nPME
PME
SMI
WDT
MULTI-MODE
PD0-7
PARALLEL
PORT/FDC
MUX
BUSY, SLCT, PE,
nERROR, nACK
DATA BUS
SER_IRQ
PCI_CLK
nSTB, nSLCTIN,
nINIT, nALF
SERIAL
IRQ
ADDRESS BUS
nIOR
16C550
COMPATIBLE
SERIAL
CONFIGURATION
REGISTERS
TXD1, nCTS1, nRTS1
nIOW
RXD1
AEN
SA[0:12] (nCS)*
SA[13-15] *
SD[O:7]
PORT 1
nDSR1, nDCD1, nRI1, nDTR1
CONTROL BUS
HOST
CPU
16C550
COMPATIBLE
SERIAL
PORT 2 WITH
INFRARED
WDATA
IRRX, IRTX
INTERFACE
*
TXD2(IRTX), nCTS2, nRTS2
WCLOCK
DRQ[1:3]*
*
RXD2(IRRX)
SMSC
*
nDACK[1:3] *
TC
nDSR2, nDCD2, nRI2, nDTR2
PROPRIETARY
82077
COMPATIBLE
VERTICAL
FLOPPYDISK
CONTROLLER
DIGITAL
DATA
SEPARATOR
WITH WRITE
PRECOM-
PENSATION
RESET_DRV
IOCHRDY
KCLK
KDATA
MCLK
MDATA
CORE
RCLOCK
RDATA
8042
GATEA20, KRESET
*
P12*, P16
CLOCK
GEN
DENSEL
nINDEX
nTRK0
nDS0
nDIR nMTR0
nWDATAnRDATA
nDSKCHG
nWRPRT
nWGATE
VTR Vcc Vss
nSTEP DRVDEN0
*
DRVDEN1
nHDSEL
*
CLK32 CLOCKI
32KHz 14MHz
Denotes Multifunction Pins
FIGURE 1 - FDC37B77x BLOCK DIAGRAM
11
SMSC [ SMSC CORPORATION ]
