Functional Description
4.3.5
SDRAM Paging Policy
Open page arbitration is a paging policy which leaves pages open when handing off ownership of
DRAM among masters, and places no restrictions on the number of rows which may have open
pages at any given time.
Features include:
1) Pipelined arbitration allows row/bank/page operations for next cycle to occur while current
DRAM access is performed.
2) Maintaining 2, or 4 banks open at once, in up to 8 rows at a time.
4.4
4.5
PCI Interface
The 82443BX Host Bridge provides a PCI bus interface that is compliant with the PCI Local Bus
Specification, Revision 2.1. The implementation is optimized for high-performance data streaming
when the 82443BX is acting as either the target or the initiator on the PCI bus. The 82443BX
supports the conventional PCI interface referred to as PCI and AGP/PCI interface referred to as
AGP for PCI transactions and AGP for PCI transactions using the AGP enhanced protocols. AGP
cycles using the enhanced protocols are non-snoopable cycles targeted at DRAM.
AGP Interface
The 82443BX Host Bridge provides a AGP bus interface that is compliant with the A.G.P. Interface
Specification, Revision 1.0. The 82443BX supports AGP/PCI interface referred to as AGP for PCI
transactions and AGP for PCI transactions using the AGP enhanced protocols.
4-24
82443BX Host Bridge Datasheet
ETC [ ETC ]
