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| 型號(hào)： | 22450C |
| 英文描述： | MicroManager Chip |
| 中文描述： | 手動(dòng)？lanSC520微控制器的客戶開(kāi)發(fā)平臺(tái)（CDP）的用戶手冊(cè) |
| 文件頁(yè)數(shù)： | 40/78頁(yè) |
| 文件大小： | 1849K |
| 代理商： | 22450C |
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élanSC520 Microcontroller Customer Development Platform User’s Manual
2-8
Super I/O
The ALi Super I/O Chip (Acer Laboratories, Inc., P/N M512x) provides two 16550
compatible UARTs (serial ports) that operate at baud rates up to 1.15 Mbit/s, one
parallel port, a floppy disk interface, IrDA interface (shared with COM4), and a
keyboard/mouse controller.
NOTE:
The two serial ports (COM3 and COM4) of the Super I/O are not the same
as the two serial ports (COM1 and COM2) of the élanSC520 microcontroller.
The two serial ports facilitate software development and other communications.
External transceivers are needed for the serial ports and IrDA interface. LEDs
indicate TX and RX activity on both serial ports. Both serial ports are routed to
industry-standard DB9 and RS-232 connectors on the élanSC520 microcontroller
CDP and are named as COM3 and COM4.
NOTE:
The BIOS included with CDP version 1.4 maps the Super I/O UARTs to
COM3 and COM4. Earlier BIOS versions, used on boards with microcontroller
revisions A0 and A1, disabled the microcontroller’s UARTs and mapped the Super
I/O UARTs to COM1 and COM2 instead.
The EPP-supported parallel port is routed to an industry-standard DB25 connector.
The keyboard and mouse use PS/2 connectors. Table 2-1 shows the DMA channels
and the IRQs for the Super I/O devices. Figure 2-5 on page 2-9 shows the block
diagram of the Super I/O configuration.
Table 2-1. DMA Channels and IRQs Reserved for Super I/O
Devices
DMA Channels Reserved
for Super I/O
IRQs Reserved for Super I/O
FDD
DRQ0/DACK0
IRQ6
EPP (Parallel Port)
DRQ0/DACK0
IRQ7
SIO1
—
IRQ4
SIO2
—
IRQ3
KB (Keyboard)
—
IRQ1
Mouse
—
IRQ12
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