3
TABLE OF CONTENTS
FEATURES....................................................................................................................................... 1
GENERAL DESCRIPTION ................................................................................................................ 2
PIN CONFIGURATION...................................................................................................................... 6
DESCRIPTION OF PIN FUNCTIONS ................................................................................................ 7
Buffer Type Descriptions .............................................................................................................. 11
3.3 Volt Operation /5 Volt Tolerance............................................................................................. 12
Pins That Require External Pullup Resistors................................................................................. 13
POWER FUNCTIONALITY.............................................................................................................. 14
VCC Power.................................................................................................................................. 14
VTR Support................................................................................................................................ 14
VBAT Power ................................................................................................................................ 14
Internal PWRGOOD..................................................................................................................... 14
32.768 kHz Trickle Clock Input..................................................................................................... 14
Indication of 32kHz Clock............................................................................................................. 15
Internal Ring Oscillator................................................................................................................. 15
Trickle Power Functionality........................................................................................................... 17
Battery Power Functionality.......................................................................................................... 19
Maximum Current Values............................................................................................................. 19
Power Management Events (PME/SCI) ........................................................................................ 19
FUNCTIONAL DESCRIPTION......................................................................................................... 20
Super I/O Registers...................................................................................................................... 20
Host Processor Interface (LPC).................................................................................................... 20
LPC Interface............................................................................................................................... 20
FLOPPY DISK CONTROLLER........................................................................................................ 25
FDC Internal Registers................................................................................................................. 25
Status Register Encoding............................................................................................................. 39
DMA Transfers............................................................................................................................. 43
Controller Phases......................................................................................................................... 43
Command Set/Descriptions.......................................................................................................... 45
Instruction Set.............................................................................................................................. 48
Data Transfer Commands............................................................................................................ 60
Control Commands...................................................................................................................... 67
Direct Support for Two Floppy Drives ........................................................................................... 74
SERIAL PORT (UART).................................................................................................................... 76
Register Description..................................................................................................................... 76
Programmable Baud Rate Generator (AND Divisor Latches DLH, DLL) ........................................ 85
Effect Of The Reset on Register File............................................................................................. 85
FIFO Interrupt Mode Operation..................................................................................................... 85
FIFO Polled Mode Operation........................................................................................................ 86
Notes On Serial Port Operation.................................................................................................... 90
Ring Wake Filter .......................................................................................................................... 91
INFRARED INTERFACE ................................................................................................................. 92
IR Transmit Pins.......................................................................................................................... 93
PARALLEL PORT........................................................................................................................... 93
IBM XT/AT Compatible, Bi-Directional And EPP Modes............................................................... 95
EPP 1.9 Operation....................................................................................................................... 97
EPP 1.7 Operation....................................................................................................................... 99
Extended Capabilities Parallel Port..............................................................................................101