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| 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)： | 16/25頁(yè) |
| 文件大小： | 220K |
| 代理商： | 20575 |
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when the MAC CRC state machine should begin calcu-
lation.
TCR9[7:0] Start Delimiter CSB
TCR9[7:0] should be set to A0 for IEEE 802.11 protocol
operation.
TCR9[7:0] is used to match the second arriving byte of
the Start of Frame Delimiter (Unique Word) in incoming
and outgoing frames. This information is used to deter-
mine when the MAC CRC state machine should begin
calculation.
TCR10[7:0] Start Delimiter MSB
TCR10[7:0] should be set to F3 for IEEE 802.11 protocol
operation.
TCR10[7:0] is used to match the first arriving byte of the
Start of Frame Delimiter (Unique Word) in incoming and
outgoing frames. This information is used to determine
when the MAC CRC state machine should begin calcu-
lation.
TCR13[7:0] Pin Configuration A
TCR13[7:0] should be set to FFh.
The TCR13[7:0] bits are used to determine if the I/O
structure at the pin location specified for each bit loca-
tion is to be enabled to drive output values. For the HAR-
RIS PRISM PC CARD application, each of the following
pins will either be used as an output from the Am79C930
device, or as an NC in the design. Therefore, the I/O
structure associated with the pin needs to be enabled
to drive as an output: LNK, LFPE, HFPE, SDCLK,
SDSEL3, SDSEL2, SDSEL1, and RXPE.
TCR14[7:0] Pin Configuration B
TCR14[7:0] should be set to D8h.
The TCR14[7:0] bits are used to determine if the I/O
structure at the pin location specified for each bit loca-
tion is to be enabled to drive output values. For the HAR-
RIS PRISM PC CARD application, USER7, LLOCKE,
USER4, and USER3 will all be outputs from the
Am79C930 device, or will be NC in the design, hence,
TCR14[7:6] and TCR14[4;3] are set to 1. Note that
TCR14[5] is a reserved location and, therefore, must be
reset to a 0.
TCR15[7:0] ANTSLTLEN
TCR15[7:0] should be set to 82h.
The TCR15[7:1] bits are used to determine if the I/O
structure at the pin location specified for each bit
location is to be enabled to drive output values. For the
HARRIS PRISM PC CARD application, ANTSLT and
ACT are outputs or NC in the design, while TXDATA,
TXCMD, RXC, USER6, and USER5 are inputs.
The TCR15[0] bit is used to determine the functionality
of the STSCHG pin. For the HARRIS PRISM PC CARD
application, this pin is not to be used for STSTCHG
functionality; hence, the TCR15[0] bit should be set to 0.
TCR27[7:0] TIP LED Scramble
TCR27[7:0] should be set to 83h.
TCR27 controls several functions.
TCR27[7] controls the RUNERR function. The
RUNERR function is not used for the HARRIS PRISM
PC CARD application. Therefore, TCR27[7] must be set
to a 1 in order to disable the function.
TCR27[6] is reserved and must be reset to 0.
TCR27[5] controls the use of the input signal at the
USER5 input pin for the EXTCS function. For the HAR-
RIS PRISM PC CARD application, the USER5 input
signal is not used for the EXTCS function. Therefore,
TCR27[5] must be reset to 0.
TCR27[4] controls the drive type on the LNK pin. For
the HARRIS PRISM PC CARD application, the LNK pin
drive should be open drain. Therefore, TCR27[4] must
be reset to a 0.
TCR27[3] controls the drive type on the ACT pin. For
the HARRIS PRISM PC CARD application, the ACT pin
drive should be open drain.Therefore, TCR27[3] must
be reset to a 0.
TCR27[2] controls the polarity of the FDET pin. For the
HARRIS PRISM PC CARD application, the FDET pin
is not used, Therefore, TCR27[2] must be reset to a 0.
TCR27[1] controls the polarity of the TXPE pin. For the
HARRIS PRISM PC CARD application, the TXPE pin is
not used. Therefore, TCR27[1] must be reset to a 1.
TCR27[0] controls the polarity of the TXMOD pin. For
the HARRIS PRISM PC CARD application, the TXMOD
pin polarity should be high assert. Therefore, TCR27[0]
must be reset to a 1.
TCR28[7:0] CCA Configuration
TCR28[7:0] should be set to 20h.
TCR28[7:0] controls several functions.
TCR28[7] controls the RXC pin function. The RXC func-
tion of this pin is not used for the HARRIS PRISM PC
CARD application. Therefore, TCR28[7] must be reset
to a 0 in order to disable the function.
TCR28[6] controls the EXTSDF pin function. The
Am79C930 device will perform the Start Delimiter
Detection (Unique Word Detection) for incoming receive
frames and, therefore, TCR28[6] must be set to a 0 in
order to disable the external input function.
TCR28[5] controls the EXTCHBSY pin function. The
HARRIS HSP3824 chip will perform the Clear Channel
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