TSB41BA3A

· Fully Supports Provisions of IEEE 1394b-2002 at S100, S100B, S200, S200B, S400, and S400B Signaling Rates (B Signifies 1394b Signaling)
· Fully Supports Provisions of IEEE 1394a-2000 and 1394-1995 Standards for High Performance Serial Bus
· Fully Interoperable With Firewire, DTVLink, SB1394, DishWire, and i.LINK Implementation of IEEE Std 1394 · Provides Three Fully Backward Compatible, (1394a-2000 Fully Compliant) Bilingual 1394b Cable Ports at 400 Megabits per Second (Mbits/s)
· Same Three Fully Backward Compatible Ports Are 1394a-2000 Fully Compliant Cable Ports at 100/200/400 Mbits/s · Full 1394a-2000 Support Includes: − Connection Debounce − Arbitrated Short Reset − Multispeed Concatenation − Arbitration Acceleration − Fly-By Concatenation − Port Disable/Suspend/Resume − Extended Resume Signaling for Compatibility With Legacy DV Devices
· Power-Down Features to Conserve Energy in Battery Powered Applications
 · Low-Power Automotive Sleep Mode Support
· Fully Compliant With Open Host Controller Interface (OHCI) Requirements
· Cable Power Presence Monitoring
 · Cable Ports Monitor Line Conditions for Active Connection to Remote Node
· Register Bits Give Software Control of Contender Bit, Power Class Bits, Link Active Control Bit, and 1394a-2000 Features
· Data Interface to Link-Layer Controller Pin Selectable From 1394a-2000 Mode (2/4/8 Parallel Bits at 49.152 MHz) or 1394b Mode (Eight Parallel Bits at 98.304 MHz)
 · Interface to Link-Layer Controller Supports Low Cost Texas Instruments Bus-Holder Isolation
· Interoperable With Link-Layer Controllers Using 3.3-V Supplies
· Interoperable With Other 1394 Physical Layers (PHYs) Using 1.8-V, 3.3-V, and 5-V Supplies
· Low Cost 49.152-MHz Crystal Provides Transmit and Receive Data at 100/200/400 Mbits/s and Link-Layer Controller Clock at 49.152 MHz and 98.304 MHz
· Separate Bias (TPBIAS) for Each Port
· Low Cost, High Performance 80-Pin TQFP (PFP) Thermally Enhanced Package
· Software Device Reset (SWR)
· Fail-Safe Circuitry Senses Sudden Loss of Power to the Device and Disables the Ports to Ensure That the TSB41BA3A Does Not Load the TPBIAS of Any Connected Device and Blocks Any Leakage From the Port Back to Power Plane
· The TSB41BA3A Has a 1394a-2000 Compliant Common-Mode Noise Filter on the Incoming Bias Detect Circuit to Filter Out Cross-Talk Noise
· Cable/Transceiver Hardware Speed and Port Mode Are Selectable by Pin States
· Supports Connection to CAT5 Cable Transceiver by Allowing Ports to be Forced to Beta-Only 100 Mbits/s only
· Supports Connection to S200 Plastic Optical Fiber Transceivers by Allowing Ports to be Forced to 1394b Beta-Only 200 Mbits/s and S100 Mbits/s Only
· Optical Signal Detect Input for All Ports in Beta Mode Enables Connection to Optical Transceivers
· Supports Use of 1394a Connectors by Allowing Ports 1 and 2 to Be Forced to 1394a-Only Mode

The TSB41BA3A provides the digital and analog transceiver functions needed to implement a three-port node in a cable-based IEEE 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 TSB41BA3A is designed to interface with a link-layer controller (LLC), such as the TSB82AA2, TSB12LV21, TSB12LV26, TSB12LV32, TSB42AA4, TSB42AB4, TSB12LV01B, or TSB12LV01C. It may also be connected cable port to cable port to an integrated 1394 Link + PHY layer such as the TSB43AB2.

The TSB41BA3A is powered by a single 3.3-V supply. The core voltage supply is supplied by an internal voltage regulator to the PLLVDD-CORE and DVDD-CORE terminals. To protect the phase-locked loop (PLL) from noise, the PLLVDD-CORE terminals must be separately decoupled from the DVDD-CORE terminals. The PLLVDD-CORE terminals are decoupled with 1-F and smaller decoupling capacitors and the DVDD-CORE terminals are separately decoupled with a 1-F and smaller decoupling capacitors. The separation between DVDD-CORE and PLLVDD-CORE must be implemented by separate power supply rails or planes.

 The TSB41BA3A may be powered by dual supplies, a 3.3-V supply for I/O and a core voltage supply. The core voltage supply is supplied to the PLLVDD-CORE and DVDD-CORE terminals to the requirements in the recommended operating conditions section of this data sheet. The PLLVDD-CORE terminals must be separated from the DVDD-CORE terminals, the PLLVDD-CORE terminals are decoupled with 1-F and smaller decoupling capacitors and the DVDD-CORE terminals separately decoupled with 1-F and smaller decoupling capacitors. The separation between DVDD-CORE and PLLVDD-CORE may be implemented by separate power supply rails, or by a single power supply rail, where the DVDD-CORE and PLLVDD-CORE are separated by a filter network to keep noise from the PLLVDD-CORE supply.

The TSB41BA3A requires an external 49.152-MHz crystal to generate a reference clock. The external clock drives an internal phase-locked loop (PLL), which generates the required reference signal. This reference signal provides the clock signals that control transmission of the outbound encoded information. A 49.152-MHz clock signal is supplied by the PHY to the associated LLC for synchronization of the two devices and is used for resynchronization of the received data when operating the PHY-link interface in compliance with the IEEE 1394a-2000 standard. A 98.304-MHz clock signal is supplied by the PHY to the associated LLC for synchronization of the two devices when operating the PHY-link interface in compliance with the IEEE 1394b-2002 standard. The power down (PD) function, when enabled by asserting the PD terminal high, stops operation of the PLL.

Data bits of the TSB41BA3A to be transmitted through the cable ports are received from the LLC on 2, 4, or 8 parallel paths (depending on the requested transmission speed and PHY-link interface mode of operation). They are latched internally, combined serially, encoded, and transmitted at 98.304, 122.78, 196.608, 245.76, 393.216, or 491.52 Mbits/s (referred to as S100, S100B, S200, S200B, S400, or S400B speed, respectively) as the outbound information stream.