
Hardware Reference Manual
PMC233/4/5 & PMC243/4/5 High Capacity Disk Solutions
4 Architecture
The
PMC23X/24X
utilizes a single chip solution that interfaces the PCI to the ATA bus. The
PMC23X
is ATA66,
compatible while the
PMC24X
extends the compatibility to ATA100. The
PMC23X
has a 32/33Mhz PCI bus
interface. The
PMC24X
has a 32/66Mhz PCI bus interface. Further, the PCI bus signaling of the
PMC23X
is +5V
only, while the
PMC24X
is +3.3V as well as +5V.
Secondary
Primary IDE
Primary IDE
ATA/
IDE
ATA/
IDE
PCI/IDE Controller
Host PCI
Connection
PCI/IDE Controller
Host PCI
Connection
ATA/
IDE
PMC235, PMC243 & PMC245
PMC233 & PMC234
Each IDE bus (i.e. Primary and Secondary) can have up to two drive units attached. Connecting more than one
drive is constrained by mechanical configuration on each product (see table in the Model Comparison section.)
DDC No. Rx-URMH 090 Rev A
Issued 7 April 2002
18 of 27