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FW804 датащи(PDF) 8 Page - Agere Systems

номер детали FW804
подробное описание детали  PHY IEEE 1394A Four-Cable Transceiver/Arbiter Device
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производитель  AGERE [Agere Systems]
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88
Agere Systems Inc.
Data Sheet, Rev. 3
June 2001
Four-Cable Transceiver/Arbiter Device
FW804 PHY IEEE 1394A
Signal Information (continued)
Table 1. Signal Descriptions (continued)
Pin
Signal*
Type
Name/Description
19
LPS
I
Link Power Status. LPS is connected to either the VDD supplying the
LLC or to a pulsed output that is active when the LLC is powered for the
purpose of monitoring the LLC power status. If LPS is inactive for more
than 1.2
µs and less than 25 µs, interface is reset. If LPS is inactive for
greater than 25
µs, the PHY will disable the PHY/Link interface to save
power. FW804 continues its repeater function.
1LREQ
I
Link Request. LREQ is an output from the LLC that requests the PHY to
perform some service. Bus-keeper circuitry is built into this terminal.
9, 31, 71, 72
NC
No Connect.
23
PC0
I
Power-Class Indicators. On hardware reset, these inputs set the
default value of the power class indicated during self-ID. These bits can
be programmed by tying the signals to VDD (high) or to ground (low).
24
PC1
25
PC2
18
PD
I
Powerdown. When asserted high, PD turns off all internal circuitry
except the bias-detect circuits that drive the CNA signal.
73
PLLVDD
Power for PLL Circuit. PLLVDD supplies power to the PLL circuitry
portion of the device.
74, 75
PLLVSS
Ground for PLL Circuit. PLLVSS is tied to a low-impedance ground
plane.
66
R0
I
Current Setting Resistor. An internal reference voltage is applied to a
resistor connected between R0 and R1 to set the operating current and
the cable driver output current. A low temperature-coefficient resistor
(TCR) with a value of 2.49 k
Ω ± 1% should be used to meet the IEEE
1394-1995 standard requirements for output voltage limits.
67
R1
78
/RESET
I
Reset (Active-Low). When /RESET is asserted low (active), the FW804
is reset. An internal pull-up resistor, which is connected to VDD, is
provided, so only an external delay capacitor is required to ensure that
the capacitor is discharged when PHY power is removed. This input is a
standard logic buffer and can also be driven by an open-drain logic
output buffer.
32
SE
I
Test Mode Control. SE is used during the manufacturing test and
should be tied to VSS.
33
SM
I
Test Mode Control. SM is used during the manufacturing test and
should be tied to VSS.
2
SYSCLK
O
System Clock. SYSCLK provides a 49.152 MHz clock signal, which is
synchronized with the data transfers to the LLC.
45
TPA0+
Analog I/O Portn, Port Cable Pair A. TPAn is the port A connection to the twisted-
pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept matched and as short as possible to the
external load resistors and to the cable connector.
52
TPA1+
58
TPA2+
39
TPA3+
44
TPA0
Analog I/O Portn, Port Cable Pair A. TPAn is the port A connection to the twisted-
pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept matched and as short as possible to the
external load resistors and to the cable connector.
51
TPA1
57
TPA2
38
TPA3–
* Active-low signals are indicated by “/” at the beginning of signal names, within this document.


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