TABLE OF CONTENTS
FEATURES ....................................................................................................................................... 1
GENERAL DESCRIPTION ................................................................................................................ 2
PIN CONFIGURATION...................................................................................................................... 6
PIN DESCRIPTION........................................................................................................................ 7
H
OST
I
NTERFACE
.............................................................................................................................. 7
FDC FUNCTIONAL DESCRIPTION................................................................................................. 17
FDC87W21 FDC .......................................................................................................................... 17
REGISTER DESCRIPTIONS........................................................................................................ 31
IDE.................................................................................................................................................. 42
IDE D
ECODE
D
ESCRIPTION
.............................................................................................................. 42
UART PORT ................................................................................................................................... 43
U
NIVERSAL
A
SYNCHRONOUS
R
ECEIVER
/T
RANSMITTER
(UART A, UART B) ............................................ 43
R
EGISTER
A
DDRESS
........................................................................................................................ 43
IR P
ORT
........................................................................................................................................ 54
PARALLEL PORT........................................................................................................................... 83
PRINTER INTERFACE LOGIC..................................................................................................... 83
ENHANCED PARALLEL PORT (EPP).......................................................................................... 85
EXTENDED CAPABILITIES PARALLEL (ECP) PORT .................................................................. 89
E
XTENSION
FDD M
ODE
(EXTFDD) .................................................................................................. 98
E
XTENSION
2FDD M
ODE
(EXT2FDD) .............................................................................................. 98
E
XTENSION
A
DAPTER
M
ODE
(EXTADP) (P
ATENT PENDING
) ................................................................. 98
J
OYSTICK
M
ODE
(P
ATENT PENDING
)................................................................................................... 99
GAME PORT DECODER ...............................................................................................................100
PLUG AND PLAY CONFIGURATION ............................................................................................100
EXTENDED FUNCTION REGISTERS ............................................................................................100
E
XTENDED
F
UNCTIONS
E
NABLE
R
EGISTERS
(EFER
S
)..........................................................................101
E
XTENDED
F
UNCTION
I
NDEX
R
EGISTERS
(EFIR
S
), E
XTENDED
F
UNCTION
D
ATA
R
EGISTERS
(EFDR
S
) ........101
B
IT
M
AP
C
ONFIGURATION
R
EGISTERS
...............................................................................................137
SPECIFICATIONS..........................................................................................................................139
A
BSOLUTE
M
AXIMUM
R
ATINGS
..........................................................................................................139
DC CHARACTERISTICS.............................................................................................................139
AC C
HARACTERISTICS
....................................................................................................................141
TIMING WAVEFORMS ..................................................................................................................147
FDC ............................................................................................................................................147
UART/P
ARALLEL
...........................................................................................................................149
M
ODEM
C
ONTROL
T
IMING
................................................................................................................150
P
ARALLEL
P
ORT
.............................................................................................................................151
P
ARALLEL
P
ORT
T
IMING
..................................................................................................................151
EPP D
ATA OR
A
DDRESS
R
EAD
C
YCLE
(EPP V
ERSION
1.9)..................................................................152
EPP D
ATA OR
A
DDRESS
W
RITE
C
YCLE
(EPP V
ERSION
1.9) ................................................................153
EPP D
ATA OR
A
DDRESS
R
EAD
C
YCLE
(EPP V
ERSION
1.7)..................................................................154
4
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