PC87108 [NSC]
Advanced UART and Infrared Controller; 先进UART和红外控制器
| 型号： | PC87108 |
| 厂家： | 
National Semiconductor |
| 描述： | Advanced UART and Infrared Controller |
| 文件： | 总2页 (文件大小：73K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ADVANCE INFORMATION
November 1995
PC87108
Advanced UART and Infrared Controller
General Description
Features
Y
Fully compatible with 16550 and 16450 devices
The PC87108 is a serial communications device with infra-
red capability. It supports 6 modes or operation and is back-
ward compatible with the 16550 and 16450. The operational
modes are: UART, Sharp-IR, IrDA 1.0 SIR, IrDA 1.1 MIR and
FIR, and Consumer Remote Control (commonly referred to
as TV Remote).
Y
Enhanced UART mode
Y
Sharp-IR with selectable internal or external
modulation
Y
IrDA 1.0 SIR with up to 115.2 kbps data rate
Y
IrDA 1.1 MIR and FIR with 1.152 and 4.0 Mbps data
rates
Two methods are provided to access the internal registers:
an internal 16-bit address decoder, or an externally generat-
ed chip select in combination with an internal 4-bit address
decoder are used to generate the internal register select.
When the internal 16-bit address decoder is used, any one
of four PC COMM port legacy addresses can be selected as
the base address.
Y
Consumer remote control mode
Y
UART mode baud rates up to 1.5 Mbps
Y
Back-to-back infrared frame transmission and reception
Y
Full duplex infrared capability for diagnostics
Y
Transmit deferral
Y
Automatic fallback to 16550 compatibility mode
In order to support existing legacy software using the 16550
UART, the PC87108 provides a special fallback mechanism
that automatically switches the device to 16550 compatibil-
ity mode when the standard baud generator divisor registers
are accessed.
Y
IrDA modes pipelining
Y
Selectable 16 or 32 level FIFOs
Y
Multiple optical transceiver support
Y
Automatic or manual transceiver configuration
Y
12-bit timer for infrared protocol support
The device architecture has been optimized to meet the
requirements of a variety of UART and infrared based appli-
cations. DMA support for all operational modes has been
incorporated into the architecture. Routing for interrupt and
DMA handshake signals is provided to meet Plug-and-Play
as well as PC’95 requirements.
Y
4 general purpose I/O pins
Y
Interrupt signal routing to 1 of 7 output pins
Y
DMA handshake signal routing for either 1 or 2
channels
Y
Full 16-bit address decode
The device can use either 1 or 2 DMA channels. One chan-
nel is required for infrared based applications since infrared
communications work in half duplex fashion. Two channels
would normally be needed to handle high-speed full duplex
UART based applications.
Y
Selectable base address or chip select mode
Y
Power management support
Y
3.3V and 5V operation
Y
ISA compatible interface
Y
80-pin PQFP or TQFP package
To further ease driver design and simplify the implementa-
tion of infrared protocols, a 12-bit timer with 1 ms resolution
has also been included.
Block Diagram
TL/XX/0249–1
C
1996 National Semiconductor Corporation
TL/XX/0249
RRD-B30M66/Printed in U. S. A.
1.0 Pin Description
1.1 CONNECTION DIAGRAM
TL/XX/0249–2
FIGURE 1-2. Connection Diagram for the PC87108 in a Plastic Quad Flatpak, EIAJ
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