DESCRIPTION

The TSB83AA23 is an integrated IEEE Std 1394b-2002 link-layer controller (LLC) design and physical layer (PHY) design combined in a single package to meet the demanding requirements of today's 1394 bus applications. The TSB83AA23 device is capable of exceptional 800-Mbps performance; thus, providing the throughput and bandwidth to move data efficiently and quickly between the PCI and 1394 buses. The TSB83AA23 device also provides outstanding ultralow power operation and intelligent power-management capabilities. The device provides the IEEE 1394 LLC function and PHY function and is compatible with 100-Mbps, 200-Mbps, 400-Mbps, and 800-Mbps serial-bus data rates.

The TSB83AA23 operates as the interface between 33-MHz/32-bit PCI local bus and an IEEE Std 1394a-2000 or IEEE Std 1394b-2002 serial-bus interface. It is capable of supporting serial data rates at 98.304, 196.608, 393.216, 491.52, or 786.432 Mbps (referred to as S100, S200, S400, S400B, or S800 speeds, respectively). When acting as a PCI bus master, the TSB83AA23 device is capable of multiple cache-line bursts of data, which can transfer at 132M bytes/s for 32-bit transfers after connecting to the memory controller. Due to the high throughput potential of the TSB83AA23 device, it possible to encounter large PCI and legacy1394 bus latencies, which can cause the 1394 data to be overrun. To overcome this potential problem, the TSB83AA23 implements deep transmit and receive FIFOs 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 TSB83AA23 LLC section 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 TSB83AA23 LLC section 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. These enhancements include automatic time-stamp 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 time stamp for both DV and audio/video CIP formats. The TSB83AA23 device supports modification of the synchronization time-stamp 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 TSB83AA23 performance and enhanced throughput make it an excellent choice for today's 1394 PC market; however, portable, mobile, and even desktop PC power-management schemes continue to require devices to use less and less power, and TI's 1394 product line has continued to raise the bar by providing the lowest-power 1394 devices in the industry. The TSB83AA23 device represents the next evolution of TI commitment to meet the challenge of power-sensitive applications. The TSB83AA23 device has ultralow operational power requirements and intelligent power-management capabilities that allow it to conserve power autonomously based on the device
usage. The TSB83AA23 LLC section fully supports D0, D1, D2, and D3hot/cold power states, as specified in the PC 2001 Design Guide requirements and the PCI Power Management Specification. PME wake-event support is subject to operating-system support and implementation.

As required by the 1394 Open Host Controller Interface Specification (OHCI) and IEEE Std 1394a-2000, internal control registers are memory mapped and nonprefetchable. The PCI configuration header is accessed through configuration cycles as specified by the PCI Local Bus Specification, and provides plug-and-play (PnP) compatibility. Furthermore, the TSB83AA23 LLC section is fully compliant with the latest PCI Local Bus Specification, PCI Bus Power Management Interface Specification, IEEE Std 1394b-2002, IEEE Std 1394a-2000,
and 1394 Open Host Controller Interface Specification.

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