Information Technology Reference
In-Depth Information
Cache
(SRAM)
Control: HCACHE#,
HKEN#, HSMIACT#,
HADS#, HBRDY,
HNA#, HAHOLD,
HEADS#, HBOFF# ,
HCLKTXC, HLOCK#,
HW/R#, HD/C#,
HM/IO#, HHITM#
Control: CCS#,
COE#, CADS#,
CBWE#,CGWE#
CTWE#
CTAG
[10:0]
Parity: MP[7:0]
Data: MD[63:0]
82439HX
System
Controller
(TXC)
Data: HD[63:0]
Main
memory
(DRAM)
Pentium
processor
Address: MA[11:0],
MRAS#[3:0], MCAS#[7:0]
Address: HA[31:0]
Address: HBE#[7:0]
Control: MWE#
Fast IDE
USB
AD[31:0]
C/BE#[3:0]
PCI bus
82371SB
PCI I/O IDE
Xcelerator
(PIIX3)
82091AA
AIP
PIRQ[5:0]
PTRST#, PCLK#, PREQ#[3:0],IRDY#,
DEVSEL#, PLOCK#{3:0], PERR#, SERR#,
ACK64#[3:0], REQ64#[3:0], PAR, SBO#,
FRAME#, PGNT#[3:0]. PCIRST#
2 serial ports
1 parallel port
Floppy disk controller
ISA
bus
Figure 5.1
PCIset system architecture
HA0
HA1
A
A4
D
D1
HD0
HD1
HA30
HA31
A30
A31
D62
D63
HD62
HD63
-HBE0
-BE0
-HBE1
-HBE2
-HBE3
-HBE4
-HBE5
-HBE6
-HBE7
-BE1
-BE2
-BE3
-BE4
-BE5
-BE6
-BE7
-FERR
-HFERR
-BF0
-HBF0
-BF1
-HBF1
-ITM
-HITM
-HBOFF
-BOFF
-HA20M
-HINTR
-HNMI
-HIGNNE
-HKEN
-HFLUSHA
-HAHOLD
-A20
-INTR
-NMI
-IGNNE
-KEN
-FLUSH
AHOLD
-ADS
-HADS
D/-C
-HD/-C
W/-R
-HW/-R
M/-IO
-HM/-IO
-HEADS
-EADS
-HBRDY
-BRDY
HRESET
RESET
HINV
INV
-HBUSCHK
-BUSCHK
Pentium II
Figure 5.2
Pentium II/III connections
