Perpendicular Mode ................................................................................................................................ 56
LOCK....................................................................................................................................................... 57
ENHANCED DUMPREG......................................................................................................................... 57
PARALLEL PORT FLOPPY DISK CONTROLLER .................................................................................................. 58
SERIAL PORT (UART) .............................................................................................................................. 59
REGISTER DESCRIPTION................................................................................................................................ 59
RECEIVE BUFFER REGISTER (RB) ..................................................................................................... 60
TRANSMIT BUFFER REGISTER (TB) ................................................................................................... 60
INTERRUPT ENABLE REGISTER (IER)................................................................................................60
INTERRUPT IDENTIFICATION REGISTER (IIR)................................................................................... 61
FIFO CONTROL REGISTER (FCR) ....................................................................................................... 62
LINE CONTROL REGISTER (LCR) ....................................................................................................... 63
MODEM CONTROL REGISTER (MCR)................................................................................................. 65
LINE STATUS REGISTER (LSR) ........................................................................................................... 65
MODEM STATUS REGISTER (MSR)..................................................................................................... 67
SCRATCHPAD REGISTER (SCR) ......................................................................................................... 67
PROGRAMMABLE BAUD RATE GENERATOR DIVISOR LATCHES .................................................. 67
The Affects of RESET on the UART Registers....................................................................................... 69
FIFO INTERRUPT MODE OPERATION.............................................................................................................. 69
FIFO POLLED MODE OPERATION................................................................................................................... 70
NOTES ON SERIAL PORT FIFO MODE OPERATION.......................................................................................... 72
GENERAL ............................................................................................................................................... 72
TX AND RX FIFO OPERATION.............................................................................................................. 72
INFRARED INTERFACE............................................................................................................................ 72
IRDA SIR/FIR AND ASKIR............................................................................................................................ 73
CONSUMER IR............................................................................................................................................... 73
HARDWARE INTERFACE.................................................................................................................................. 73
IR HALF DUPLEX TURNAROUND DELAY TIME .................................................................................................. 73
PARALLEL PORT...................................................................................................................................... 75
IBM XT/AT COMPATIBLE, BI-DIRECTIONAL AND EPP MODES........................................................... 76
DATA PORT............................................................................................................................................ 76
STATUS PORT ....................................................................................................................................... 76
CONTROL PORT.................................................................................................................................... 77
EPP ADDRESS PORT............................................................................................................................ 78
EPP DATA PORT 0................................................................................................................................. 78
EPP DATA PORT 1................................................................................................................................. 78
EPP DATA PORT 2................................................................................................................................. 78
EPP DATA PORT 3................................................................................................................................. 78
EPP 1.9 OPERATION................................................................................................................................. 78
Software Constraints............................................................................................................................... 79
EPP 1.9 Write.......................................................................................................................................... 79
EPP 1.9 Read.......................................................................................................................................... 79
EPP 1.7 OPERATION................................................................................................................................. 80
Software Constraints............................................................................................................................... 80
EPP 1.7 Write.......................................................................................................................................... 80
EPP 1.7 Read.......................................................................................................................................... 80
EXTENDED CAPABILITIES PARALLEL PORT......................................................................................... 82
Vocabulary............................................................................................................................................... 82
ISA IMPLEMENTATION STANDARD..................................................................................................... 83
Description............................................................................................................................................... 83
Register Definitions ................................................................................................................................. 84
OPERATION ........................................................................................................................................... 89
AUTO POWER MANAGEMENT................................................................................................................ 92
FDC POWER MANAGEMENT .......................................................................................................................... 92
SMSC DS – FDC37N769
Page 4 of 137
Rev. 12/21/2000
SMSC [ SMSC CORPORATION ]
