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參數(shù)資料
| 型號： | PC87393F-VJG |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | 100-Pin LPC SuperI/O Devices for Portable Applications |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP100 |
| 封裝： | TQFP-100 |
| 文件頁數(shù)： | 4/148頁 |
| 文件大?。?/td> | 1733K |
| 代理商： | PC87393F-VJG |
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6.0 Musical Instrument Digital Interface (MIDI) Port (Continued)
101
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6.2.9
Enhanced MIDI Port Features
The MIDI Port supports the following modes/operations, which are not part of the Legacy definition of the MIDI Port:
q
Transmit in Pass-Thru
q
Loopback mode
q
MIDI Thru
q
MDTX pin masking
Transmit in Pass-Thru. When the MIDI Port is operated in Pass-Thru mode, transmit is disabled by default. To enable it,
write 1 to bit 4 of the MCNTL register.
Loopback Mode. The MIDI serial data transmit signal is routed internally to the MIDI serial data receive signal. This causes
all the data transmitted by the MIDI Port to also be received. Loopback mode can be used as a mode for testing the MIDI
Port or its software. To enable it, write 1 to bit 7 of the MCNTL register.
MIDI Thru. The MIDI serial data receive signal is routed internally to the MIDI serial data transmit signal. This causes any
incoming stream of pulses received via the MDRX pin to be driven immediately on the MDTX pin. This feature allows the
MIDI Port to be connected as a link in a chain of several MIDI devices. In parallel to routing the MIDI receive signal to the
MIDI transmit signals, the incoming serial data is also received by the MIDI Port itself. To enable it, write 1 to bit 6 of the
MCNTL register.
MDTX Pin Masking. MDTX pin masking forces this pin to remain at a high level. This causes all transmit processes to occur
without physically driving the serial data via the MDTX pin. Writing 1 to bit 2 of the MCNTL register enables MDTX pin mask-
ing.
The above three features are handled by the MIDI Signals Routing Control Logic, which is illustrated in Figure 20.
Figure 20. MIDI Signals Routing Control Logic
MDTX Pin
MDRX Pin
MIDI
Transmit
Signal
MIDI
Receive
Signal
Loopback
Mode
Enable
MIDI Thru
Enable
MDTX Pin
Masking
Enable
0
1
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| PC87393VJG | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:IC, SUPER I/O DEVICE, TQFP-100, Logic Device Type:Buffer, Supply Voltage Min:3V, |
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