TSB14AA1A_15 Datasheet, PDF (1/7 Pages) Texas Instruments – 3.3-V IEEE 1394-1995 Backplane PHY

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3.3-V IEEE 1394-1995 Backplane PHY
TSB14AA1A
TSB14AA1AI
TSB14AA1AT
SLLA222 – JUNE 2006
FEATURES
• Provides a Backplane 1394 Environment That
Supports an Asynchronous Transfer Rate of
50 or 100 Mbits/s Across 2 Etches
• Single 3.3-V Supply Operation With 5-V
Tolerance on the Transceiver Receive
Interface
• Allows Utilization of 3-State Drivers as Well
as Open-Collector Drivers
• Software Compatible With the TSB14CO1APM
• Enhanced Compatibility With the 1394 Cable
Link Layer. Compatible With 1394–1995 and
1394a–2000 Link Layers; PHY/link Interface is
1394a Compliant¹
• Supports Provisions of IEEE 1394–1995²³
• Extensive Testability and Debug Functions
Added. Expanded Register Set Including
Automatic Saving of ID and Priority for Last
Node Winning Arbitration
• 100 MHz or 50 MHz Oscillator Provides
Transmit, Receive Data, and Link Layer
Controller (LLC) Clocks
• Logic Performs System Initialization
Arbitration Functions. Encode And Decode
Functions Included for Data-Strobe Bit Level
Encoding. Incoming Data Resynchronized to
Local Clock.
• Operates Over the Extended Temperature
Ranges of 0°C to 70°C (no suffix), –40°C to
85°C (I suffix), and –40°C to 105°C (T suffix)
• Packaged in the Very Compact 48-Pin 7 x 7 x
1 mm PFB Package
(1) _{IEEE Std 1394a–2000, IEEE Standard for a High}
Performance Serial Bus – Amendment 1
(2) _{IEEE Std 1394–1995, IEEE Standard for a High Performance}
Serial Bus
(3) _{Implements technology covered by one or more patents of}
Apple Computer, Inc. and ST Microelectronics.
DESCRIPTION
The TSB14AA1A (TSB14AA1A refers to all three devices: TSB14AA1A, TSB14AA1AI, and TSB14AA1AT) is the
second-generation 1394 backplane physical layer device. It is recommended for use in all new designs instead
of the first generation TSB14C01A. It provides the physical layer functions needed to implement a single port
node in a backplane based 1394 network. The TSB14AA1A provides two pins for transmitting, two for receiving,
and two pins to externally control the transceivers for data and strobe. In addition to supporting open-collector
drivers, the TSB14AA1A can also support 3-state⁽¹⁾ (high-impedance) drivers. The TSB14AA1A is not designed
to drive the backplane directly; this function must be provided externally. The TSB14AA1A is designed to
interface with a link-layer controller (LLC), such as the TSB12LV01B, TSB12LV32, TSB12LV21B, etc.
The TSB14AA1A requires an external 98.304-MHz reference oscillator input for S100 asynchronous only
operation or 49.152-MHz for S50 asynchronous only operation. Two clock select pins (CLK_SEL0, CLK_SEL1)
select the speed mode for the TSB14AA1A. For S100 operation, the 98.304-MHz reference signal is internally
divided to provide the 49.152-MHz system clock signals used to control transmission of the outbound encoded
strobe and data information. The 49.152-MHz clock signal is also supplied to the associated LLC for
synchronization of the two chips and is used for resynchronization of the received data. For S50 operation, a
49.152-MHz reference signal is used. This reference signal is internally divided to provide the 24.576-MHz
system clock signals for S50 operations.
During packet transmit, data bits to be transmitted are received from the LLC on two parallel paths and are
latched internally in the TSB14AA1A in synchronization with the system clock. These bits are combined serially,
encoded, and transmitted as the outbound data-strobe information stream. During transmit, the encoded data
information is transmitted on TDATA, and the encoded strobe information is transmitted on TSTRB.
(1) 3-State means a driver may drive high, low, or may be placed in a high-impedance state
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated