nSMI*
nSMI
PME#/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
PORT 2 WITH
INFRARED
DRQ[0:3]
TXD2(IRTX)
WCLOCK
INTERFACE
RXD2(IRRX)
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]
KCLK
FLOPPYDISK
CONTROLLER
PENSATION
KDATA
RESET_DRV
IOCHRDY
MCLK
CORE
8042
RTC
RCLOCK
RDATA
MDATA
P20, P21
P17*
XTAL1,2
VBAT
CLK32OUT
DENSEL
nDIR
nINDEX
nTRK0
nDS0,1
CLOCK
GEN
CLOCKI
(14.318)
nMTR0,1
nWDATA nRDATA
nDSKCHG
nWRPRT
nWGATE
DRVDEN0
DRVDEN1
nSTEP
nHDSEL
Vtr
Vss
Vcc
*Multi-Function I/O Pin - Optional
FIGURE 2 - FDC37B78x BLOCK DIAGRAM
12
SMSC [ SMSC CORPORATION ]
