LPC47M112-MW datasheet(80/208 Pages) SMSC

80 / 208 page

Enhanced Super I/O Controller with LPC Interface

Datasheet

SMSC DS – LPC47M112

Page 80

Rev. 02/02/2005

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.

Table 35 - MPU-401 Status Port

MPU-401 I/O BASE ADDRESS+1

DEFAULT

TYPE

0x80

BIT

NAME

MIDI RX

BUFFE

EMPTY

MIDI TX

BUSY

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.

If the MRBE bit is ‘1’, MIDI Read/Command

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.

Table 36 - MIDI Receive Buffer Empty Status Bit

STATUS PORT

DESCRIPTION

MIDI Read/Command Acknowledge data is

available to the host.

MIDI Read/Command Acknowledge data is

NOT available to the host.

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.

Table 37 - MIDI Transmit Busy Status Bit

STATUS PORT

DESCRIPTION

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.

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