Major Chips Description 2-3
UMA (unified memory architecture)
Dedicated UMA arbiter pins
Supports several protocols from major graphics vendors
SFB size : 512KB/1MB/2MB/3MB/4MB
CPU could access frame buffer memory through system memory controller
Alias address for frame buffer memory
Fully synchronous 25/30/33 MHz 5V PCI interface
PCI bus arbiter: five PCI masters and M1523 supported
Dwords for CPU-to-PCI Memory write posted buffers
Convert back-to-back CPU to PCI memory write to PCI burst cycle
DWORDS for PCI-to-DRAM write-posted/read-prefetching buffers
PCI-to-DRAM up to 133 MB/sec bandwidth (even when L1/L2 write-back)
L1/L2 pipelined snoop ahead for PCI-to-DRAM cycle
Supports PCI mechanism #1 only
PCI spec. 2.1 support. [N(16/8)+8 rule, passive release, fair arbitration]
Enhanced performance for memory-read-line, memory-read-multiple, and
memory-write-multiple
Invalidates PCI commands
DRAM refresh during 5V system suspend
I/O leakage stopper for power saving during system suspend
328-pin or 388-pin BGA process