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TSB41AB2 Datenblatt(PDF) 7 Page - Texas Instruments

Teilenummer TSB41AB2
Bauteilbeschribung  IEEE 1394a-2000 TWO-PORT CABLE TRANSCEIVER/ARBITER
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TSB41AB2 Datenblatt(HTML) 7 Page - Texas Instruments

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TSB41AB2, TSB41AB2I
IEEE 1394a2000 TWOPORT CABLE
TRANSCEIVER/ARBITER
SLLS424G − JUNE 2000 − REVISED DECEMBER 2004
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
TYPE
I/O
DESCRIPTION
NAME
NO.
TYPE
I/O
DESCRIPTION
AGND
32, 33, 39,
48, 49, 50
Supply
Analog circuit ground terminals. These terminals should be tied together to the low impedance
circuit board ground plane.
AVDD
30, 31, 42,
51, 52
Supply
Analog circuit power terminals. A combination of high-frequency decoupling capacitors near each
terminal are suggested, such as paralleled 0.1
µF and 0.001 µF. Lower frequency 10-µF filtering
capacitors are also recommended. These supply terminals are separated from PLLVDD and
DVDD inside the device to provide noise isolation. They should be tied at a low-impedance point
on the circuit board.
C/LKON
19
CMOS
I/O
Bus manager contender programming input and link-on output. On hardware reset, this terminal
is used to set the default value of the contender status indicated during self-ID. Programming is
done by tying the terminal through a 10-k
Ω resistor to a high (contender) or low (not contender).
The resistor allows the link-on output to override the input. However, it is recommended that this
terminal should be programmed low, and that the contender status be set via the C register bit.
If the TSB41AB2 is used with an LLC that has a dedicated terminal for monitoring LKON and also
setting the contender status, then a 1-k
Ω series resistor should be placed on the LKON line
between the PHY and LLC to prevent bus contention.
Following hardware reset, this terminal is the link-on output, which is used to notify the LLC to
power up and become active. The link-on output is a square-wave signal with a period of
approximately 163 ns (8 SYSCLK cycles) when active. The link-on output is otherwise driven low,
except during hardware reset when it is high-impedance.
The link-on output is activated if the LLC is inactive (LPS inactive or the LCtrl bit cleared) and
when:
a) the PHY receives a link-on PHY packet addressed to this node, or
b) the PEI (port-event interrupt) register bit is 1, or
c) any of the CTOI (configuration-time-out interrupt), CPSI
(cable-power-status interrupt), or STOI (state-time-out interrupt)
register bits are 1 and the RPIE (resuming-port interrupt enable)
register bit is also 1.
Once activated, the link-on output continues active until the LLC becomes active (both LPS active
and the LCtrl bit set). The PHY also deasserts the link-on output when a bus reset occurs unless
the link-on output would otherwise be active because one of the interrupt bits is set (that is, the
link-on output is active due solely to the reception of a link-on PHY packet).
NOTE: If an interrupt condition exists which would otherwise cause the link-on output to be
activated if the LLC were inactive, the link-on output is activated when the LLC subsequently
becomes inactive.
CNA
3
CMOS
O
Cable-not-active output. This terminal is asserted high when there are no ports receiving
incoming bias voltage. CNA is not valid at initial power up, until a device hard reset is performed.
CPS
24
CMOS
I
Cable power status input. This terminal is normally connected to cable power through a 400-k
resistor. This circuit drives an internal comparator that is used to detect the presence of cable
power. This terminal should be tied directly to DGND through a 1-k
Ω resistor if application does
not require it to be used.
CTL0
CTL1
4
5
CMOS
I/O
Control I/Os. These bidirectional signals control communication between the TSB41AB2 and the
LLC. Bus holders are built into these terminals.
D0
D1
D2
D3
D4
D5
D6
D7
6
7
8
9
10
11
12
13
CMOS
I/O
Data I/Os. These are bidirectional data signals between the TSB41AB2 and the LLC. Bus holders
are built into these terminals.
DGND
17, 18, 63,
64
Supply
Digital circuit ground terminals. These terminals should be tied together to the low-impedance
circuit board ground plane.


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