Computer Hardware User Manual

System Implementation
1-16
Figure 1–6. Distributed DMA Signal Connection
PCGNT
PCREQ
PCI445X
South
Bridge
(ex., PIIX4)
1.3.5 Requirement of Pullup/Pulldown Resistors
Note:
The PCI445X device has integrated pullup resistors and does not require
external pullups.
Table 1–2.PC Card Interface Pullup Resistor List
†
‡
Terminal Name
(16-bit Memory PC Card)
Terminal Name
(16-bit I/O PC Card)
Terminal Name
(CardBus PC Card)
Pull Up to Voltage
CD1 CD1 CCD1 V
CC
CD2 CD2 CCD2 V
CC
VS1 VS1 CVS1 V
CC
VS2 VS2 CVS2 V
CC
A19 A19 CBLOCK V
CCA
or V
CCB
A20 A20 CSTOP V
CCA
or V
CCB
A21 A21 CDEVSEL V
CCA
or V
CCB
A22 A22 CTRDY V
CCA
or V
CCB
RESET RESET CRST V
CCA
or V
CCB
WAIT WAIT CSERR V
CCA
or V
CCB
RFU INPACK CREQ V
CCA
or V
CCB
BVD2 SPKR CAUDIO V
CCA
or V
CCB
BVD1 STSCHG CSTSCHG V
CCA
or V
CCB
A14 A14 CPERR V
CCA
or V
CCB
READY IREQ CINT V
CCA
or V
CCB
A15 A15 CIRDY V
CCA
or V
CCB
WP IOIS16 CCLKRUN V
CCA
or V
CCB
†
The PCI445X device has integrated pullup resistors and does not require external pullups.
‡
CFRAME
needs a pullup resistor, but it should be implemented on each PC Card.