
SMSC LPC47B27x
- 5 -
Rev. 08-10-04
DATASHEET
PARALLEL PORT....................................................................................................................................................75
IBM
XT/AT
COMPATIBLE,
BI-DIRECTIONAL
AND
EPP
MODES
..................................................................76
EXTENDED
CAPABILITIES
PARALLEL
PORT
.................................................................................................80
PARALLEL PORT FLOPPY DISK CONTROLLER...........................................................................................91
FDC SWAP BIT
..........................................................................................................................................................91
FLOPPY ON PARALLEL PORT PIN....................................................................................................................93
POWER MANAGEMENT.......................................................................................................................................94
SERIAL IRQ
..............................................................................................................................................................97
TIMING DIAGRAMS FOR SER_IRQ CYCLE....................................................................................................97
8042 KEYBOARD CONTROLLER DESCRIPTION.........................................................................................100
L
ATCHES
O
N
K
EYBOARD AND
M
OUSE
IRQ
S
..........................................................................................................106
K
EYBOARD AND
M
OUSE
PME
G
ENERATION
..........................................................................................................107
GENERAL PURPOSE I/O.....................................................................................................................................109
GPIO
P
INS
.............................................................................................................................................................109
EITHER
EDGE
TRIGGERED
INTERRUPTS
..................................................................................................114
LED
FUNCTIONALITY
.......................................................................................................................................114
WATCH
DOG
TIMER
..........................................................................................................................................114
SYSTEM MANAGEMENT INTERRUPT (SMI)................................................................................................115
PME SUPPORT.......................................................................................................................................................117
‘WAKE
ON
SPECIFIC
KEY’
OPTION
...............................................................................................................118
FAN SPEED CONTROL AND MONITORING..................................................................................................120
F
AN
S
PEED
C
ONTROL
...........................................................................................................................................120
F
AN
T
ACHOMETER
I
NPUTS
....................................................................................................................................121
SECURITY FEATURE ..........................................................................................................................................124
GPIO
D
EVICE
D
ISABLE
R
EGISTER
C
ONTROL
.......................................................................................................124
D
EVICE
D
ISABLE
R
EGISTER
..................................................................................................................................124
GAME PORT LOGIC ............................................................................................................................................124
P
OWER
C
ONTROL
R
EGISTER
................................................................................................................................126
VREF
P
IN
..............................................................................................................................................................126
ISA IRQ TO SERIAL IRQ CONVERSION CAPABILITY...............................................................................127
RUNTIME REGISTERS........................................................................................................................................128
CONFIGURATION ................................................................................................................................................151
OPERATIONAL DESCRIPTION.........................................................................................................................168
MAXIMUM
GUARANTEED
RATINGS*
............................................................................................................168
DC
ELECTRICAL
CHARACTERISTICS
..........................................................................................................168
TIMING DIAGRAMS
..............................................................................................................................................171