TSB41BA3FTPFPEP datasheet(21/73 Pages) TI

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11 Principles Of Operation (1394b Interface)

The TSB41BA3F-EP is designed to operate with an LLC such as the Texas Instruments TSB82AF15-EP when

the BMODE terminal is tied high. Details of operation for the Texas Instruments LLC devices are found in the

respective LLC data sheets. The following paragraphs describe the operation of the PHY-LLC interface. This

interface is formally specified in the IEEE 1394b-2002 standard.

The interface to the LLC consists of the PCLK, LCLK_PMC, CTL0–CTL1, D0–D7, LREQ, PINT, LPS, and

S5_LKON terminals on the TSB41BA3F-EP, as shown in Figure 11-1.

S5_LKON

LPS

PCLK

LREQ

D0±D7

CTL0±CTL1

Link-Layer

Controller

TSB41BA3F

LCLK_PMC

PINT

Figure 11-1. PHY-LLC Interface

The LCLK_PMC terminal provides a clock signal to the PHY. The LLC derives this clock from the PCLK signal

and is phase-locked to the PCLK signal. All LLC to PHY transfers are synchronous to LCLK_PMC.

The PCLK terminal provides a 98.304-MHz interface system clock. All control, data, and PHY interrupt signals

are synchronized to the rising edge of PCLK.

The CTL0 and CTL1 terminals form a bidirectional control bus, which controls the flow of information and data

between the TSB41BA3F-EP and LLC.

The D0–D7 terminals form a bidirectional data bus, which transfers status information, control information, or

packet data between the devices. The TSB41BA3F-EP supports S400B, S200B, and S100B data transfers over

the D0–D7 data bus. In S400B, S200B, and S100B operation, all Dn terminals are used.

The LREQ terminal is controlled by the LLC to send serial service requests to the PHY in order to request

access to the serial bus for packet transmission, read or write PHY registers, or control arbitration acceleration.

All data on LREQ is synchronous to LCLK_PMC.

The LPS and S5_LKON terminals are used for power management of the PHY and LLC. The LPS terminal

indicates the power status of the LLC, and can be used to reset the PHY-LLC interface or to disable PCLK. The

S5_LKON terminal sends a wake-up notification to the LLC and indicates an interrupt to the LLC when either

LPS is inactive or the PHY register L bit is 0.

The PINT terminal is used by the PHY for the serial transfer of status, interrupt, and other information to the LLC.

The TSB41BA3F-EP normally controls the CTL0–CTL1 and D0–D7 bidirectional buses. The LLC is allowed to

drive these buses only after the LLC has been granted permission to do so by the PHY.

Four operations can occur on the PHY-LLC interface: link service request, status transfer, data transmit, and

data receive. The LLC issues a service request to read or write a PHY register or to request the PHY to gain

control of the serial bus in order to transmit a packet.

The PHY can initiate a status transfer either autonomously or in response to a register read request from the

LLC.

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TSB41BA3F-EP

SLLSFA1 – SEPTEMBER 2020

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