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AM79C978AKCW Datenblatt(PDF) 2 Page - Advanced Micro Devices |
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AM79C978AKCW Datenblatt(HTML) 2 Page - Advanced Micro Devices |
2 / 256 page 2 Am79C978A — RX frame queuing for high latency PCI bus host operation — Programmable allocation of buffer space between RX and TX queues n Extensive programmable internal/external loopback capabilities n EEPROM interface supports jumperless design and provides through-chip programming — Supports full programmability of half-/full- duplex operation through EEPROM mapping — Programmable PHY reset output pin capable of resetting external PHY without the need for buffering n Extensive programmable LED status support n Look-Ahead Packet Processing (LAPP) data handling technique reduces system overhead by allowing protocol analysis to begin before the end of a receive frame n Includes Programmable Inter Packet Gap (IPG) to address less network aggressive MAC controllers n Offers the Modified Back-Off algorithm to address the Ethernet Capture Effect n IEEE 1149.1-compliant JTAG Boundary Scan test access port interface and NAND tree test mode for board-level production connectivity test n Software compatible with AMD’s PCnet™ Family and LANCE/C-LANCE register and descriptor architecture n Very low power consumption n +3.3 V power supply along with 5 V tolerant I/Os enable broad system compatibility n Available in 144-pin TQFP and 160-pin PQFP packages GENERAL DESCRIPTION The Am79C978A controller is the first in a series of home networking products from AMD. The Am79C978A controller is fabricated in an advanced low power 3.3 V CMOS process to provide low operating current for power sensitive applications. The Am79C978A controller contains an Ethernet Con- troller based on the Am79C971 Fast Ethernet control- ler, a physical layer device for supporting the 802.3 standard for 10BASE-T, and a physical layer device for data networking at speeds up to 1 Mbps over ordinary residential telephone wiring. The integrated PCI Ethernet controller is a highly inte- grated 32-bit full-duplex, 10/100 Mbps Ethernet con- troller solution designed to address high-performance system application requirements. It is a flexible bus- mastering device that can be used in any application, including network ready PCs. The bus master architec- ture provides high data throughput and low CPU and system bus utilization. The integrated Ethernet transceiver is a physical layer device suppor ting the IEEE 802.3 standards for 10BASE-T. It provides all of the PHY layer functions required to support 10 Mbps data transfer speeds. The integrated HomePNA transceiver is a physical layer device that enables data networking at speeds up to 1 Mbps over common residential phone wiring re- gardless of topology and without disrupting telephone (POTS) service. The 32-bit multiplexed bus interface unit provides a di- rect interface to the PCI local bus, simplifying the de- sign of an Ethernet or home network node in a PC system. The device has built-in support for both little and big endian byte alignment. The integrated home networking controller’s advanced CMOS design allows the bus interface to be connected to either a +5.0 V or a +3.3 V signaling environment. A compliant IEEE 1149.1 JTAG test interface for board level testing is also provided, as well as a NAND tree test structure for those systems that do not support the JTAG interface. The integrated Am79C978A home networking controller is also compliant with the PC98, PC99, and Net PC spec- ifications. It includes the full implementation of the Mi- crosoft OnNow and ACPI specifications, which are backward compatible with Magic Packet technology, and is compliant with the PCI Bus Power Management Inter- face specification by supporting the four power manage- ment states (D0, D1, D2, and D3), the optional PME pin, and the necessary configuration and data registers. The integrated Am79C978A home networking control- ler is a complete Ethernet or home network node inte- grated into a single VLSI device. It contains a bus interface unit, a Direct Memory Access (DMA) Buffer Management Unit, an ISO/IEC 88023 (IEEE 802.3) compliant Media Access Controller (MAC), a Transmit FIFO and a large Receive FIFO, and an IEEE 802.3u compliant MII. Both IEEE 802.3 compliant full-duplex and half-duplex operations are supported on the MII in- terface. 10/100 Mbps operation is supported through the MII interface. The integrated Am79C978A home networking control- ler is register compatible with the LANCE (Am7990) and C-LANCE (Am79C90) Ethernet controllers and all Ethernet controllers in the PCnet Family (except ILACC™ ( A m79 C 900) ) , inc l udin g PCn e t- ISA (Am79C960), PCnet-ISA+ (Am79C961), PCnet-ISA II (Am79C961A), PCnet-32 (Am79C965A), PCnet-PCI (Am79C970), PCnet-PCI II (Am79C970A), PCnet- |
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