LPC47M182 SMSC Corporation, LPC47M182 Datasheet - Page 11

• Manufacturer Part Number: LPC47M182
• Description: ADVANCED I/O CONTROLLER WITH MOTHERBOARD GLUE LOGIC
• Manufacturer: SMSC Corporation

Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
Chapter 1
SMSC LPC47M182
The LPC47M182* is a 3.3V (5V tolerant) PC99a/PC2001 compliant Advanced I/O controller for Desktop
PCs. The device, which implements the Low Pin Count (LPC) interface, includes I/O functionality as well
as Motherboard GLUE logic into a 128-pin package. This is space saving solution on the motherboard
resulting in lower cost. The LPC47M182 also provides 13 general purpose pins, which offer flexibility to
the system designer, and two Fan Tachometer Inputs. The LPC47M182’s LPC interface supports LPC I/O
and DMA cycles.
The LPC47M182 includes complete legacy I/O: a keyboard interface; SMSC's true CMOS 765B floppy
disk controller with advanced digital data separator; two 16C550A compatible UARTs; one Multi-Mode
parallel port including ChiProtect circuitry plus EPP and ECP. The true CMOS 765B core provides 100%
compatibility with IBM PC/XT and PC/AT architectures, in addition, it provides data overflow and underflow
protection. The SMSC’s patented advanced digital data separator allows for ease of testing and use. The
parallel port is compatible with IBM PC/AT architecture, as well as IEEE 1284 EPP and ECP. The
LPC47M182 incorporates sophisticated power control circuitry (PCC) which includes support for keyboard
and mouse wake up events as well as PME support. The PCC supports multiple low power-down modes.
The LPC47M182 is ACPI 1.0b/2.0 compatible.
The Motherboard GLUE logic includes various power management logic; including generation of
nRSMRST, Power OK signal generation, 5V main and standby reference generation. There are also three
LEDs to indicate power status and hard drive activity. The translation circuit converts 3.3V signals to 5V
signals. Also included is SMBus main power well to resume power well isolation circuitry.
The LPC47M182 supports the ISA Plug-and-Play Standard register set (Version 1.0a). The I/O Address,
DMA Channel and hardware IRQ of each logical device in the LPC47M182 may be reprogrammed through
the internal configuration registers. There are up to 480 (960 for Parallel Port) I/O address location
options, a Serialized IRQ interface, and three DMA channels. On chip, Interrupt Generating Registers
enable external software to generate IRQ1 through IRQ15 on the Serial IRQ Interface.
The LPC47M182’s Enhanced Digital Data Separator does not require any external filter components and
is therefore easy to use and offers lower system costs and reduced board area. The LPC47M182 is
register compatible with SMSC’s proprietary 82077AA core.
*The “2” at the end of the part number is a designator for particular BIOS used inside the specific chip.
General Description
DATASHEET
11
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)