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AM79C970A Arkusz danych(PDF) 2 Page - Advanced Micro Devices |
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AM79C970A Arkusz danych(HTML) 2 Page - Advanced Micro Devices |
2 / 219 page AMD P R E L I M I N A R Y 2 Am79C970A The PCnet-PCI II controller is a complete Ethernet node integrated into a single VLSI device. It contains a bus interface unit, a DMA buffer management unit, an IEEE 802.3-compliant Media Access Control (MAC) function, individual 272-byte transmit and 256-byte receive FIFOs, an IEEE 802.3-compliant Attachment Unit Interface (AUI) and Twisted-Pair Transceiver Media Attachment Unit (10BASE-T MAU) that can both operate in either half-duplex or full-duplex mode. The PCnet-PCI II controller is register compatible with the LANCE (Am7990) Ethernet controller, the C-LANCE (Am79C90) Ethernet controller, the ILACC (Am79C900) Ethernet controller, and all Ethernet controllers in the PCnet Family, including the PCnet-ISA controller (Am79C960), PCnet-ISA+ controller (Am79C961), PCnet-ISA II controller (Am79C961A), PCnet-32 controller (Am79C965), PCnet-PCI controller (Am79970), and the PCnet-SCSI controller (Am79C974). The buffer management unit supports the C-LANCE, ILACC, and PCnet descriptor software models. The PCnet-PCI II controller is software compatible with the Novell® NE2100 and NE1500 Ethernet adapter card architectures. The 32-bit multiplexed bus interface unit provides a di- rect interface to PCI local bus applications, simplifying the design of an Ethernet node in a PC system. The PCnet-PCI II controller provides the complete interface to an Expansion ROM, allowing add-on card designs with only a single load per PCI bus interface pin. With its built-in support for both little and big endian byte align- ment, this controller also addresses proprietary non-PC applications. The PCnet-PCI II controller’s advanced CMOS design allows the bus interface to be connected to either a 5 V or a 3.3 V signaling environ- ment. Both NAND Tree and JTAG test interfaces are provided. The PCnet-PCI II controller supports automatic configuration in the PCI configuration space. Additional PCnet-PCI II configuration parameters, including the unique IEEE physical address, can be read from an ex- ternal non-volatile memory (Microwire EEPROM) im- mediately following system reset. The controller has the capability to automatically select either the AUI port or the Twisted-Pair transceiver. Only one interface is active at any one time. Both network in- terfaces can be programmed to operate in either half- duplex or full-duplex mode. The individual transmit and receive FIFOs optimize system overhead, providing suf- ficient latency during frame transmission and reception, and minimizing intervention during normal network error recovery. The integrated Manchester encoder/decoder (MENDEC) eliminates the need for an external Serial In- terface Adapter (SIA) in the system. The built-in General Purpose Serial Interface (GPSI) allows the MENDEC to be by-passed. In addition, the device provides programmable on-chip LED drivers for trans- mit, receive, collision, receive polarity, link integrity, ac- tivity, or jabber status. The PCnet-PCI II controller also provides an External Address Detection Interface (EADI) to allow fast external hardware address filtering in internetworking applications. For power sensitive applications where low stand-by current is desired, the device incorporates two Sleep functions to reduce over-all system power consumption, excellent for notebooks and Green PCs. In conjunction with these low power modes, the PCnet-PCI II controller also has integrated functions to support Magic Packet, an inexpensive technology that allows remote wake up of Green PCs. |
Podobny numer części - AM79C970A |
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Podobny opis - AM79C970A |
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