fw802a ETC-unknow, fw802a Datasheet - Page 9

• Manufacturer Part Number: fw802a
• Description: Low-power Ieee 1394a-2000 Two-cable Transceiver/arbiter Device
• Manufacturer: ETC-unknow

June 2001
Signal Information
Table 1. Signal Descriptions (continued)
* Active-low signals are indicated by “/” at the beginning of signal names, within this document.
Agere Systems Inc.
26, 27, 62
43, 50, 51
25, 56, 64
30, 31,
32, 49,
52, 53
7, 17,
2, 14,
Pin
35
40
34
39
33
38
37
42
59
60
TPBIAS0
TPBIAS1
Signal*
TPB0+
TPB1+
TPA0−
TPA1−
TPB0−
TPB1−
V
V
V
V
XO
DDA
SSA
XI
DD
SS
(continued)
Analog I/O Portn, Port Cable Pair A. TPAn is the port A connection to the twisted-
Analog I/O Portn, Port Cable Pair B. TPBn is the port B connection to the twisted-
Analog I/O Portn, Port Cable Pair B. TPBn is the port B connection to the twisted-
Analog I/O Portn, Twisted-Pair Bias. TPBIAS provides the 1.86 V nominal bias
Type
—
—
—
—
—
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.
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.
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.
voltage needed for proper operation of the twisted-pair cable drivers and
receivers and for sending a valid cable connection signal to the remote
nodes.
Digital Power. V
Analog Circuit Power. V
device.
Digital Ground. All V
ground plane.
Analog Circuit Ground. All V
impedance ground plane.
Crystal Oscillator. XI and XO connect to a 24.576 MHz parallel resonant
fundamental mode crystal. Although, when a 24.576 MHz clock source is
used, it can be connected to XI with XO left unconnected. The optimum
values for the external shunt capacitors are dependent on the specifica-
tions of the crystal used. It is suggested that two 12 pF shunt capacitors
be used for a crystal with a specified 7 pF loading capacitance. For more
details, see Crystal Selection Considerations in the Application Informa-
tion section.
DD
supplies power to the digital portion of the device.
SS
signals should be tied to the low-impedance
DDA
Two-Cable Transceiver/Arbiter Device
Name/Description
supplies power to the analog portion of the
SSA
signals should be tied together to a low-
9