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TSB12LV21B-EP Datasheet(PDF) 2 Page - Texas Instruments |
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TSB12LV21B-EP Datasheet(HTML) 2 Page - Texas Instruments |
2 / 6 page TSB12LV21B-EP SLLA274 – APRIL 2008...................................................................................................................................................................................................... www.ti.com The PCI interface supports 32-bit burst transfers up to 33 MHz and is capable of operating both as a master and as a target device. Configuration registers can be loaded from an external serial EEPROM, allowing board and system designers to assign their own unique identification codes. An autoboot mode allows data-moving systems (such as docking stations) to be designed to operate on the PCI bus without the need for a host CPU. The DMA controller uses packet control list (PCL) data structures to control the transfer of data and allow the DMA to operate without host CPU intervention. These PCLs can reside in PCI memory or in memory that is connected to a local bus port. The PCLs implement an instruction set that allows linking, conditional branching, 1394 data transfer control, auxiliary support commands, and status reporting. Five DMA channels accommodate programmable data types. PCLs can be chained together to form a channel control program that can be developed to support each DMA channel. Data can be stored in either big endian or little endian format, eliminating the need for the host CPU to perform byte swapping. Data can be transferred either to 4-byte aligned locations, to provide the highest performance, or to nonaligned locations, to provide the best memory use. The RAM, ROM, AUX, ZV, and general-purpose I/O (GPIO) ports collectively make up the local bus interface. These ports mapped into the PCI address, can be accessed either through the PCI bus or through internal DMA transactions. Internal transactions do not appear on the external PCI bus, thereby conserving PCI bandwidth. DMA packet control lists or other data may be stored in external RAM or ROM attached to the local bus interface. This further reduces PCI bus use and generally improves performance. The ZV local bus port is designed to transfer data from 1394 video devices to an external device connected to the PCILynx-2 ZV port. This interface provides a method for receiving 1394 digital camera packets directly from a ZV-compliant device attached to the local bus interface. Built-in test registers, a dedicated test output terminal, and four GPIO terminals allow observation of internal states and provide a convenient software debug capability. Programmable interrupts are available to inform driver software of important events, such as 1394 bus resets and DMA-to-PCL transfer completion. The 3.3-V internal operation provides reduced power consumption, while maintaining compatibility with 5-V signaling environments. The PCI interface is compatible with both 3-V and 5-V PCI systems. The TSB12LV21B is characterized for operation over the military temperature range of –55 °C to 125°C. NOTE: For a complete data sheet (literature number SLLS879) or more information, contact support@ti.com. ORDERING INFORMATION(1) TA PACKAGE(2) ORDERABLE PART NUMBER TOP-SIDE MARKING –55 °C to 125°C 176-Pin PQFP PGF TSB12LV21BMPGFEP 12LV21BMPGFEP (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. (2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. 2 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TSB12LV21B-EP |
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