NEC POWERMATE PROFESSIONAL 9000 Service Manual page 25

Table 1-2 System Board Feature Components
Chip
82371AB PCI ISA IDE Xcelerator
(PIIX4)
Technical Information
Function
Accelerated Graphics Port Interface:
Complies with AGP specification
Supports 3.3 V AGP devices with data
transfer rates up to 532 MB/sec
Synchronous coupling to the host-bus
frequency
Fully-synchronous PCI bus interface:
Complies with PCI specification
PCI-to-DRAM access greater than 100
MB/sec
Supports five PCI bus masters in addition
to the host and PCI-to-ISA I/O bridge
Delayed transactions
Data Buffering:
Host-to-DRAM, PCI-to-DRAM, and
AGP-to-DRAM write-data buffering
Write-combining for host-to-PCI burst
writes
Supports concurrent host, PCI, and AGP
transactions to main memory
Supports system management mode (SMM)
Multifunction PCI-to-ISA bridge:
Supports the PCI bus at 33 MHz
Complies with PCI specification
Full ISA bus support
USB controller:
Two USB ports
Supports legacy keyboard and mouse
Supports UHCI Design Guide, revision 1.1
interface
1-7