PC8245 Datasheet, PDF (4/61 Pages) ATMEL Corporation – Integrated Processor Family

4 PC8245
• Peripheral logic
Peripheral Logic Bus
– Supports various operating frequencies and bus divider ratios
– 32-bit address bus, 64-bit data bus
– Supports full memory coherency
– Decoupled address and data buses for pipelining of peripheral logic bus
accesses
– Store gathering on peripheral logic bus-to-PCI writes
Memory interface
– Supports up to 2 Gbytes of SDRAM memory
– High-bandwidth data bus (32- or 64-bit) to SDRAM
– Programmable timing supporting SDRAM
– Supports 1 to 8 banks of 16-, 64-, 128-, 256-, or 512-Mbit memory devices
– Write buffering for PCI and processor accesses
– Supports normal parity, read-modify-write (RMW), or ECC
– Data-path buffering between memory interface and processor
– Low-voltage TTL logic (LVTTL) interfaces
– 272 Mbytes of base and extended ROM/Flash/PortX space
– Base ROM space supports 8-bit data path or same size as the SDRAM data
path (32- or 64-bit)
– Extended ROM space supports 8-, 16-, 32-bit gathering data path, 32- or 64-
bit (wide) data path
– PortX: 8-, 16-, 32-, or 64-bit general-purpose I/O port using ROM controller
interface with programmable address strobe timing, data ready input signal
(DRDY), and 4 chip selects
32-bit PCI interface
– Operates up to 66 MHz
– PCI 2.2-compliant
– PCI 5.0V tolerance
– Support for dual address cycle (DAC) for 64-bit PCI addressing (master only)
– Support for PCI locked accesses to memory
– Support for accesses to PCI memory, I/O, and configuration spaces
– Selectable big- or little-endian operation
– Store gathering of processor-to-PCI write and PCI-to-memory write
accesses
– Memory prefetching of PCI read accesses
– Selectable hardware-enforced coherency
– PCI bus arbitration unit (five request/grant pairs)
– PCI agent mode capability
– Address translation with two inbound and outbound units (ATU)
– Some internal configuration registers accessible from PCI
Two-channel integrated DMA controller (writes to ROM/PortX not supported)
2171D–HIREL–06/04