nSMI*
nSMI
nPME/SCI
nROMOE*
nROMCS *
RD[0:7]*
SOFT
POWER
MANAGEMENT
nPowerOn
Button_In
BIOS
PME/
ACPI
BUFFER
PD0-7
MULTI-MODE
PARALLEL
PORT/FDC
MUX
BUSY, SLCT, PE,
nERROR , nACK
nSTB, nSLCTIN,
POWER
MANAGEMENT
DATA BUS
SER_IRQ
PCI_CLK
nINIT, nALF
SERIAL
IRQ
GP1[0:7]*
GP5[0,2:4]*
GP6[0:7]*
GENERAL
PURPOSE
I/O
ADDRESS BUS
nIOR
nIOW
TXD1
CONFIGURATION
REGISTERS
16C550
COMPATIBLE
SERIAL
RXD1
nDSR1, nDCD1, nRI1, nDTR1
PORT 1
AEN
nCTS1, nRTS1
CONTROL BUS
SA[0:15]
SD[O:7]
IRTX
IRRX
HOST
CPU
WDATA
16C550
COMPATIBLE
SERIAL
DRQ[0:3]
TXD2(IRTX)
WCLOCK
INTERFACE
RXD2(IRRX)
PORT 2 WITH
INFRARED
nDACK[0:3]
SMSC
nDSR2, nDCD2, nRI2, nDTR2
nCTS2, nRTS2
PROPRIETARY
DIGITAL
DATA
TC
82077
SEPARATOR
WITH WRITE
PRECOM-
COMPATIBLE
VERTICAL
IRQ[1,3-12,14]
FLOPPYDISK
CONTROLLER
KCLK
PENSATION
KDATA
RESET_DRV
IOCHRDY
CORE
RCLOCK
RDATA
MCLK
8042
MDATA
P20, P21
P17/P12*
CLK32OUT
DENSEL
nDIR
nINDEX
nTRK0
nDS0,1
CLOCK
GEN
CLOCKI
(14.318)
nMTR0,1
nWDATA nRDATA
nDSKCHG
nWRPRT
nWGATE
DRVDEN0
DRVDEN1
nSTEP
XTAL1
XTAL2
nHDSEL
VCC
VTR
VBAT VSS
*Multi-Function I/O Pin - Optional
FIGURE 2 - FDC37B72x BLOCK DIAGRAM
13
SMSC [ SMSC CORPORATION ]
