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TSB41AB1PAP Folha de dados(PDF) 11 Page - Texas Instruments

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Nome de Peças TSB41AB1PAP
Descrição Electrónicos  IEEE 1394a-2000 ONE-PORT CABLE
Download  69 Pages
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
Logo TI - Texas Instruments

TSB41AB1PAP Folha de dados(HTML) 11 Page - Texas Instruments

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TSB41AB1
IEEE 1394a2000 ONEPORT CABLE
TRANSCEIVER/ARBITER
SLLS423I − JUNE 2000 − REVISED MARCH 2005
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
Terminal Functions
TERMINAL
NAME
NUMBER
TYPE
I/O
DESCRIPTION
NAME
PAP
PHP
GQE/ZQE
TYPE
I/O
DESCRIPTION
AGND
32, 33,
39, 48,
49, 50
26, 32,
36
A9, B9,
D9, J8
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
25, 35
B8, C8,
H7
Supply
Analog circuit power terminals. A combination of high frequency decoupling
capacitors near each terminal is 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
15
J1
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 TSB41AB1 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
N/A
B2
CMOS
O
Cable-not-active output. This terminal is asserted high when there is no
incoming bias voltage. CNA is not valid at intial power up until a device hard
reset is performed.
CPS
24
20
J5
CMOS
I
Cable power status input. This terminal is normally connected to cable power
through a 400-k
Ω 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 the application does not require it to be
used.
CTL0
CTL1
4
5
2
3
B1
C2
CMOS
I/O
Control I/Os. These bidirectional signals control communication between the
TSB41AB1 and the LLC. Bus holders are built into these terminals.


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