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TSB42AA9PZT Fiches technique(PDF) 7 Page - Texas Instruments

No de pièce TSB42AA9PZT
Description  STORAGELYNX 1394 LINK-LAYER CONTROLLER FOR ATA/ATAPI STORAGE PRODUCTS
Download  45 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TSB42AA9PZT Fiches technique(HTML) 7 Page - Texas Instruments

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1 Introduction
1.1
Description
The Texas Instruments TSB42AA9 (StorageLynx) is a 1394 Link Layer Controller designed to function as a native
bridge between the 1394 bus and ATA (AT Attachment) or ATAPI (AT Attachment with Packet Interface) data storage
applications. These data storage devices can include external hard disk drives (HDDs), ZIP drives, magneto-optical
(MO) drives, ORB drives, CD-ROMs, CD-R/Ws, DVD-ROMs, and DVD-RAMs. The ATA/ATAPI interface of the
TSB42AA9 supports signaling and timing for programmed input/output (PIO) modes 0–4, direct memory access
(DMA) modes 0–2, and Ultra DMA modes 0–4. The 1394 interface of StorageLynx is IEEE P1394a[1] and IEEE Std
1394-1995[2] compliant, and it supports 400, 200, and 100 Mbps serial bus data rates.
StorageLynx is particularly designed for any data storage application that supports the SBP–2[3] (Serial Bus Protocol
2) transaction layer as a target device. The TSB42AA9 automates the SBP-2 target controller functions by
implementing the management and command agents in hardware. Data handling is also executed in hardware, with
no assistance from the processor needed to setup a DMA transaction to fetch data from the ATA/ATAPI device and
return it to the SBP-2 initiator via the 1394 bus. StorageLynx translates SBP-2 protocol commands to ATA/ATAPI
commands using the hardware-implemented functions and an embedded 8052 processor executing firmware. The
firmware is located in the internal ROM of the device or optionally, an external memory location.
A 2-wire serial bus interface is included on the TSB42AA9. This interface enables configuration ROM information
required by IEEE Std 1394-1995[2] and SBP-2 to be loaded from a serial EEPROM into the device’s internal parameter
RAM. The internal parameter RAM allows StorageLynx faster access to important configuration information as well
as automatic responses to configuration ROM read requests from the system host. In addition, StorageLynx provides
a memory interface which can be used to access firmware from an external Flash PROM/EPROM for testing and
development purposes, or to support storage applications which require specialized functionality. The StorageLynx
memory interface also supports write operations to the Flash PROM/EPROM, removing the need for parts to be in
sockets and allowing for easy software downloads. Flash memory is not required unless custom functionality and
in-system reprogrammability are requirements.
1.2
Features
Serial bus data rates of 100, 200, and 400 Mbps
IEEE P1394a compliant and IEEE Std 1394-1995
Automated SBP-2 transport protocol engine
ATA/ATAPI command translation by embedded processor and firmware
Programmable ATA/ATAPI interface supporting PIO modes 0–4, DMA modes 0–2, and Ultra DMA modes
0–4
Automated 1394 and SBP-2 header removal and insertion
Internal parameter RAM for fast access to configuration ROM and key SBP-2 parameters
Automatic response to configuration ROM quadlet and block read requests
External flash PROM / EPROM interface for easy program code changes during prototyping
Separate address and data busses for the external flash PROM / EPROM interface (no external latches)
16K internal ROM program memory
576 Byte (128 quadlet) transmit control FIFO, 576 byte (128 quadlet) receive control FIFO
Bidirectional data FIFO
0.18 micron CMOS technology with embedded RAM and ROM
Space-saving 100 pin TQFP package


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