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Motherboard design

127

The host bus (the connections between the processor and the TXC) typically runs at 60/66 MHz and the PCI bus typically run at 30/33 MHz.

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]

Pentium processor

Data: HD[63:0]

Address: HA[31:3]

82439HX System Controller (TXC)

Address: MA[11:2], MMAA[1:0], MMAB[1:0], MRAS#[3:0], MCAS#[7:0]

Main memory (DRAM)

Address: HBE#[7:0] Interrupt: HINT

Control: MWE#

AD[31:0]

Fast IDE USB DMA Speaker Reset

82091AA AIP

ISA bus

82371SB PCI I/O IDE Xcelerator (PIIX3)

C/BE#[3:0]

PIRQA, PIRQB, PIRQC, PIRQD

PCICLK, FRAME#, TRDY#, IRDY#, STOP#, DEVSEL#, SERR#, PAR, IDSEL, PHOLD#, PHOLDA#, LOCK#, PREQ#[3:0], PGNT#[3:0], PHLD#

PCI bus

2 serial ports, 1 parallel port Floppy disk controller

HA0

A3

HA1

A4

Figure 11.1

PCIset system architecture.

D0 D1

HD0 HD1

HA30

A30

D62

HD62

HA31

A31

D63

HD63

-HBE0 -HBE1 -HBE2 -HBE3 -HBE4 -HBE5 -HBE6 -HBE7

-BE0 -BE1 -BE2 -BE3 -BE4 -BE5 -BE6 -BE7

-HBOFF -HA20M -HINTR -HNMI -HIGNNE -HKEN -HFLUSHA -HAHOLD -HEADS -HBRDY HRESET HINV -HBUSCHK

-BOFF -A20 -INTR -NMI -IGNNE -KEN -FLUSH AHOLD -EADS -BRDY RESET INV -BUSCHK

-BF0

-HBF0

-BF1

-HBF1

Pentium II

Figure 11.2

Pentium II connections.

  • -

    FERR

  • -

    HFERR

-ADS

-HADS

D/-C

-HD/-C

W/-R

-HW/-R

M/-IO

-HM/-IO

  • -

    ITM

  • -

    HITM

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