82443BX Datasheet, PDF (4/132 Pages) Intel Corporation – Host Bridge/Controller

The I/O subsystem portion of the Intel^® 440BX AGPset platform is based on the 82371EB
(PIIX4E), a highly integrated version of the Intel’s PCI-ISA bridge family. The Intel^® 440BX
AGPset is ideal for the Mobile AGPset Pentium II processor platforms; providing full support
for all system suspend modes and segmented power planes.
Intel 82443BX Simplified Block Diagram
A[31:3]#
ADS#
BPRI#
BNR#
CPURST#
DBSY#
DEFER#
HD[63:0]#
HIT#
HITM#
HLOCK#
HREQ[4:0]#
HTRDY#
DRDY#
RS[2:0]#
RASA[5:0]/CSA[5:0]#
RASB[5:0]/CSB[5:0]#
CKE[3:2]/CSA[7:6]#
CKE[5:4]/CSB[7:6]#
CASA[7:0]/DQMA[7:0]
CASB[5,1]/DQMB[5,1]
GCKE/CKE1
SRAS[B,A]#
CKE0/FENA
SCAS[B,A]#
MAA[13:0]
MAB[13,12#,11#,10,9#:0#]
WEA#
WEB#
MD[63:0]
MECC[7:0]
HCLKIN
PCLKIN
GTLREF[B:A]
AGPREF
VTT[B:A]
REF5V
PCIRST#
CRESET#
BREQ0#
TESTIN#
GCLKO
GCLKIN
DCLKO
DCLKWR
Host
Interface
DRAM
Interface
Clocks,
Reset,
Test,
and
Misc.
PCI Bus
Interface
(PCI #0)
AGP
Interface
Power
Mgnt
AD[31:0]
C/BE[3:0]#
FRAME#
TRDY#
IRDY#
DEVSEL#
PAR
SERR#
PLOCK#
STOP#
PHOLD#
PHLDA#
WSC#
PREQ0#
PREQ[4:1]#
PGNT0#
PGNT[4:1]#
GAD[31:0]
GC/BE[3:0]#
GFRAME#
GIRDY#
GTRDY#
GSTOP#
GDEVSEL#
GREQ#
GGNT#
GPAR
PIPE#
SBA[7:0]
RBF#
STOP#
ST[2:0]
ADSTB_A
ADSTB_B
SBSTB
CLKRUN#
SUSTAT#
BXPWROK
BX_BLK.VSD
iv
82443BX Host Bridge Datasheet