TSB41AB2PAPG4 datasheet(21/55 Pages) TI1

21 / 55 page

TSB41AB2, TSB41AB2I

IEEE 1394a2000 TWOPORT CABLE

TRANSCEIVER/ARBITER

SLLS424G − JUNE 2000 − REVISED DECEMBER 2004

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

designing with the PowerPAD package (continued)

Other requirements for thermal lands and thermal vias are detailed in PowerPAD Thermally Enhanced Package

Technical Brief, TI literature number SLMA002, available via the TI Web pages beginning at URL

http://www.ti.com.

Figure 12. Example of a Thermal Land for the TSB41AB2PAP PHY

For the TSB41AB2, this thermal land should be grounded to the low impedance ground plane of the device. This

improves not only thermal performance but also the electrical grounding of the device. It is also recommended

that the device ground terminal landing pads be connected directly to the grounded thermal land. The land size

should be as large as possible without shorting device signal terminals. The thermal land may be soldered to

the exposed PowerPAD using standard reflow soldering techniques.

While the thermal land may be electrically floated and configured to remove heat to an external heat sink, it is

recommended that the thermal land be connected to the low-impedance ground plane for the device. More

information may be obtained from the TI application report Recommendations for PHY Layout, TI literature

number SLLA020.

internal register configuration

There are 16 accessible internal registers in the TSB41AB2. The configuration of the registers at addresses 0h

through 7h (the base registers) is fixed, while the configuration of the registers at addresses 8h through Fh (the

paged registers) is dependent upon which one of eight pages, numbered 0 through 7, is currently selected. The

selected page is set in base register 7.

The configuration of the base registers is shown in Table 1, and corresponding field descriptions are given in

Table 2. The base register field definitions are unaffected by the selected page number.

A reserved register or register field (marked as Reserved or Rsvd in register configuration tables) is read as 0,

but is subject to future usage. All registers in pages 2 through 6 are reserved.

Table 1. Base Register Configuration

ADDRESS

BIT POSITION

0000

Physical ID

CPS

0001

RHB

IBR

Gap_Count

0010

Extended (111b)

Num_Ports (00010b)

0011

PHY_Speed (010b)

Rsvd

Delay (0000b)

0100

LCtrl

Jitter (000b)

Pwr_Class

0101

RPIE

ISBR

CTOI

CPSI

STOI

PEI

EAA

EMC

0110

Reserved

0111

Page_Select

Rsvd

Port_Select

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