參數(shù)資料
型號(hào)： 20575
英文描述： Wireless LAN DSSS PC Card Reference Design Application ? 220KB (PDF)
中文描述： 無(wú)線局域網(wǎng)擴(kuò)頻PC卡參考設(shè)計(jì)中的應(yīng)用？欺詐郵件（PDF格式）
文件頁(yè)數(shù)： 17/25頁(yè)
文件大?。?/td> 220K
代理商： 20575
16
Assessment function in this application and, therefore,
TCR28[5] must be set to a 1 in order to enable the func-
tion. (Note that ENXCHBSY (TCR28[5]) must also be
set to a 1 in order for the EXTSDF input to be fully func-
tional.)
TCR28[4] controls the Am79C930 device’s use of its
internal antenna diversity decision to control the transi-
tion
of
the
receive
RCVR_ENABLED to SFD_SEARCH. For the HARRIS
PRISM PC CARD application, the Antenna Diversity
function will be performed by the HARRIS HSP3824
device. Therefore, TCR28[4] must be set to a 0 in order
to allow the RCVR_ENABLED to SFD_SEARCH state
transition to occur unconditionally.
state
machine
from
TCR28[3] controls the Am79C930 device’s use of its
internal CCA logic decision to control its internal anten-
na diversity decision. Since neither of these functions
is used in the HARRIS PRISM PC CARD application,
TCR28[3] must be set to a 0.
TCR28[2] controls the Am79C930 device’s use of its in-
ternal baud detect logic output to control its internal an-
tenna diversity decision. Since the Am79C930 device’s
antenna diversity logic is not used in the HARRIS PRISM
PC CARD application, TCR28[2] must be set to a 0.
TCR28[1] controls the Am79C930 device’s use of its
internal baud detect logic output to control its internal
CCA decision. Since the Am79C930 device’s CCA logic
is not used in the HARRIS PRISM PC CARD applica-
tion, TCR28[1] must be set to a 0.
TCR28[0] controls the Am79C930 device’s use of its in-
ternal RSSI threshold comparison logic output to control
its internal CCA and antenna diversity decisions. Since
neither of these functions is used in the HARRIS PRISM
PC CARD application, TCR28[0] must be set to a 0.
TCR30[7] Pin Function and Data Rate
TCR30[7:0] should be set to 89h.
TCR30[7:0] controls several functions.
TCR30[7] controls the ANTSLT pin function. The
ANTSLT pin is used as an output of the Am79C930
device for the HARRIS PRISM PC CARD application.
Therefore, TCR30[7] must be set to a 1 in order to invoke
the proper pin function.
TCR30[6] controls the TXDATA pin function. The TXDA-
TA pin is not used for the HARRIS PRISM PC CARD
application. Therefore, TCR30[6] must be reset to a 0
in order to invoke the proper pin function.
TCR30[5] controls the TXCMD pin function. The TXC-
MD pin is not used for the HARRIS PRISM PC CARD
application and, therefore, TCR30[5] must be reset to a
0 in order to invoke the proper pin function.
TCR30[4] controls the USER7 pin function. The USER7
pin is not used for the HARRIS PRISM PC CARD ap-
plication and, therefore, TCR30[4] must be reset to a 0
in order to invoke the proper pin function.
TCR30[3] controls the direction of the TXC pin. The TXC
pin is an input to the Am79C930 device within the HAR-
RIS PRISM PC CARD application. Therefore, TCR30[3]
must be set to a 1 in order to invoke the proper pin
function.
TCR30[2:0] control the data rate of transmission and
reception of serial network data. The nominal data rate
will be 1 Mbps. The HARRIS PRISM PC CARD system
is capable of switching automatically to a rate of 2 Mbps
as indicated by the device driver software. The rate
switch to 2 Mbps will be performed by setting a dynamic
rate switch bit at the time of transmission for each frame,
if the device driver has indicted that the frame should
be transmitted at the higher rate. The MAC control firm-
ware will set the dynamic rate switch bit as necessary.
The setting of the Data Rate bits in this register should
conform to the nominal rate of 1 Mbps, because the rate
switching mechanism in the Am79C930 device allows
for an automatic internal modification of the Data Rate
bits such that in the middle of a frame to be transmitted
a 2 Mbps, the internal Data Rate bits will automatically
be modified at the correct time to allow the MAC portion
of the frame to be transmitted a 2 Mbps. Therefore, the
proper data rate setting for the HARRIS PRISM PC
CARD application is 1 Mbps. With the CLKIN input fre-
quency set to 40 MHz, TCR30[2:0] must be set to ZERO
ZERO ONE binary in order to invoke the proper 1 Mbps
nominal data rate.
NC Pins Configured As Output
As a general note, unused pins (NC) may have an input/
output structure inside of the Am79C930 device. There-
fore, if the unused pin is left as an NC on the PCB and
the output structure of the Am79C930 device is not driv-
ing a value, then the pin will float and the input structure
could enter a state which sinks a relatively undesirable
amount of DC current, thereby, reducing the effective-
ness of the power-down mode. In order to guarantee
the lowest possible power-down current consumption,
all Am79C930 pins that are NC in the design need to
be configured for output mode of operation
the register setting recommendations described in this
application note will achieve this objective.
. Following
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