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TSB43AB22APDT датащи(PDF) 9 Page - Texas Instruments

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номер детали TSB43AB22APDT
подробное описание детали  INTEGRATED 1394A-2000 OHCI PHY/LINK-LAYER CONTROLLER
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

TSB43AB22APDT датащи(HTML) 9 Page - Texas Instruments

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1–1
1 Introduction
This chapter provides an overview of the Texas Instruments TSB43AB22A device and its features.
1.1
Description
The Texas Instruments TSB43AB22A device is an integrated 1394a-2000 OHCI PHY/link-layer controller (LLC)
device that is fully compliant with the PCI Local Bus Specification, the PCI Bus Power Management Interface
Specification, IEEE Std 1394-1995, IEEE Std 1394a-2000, and the 1394 Open Host Controller Interface
Specification. It is capable of transferring data between the 33-MHz PCI bus and the 1394 bus at 100M bits/s, 200M
bits/s, and 400M bits/s. The TSB43AB22A device provides two 1394 ports that have separate cable bias (TPBIAS).
The TSB43AB22A device also supports the IEEE Std 1394a-2000 power-down features for battery-operated
applications and arbitration enhancements.
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 specified by PCI, and it provides plug-and-play (PnP) compatibility. Furthermore, the
TSB43AB22A device is compliant with the PCI Bus Power Management Interface Specification as specified by the
PC 2001 Design Guide requirements. The TSB43AB22A device supports the D0, D1, D2, and D3 power states.
The TSB43AB22A design provides PCI bus master bursting, and it is capable of transferring a cacheline of data at
132M bytes/s after connection to the memory controller. Because PCI latency can be large, deep FIFOs are provided
to buffer the 1394 data.
The TSB43AB22A device provides physical write posting buffers and a highly-tuned physical data path for SBP-2
performance. The TSB43AB22A device also provides multiple isochronous contexts, multiple cacheline burst
transfers, advanced internal arbitration, and bus-holding buffers.
An advanced CMOS process achieves low power consumption and allows the TSB43AB22A device to operate at
PCI clock rates up to 33 MHz.
The TSB43AB22A PHY-layer provides the digital and analog transceiver functions needed to implement a two-port
node in a cable-based 1394 network. Each cable port incorporates two differential line transceivers. The transceivers
include circuitry to monitor the line conditions as needed for determining connection status, for initialization and
arbitration, and for packet reception and transmission.
The TSB43AB22A PHY-layer requires only an external 24.576-MHz crystal as a reference for the cable ports. An
external clock may be provided instead of a crystal. An internal oscillator drives an internal phase-locked loop (PLL),
which generates the required 393.216-MHz reference signal. This reference signal is internally divided to provide the
clock signals that control transmission of the outbound encoded strobe and data information. A 49.152-MHz clock
signal is supplied to the integrated LLC for synchronization and is used for resynchronization of the received data.
Data bits to be transmitted through the cable ports are received from the integrated LLC and are latched internally
in synchronization with the 49.152-MHz system clock. These bits are combined serially, encoded, and transmitted
at 98.304M, 196.608M, or 393.216M bits/s (referred to as S100, S200, or S400 speeds, respectively) as the outbound
data-strobe information stream. During transmission, the encoded data information is transmitted differentially on the
twisted-pair B (TPB) cable pair(s), and the encoded strobe information is transmitted differentially on the twisted-pair
A (TPA) cable pair(s).
During packet reception, the TPA and TPB transmitters of the receiving cable port are disabled, and the receivers
for that port are enabled. The encoded data information is received on the TPA cable pair, and the encoded strobe
information is received on the TPB cable pair. The received data-strobe information is decoded to recover the receive
clock signal and the serial data bits. The serial data bits are resynchronized to the local 49.152-MHz system clock
and sent to the integrated LLC. The received data is also transmitted (repeated) on the other active (connected) cable
ports.


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