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TSB82AA2BIPGE Fiches technique(PDF) 8 Page - Texas Instruments |
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TSB82AA2BIPGE Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 102 page 1−1 1 Introduction This chapter provides an overview of the Texas Instruments TSB82AA2B device and its features. 1.1 Description The TSB82AA2B OHCI-Lynx™ controller is a discrete 1394b link-layer device, which has been designed to meet the demanding requirements of today’s 1394 bus designs. The TSB82AA2B device is capable of exceptional 800M bit/s performance; thus, providing the throughput and bandwidth to move data efficiently and quickly between the PCI and 1394 buses. The TSB82AA2B device also provides outstanding ultra-low power operation and intelligent power management capabilities. The device provides the IEEE Std 1394 link function and is compatible with 100M bit/s, 200M bit/s, 400M bit/s, and 800M bit/s serial bus data rates. TSB82AA2B improved throughput and increased bandwidth make it ideal for today’s high-end PCs and open the door for the development of S800 RAID- and SAN-based peripherals. The TSB82AA2B OHCI-Lynx controller operates as the interface between a 33-MHz/64-bit or 33-MHz/32-bit PCI local bus and a compatible 1394b physical layer (PHY) device (such as the TSB81BA3 device) that is capable of supporting serial data rates at 98.304M, 196.608M, 393.216M, or 786.432M bit/s (referred to as S100, S200, S400, or S800 speeds, respectively). When acting as a PCI bus master, the TSB82AA2B device is capable of multiple cacheline bursts of data, which can transfer at 264M bytes/s for 64-bit transfers or 132M bytes/s for 32-bit transfers after connecting to the memory controller. Due to the high throughput potential of the TSB82AA2B, it possible to encounter large PCI and legacy 1394 bus latencies, which can cause the 1394 data to be overrun. To overcome this potential problem, the TSB82AA2B implements deep transmit and receive FIFOs (see Section 1.2, Features, for FIFO size information) to buffer the 1394 data, thus preventing possible problems due to bus latency. This also ensures that the device can transmit and receive sustained maximum size isochronous or asynchronous data payloads at S800. The TSB82AA2B device implements other performance enhancements to improve overall performance of the device, such as: a highly tuned physical data path for enhanced SBP-2 performance, physical post writing buffers, multiple isochronous contexts, and advanced internal arbitration. The TSB82AA2B also implements hardware enhancements to better support digital video (DV) and MPEG data stream reception and transmission. These enhancements are enabled through the isochronous receive digital video enhancements register at TI extension offset A80h (see Section 5.4, Isochronous Receive Digital Video Enhancements Register). These enhancements include automatic timestamp insertion for transmitted DV and MPEG-formatted streams and common isochronous packet (CIP) header stripping for received DV streams. The CIP format is defined by the IEC 61883-1:1998 specification. The enhancements to the isochronous data contexts are implemented as hardware support for the synchronization timestamp for both DV and audio/video CIP formats. The TSB82AA2B device supports modification of the synchronization timestamp field to ensure that the value inserted via software is not stale — that is, less than the current cycle timer when the packet is transmitted. The TSB82AA2B performance and enhanced throughput make it an excellent choice for today’s 1394 PC market; however, the portable, mobile, and even today’s desktop PCs power management schemes continue to require devices to use less and less power, and the TI 1394 OHCI-Lynx product line has continued to raise the bar by providing the lowest power 1394 link-layers in the industry. The TSB82AA2B represents the next evolution of TI commitment to meet the challenge of power-sensitive applications. The TSB82AA2B has ultra-low operational power requirements and intelligent power management capabilities that allow it to autonomously conserve power based on the device usage. |
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