPC Interface
• Manufacturer: SMSC [SMSC Corporation]

Enhanced Super I/O Controller with LPC Interface
Datasheet
16 STATUS PORT
The Status port is used to indicate the state of the transmit and receive buffers in the MIDI Data port. The Status port
is read-only (Table 35). Status port Bit 6 is MIDI Transmit Busy, Bit 7 is MIDI Receive Buffer Empty. The remaining
bits in the Status port are RESERVED.
Bit 7 – MIDI Receive Buffer Empty
Bit 7 MIDI Receive Buffer Empty indicates the read state of the MIDI Data port (Table 36). If the MRBE bit is ‘0’, MIDI
Read/Command Acknowledge data is available to the host.
Acknowledge data is NOT available to the host.
The MPU-401 Interrupt output is active ‘1’ when the MIDI Receive Buffer Empty bit is ‘0’. The MPU-401 Interrupt
output is inactive ‘0’ when the MIDI Receive Buffer Empty bit is ‘1’. See Section “Interrupt” for more information.
Bit 6 – MIDI Transmit Busy
Bit 6 MIDI Transmit Busy indicates the send (write) state of the MIDI Data port and Command port (Table 37).
There are no interrupts associated with MIDI transmit (write) data.
SMSC DS – LPC47M112
TYPE
BIT
NAME
MPU-401 I/O BASE ADDRESS+1
MIDI RX
EMPTY
BUFFE
D7
R
R
0
1
0
1
STATUS PORT
STATUS PORT
MIDI TX
BUSY
D7
D6
D6
R
Table 36 - MIDI Receive Buffer Empty Status Bit
Table 37 - MIDI Transmit Busy Status Bit
D5
Table 35 - MPU-401 Status Port
R
0
MIDI Read/Command Acknowledge data is
available to the host.
MIDI Read/Command Acknowledge data is
NOT available to the host.
The MPU-401 interface is ready to accept a
data/command byte from the host.
The MPU-401 interface is NOT ready to
accept a data/command byte from the host.
DATASHEET
D4
R
0
Page 78
DESCRIPTION
DESCRIPTION
D3
R
0
If the MRBE bit is ‘1’, MIDI Read/Command
D2
R
0
D1
R
0
D0
R
0
DEFAULT
0x80
Rev. 02-16-07