Information Technology Reference
In-Depth Information
Floppy disk
interface
Secondary serial
port interface
Primary serial
port interface
Parallel port
interface
82091AA (API)
Address
lines
Data
lines
ISA
handshaking
Interrupt
lines
DMA
Figure 5.3
API IC
AD[31:0]
C/BE#[3:0]
DSKCHG#
SIDE1#
LA[23:17]
DD[15:0]
Control lines
IDE
Disk
drive
FRAME#
FRAME#
TRDY#
IRDY#
STOP#
DEVSEL#
SERR#
FDDEN
SA[10:0]
SD[7:0]
OWS#
IOCHRDY
AEN
XIOW#
XIOR#
T/C
IRQ[15:0]
DRQ[7:0]
DACK#[7:0]
RSTDRV
RI1#
CTS1#
HD[63:0]
Secondary
serial
port
PHOLD#
HA[31:0]
PHLDA#
HFERR
#
EXTSM
I#
DCD1#
TXC
HBE#[7:0]
PIIX3
RI0#
CTS0#
Control
PCIRST#
PIRQ[3:0]
PGNT[1
:0]
Primary
serial
port
DCD0#
PREQ[3
:0]
HINTR
HSMI#
HSTPC
HI
GNNG#
IOCS16#, IOC
HK#
PD[7:0]
STR#
MEMR#, ME
MW#
BALE, MEM
CS16
REFRESH#,
SYSCLK
Parallel
port
SMEMW#, S
MEMR#
SMEMR#,
SLCT
AIP
Figure 5.4
Connections between TXC, PIIX3 and AIP
