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)： 15/25頁(yè)
文件大?。?/td> 220K
代理商： 20575
14
The HFA3524 synthesizer chip requires the following timing to appear on the serial port lines:
Figure 3.
HFA3524 Serial Port Timing Diagram
TIR26[3] ANTSEN
The ANTSEN bit of TIR26 should be set to a 1 at all
times.
The ANTSEN bit is used to determine the nature of the
signalling that will appear on the ANTSLT and ANTSLT
pins of the Am79C930 device. When ANTSEN is reset
to a 0, then the timing of the signals named above will
be determined by the ANT_SEL state machine in the
TAI portion of the Am79C930 device. The setting of
ANTSEN = ZERO should be used whenever the anten-
na selection will be performed by the Am79C930 device.
A setting of ANTSEN = ONE is used when the ANTSLT
and ANTSLT pins are to be used for any other purpose
in the system. A setting of ANTSEN = ONE disables the
Am79C930 internal antenna selection logic.
Note: In the application described herein, the HARRIS
PRISM chipset will perform the antenna selection func-
tion and, hence, a setting of ANTSEN = ONE should be
used.
When ANTSEN is set to a 1, then the timing of the sig-
nals appearing on the ANTSLT and ANTSLT pins will
be determined by firmware manipulation of the
ANTSLTD bit (TIR26[4]) and the ANTSLTLD bit
(TCR7[1]). For the application described in this applica-
tion note, antenna selection will be performed by the
HSP3824 and, hence, the Am79C930 device ANTSLT
and ANTSLT pins will be available for other use. In the
HARRIS PRISM PC CARD application, ANTSLT and
ANTSLT pins will be used to control the filter selection
in the HFA3724 device. The Am79C930 firmware will
create the appropriate signalling through register bit
manipulation that will occur as part of the RADIO API
call “initialize()”.
TCR7[7:0] User Pins Control
TCR7[7:0] should be set to 02h.
TCR7 controls several functions.
TCR7[7] controls the CTS function of the USER1 pin.
The CTS function is not used for the HARRIS PRISM
PC CARD application, and, therefore, TCR7[7] must be
reset to a 0 in order to disable the function.
TCR7[6] controls the function of the USER6 pin when
the Am79C930 device is operating in ISA PnP mode.
PC CARD mode is used for the HARRIS PRISM PC
CARD application and, therefore, TCR7[6] must be re-
set to a 0.
TCR7[5] controls the function of the USER5 pin when
the Am79C930 device is operating in ISA PnP mode.
PC CARD mode is used for the HARRIS PRISM PC
CARD application and, therefore, TCR7[5] must be re-
set to a 0.
TCR7[4:3] controls the active edge for generation of
interrupts from the USER1/INT188 input to the 80188
core. The USER1 INT188 function is not used for the
HARRIS PRISM PC CARD application and, therefore,
TCR7[4:3] must be reset to ZERO-ZERO binary.
TCR7[2] affects the output value at the TXCMD pin. The
TXCMD function is not used for the HARRIS PRISM PC
CARD application and, therefore, TCR7[2] must be re-
set to a 0.
TCR7[1] affects the output value at the ANTSLT pin. For
the HARRIS PRISM PC CARD application, the ANTSLT
output value will be controlled by the RADIO API call
“initialize().” The initial value for TCR7[1] must be a 1,
since this signal will control the characteristics of a tun-
able filter on the HARRIS PRISM PC CARD.
TCR7[0] affects the output value at the TXDATA pin. The
TXDATA function is not used for the HARRIS PRISM PC
CARD application and, therefore, TCR7[0] must be re-
set to a 0.
TCR8[7:0] Start Delimiter LSB
TCR8[7:0] can be set to any value for IEEE 802.11 pro-
tocol operation, since the start delimiter for the 802.11
DS PHY is only two bytes in length.
TCR8[7:0] is used to match the third arriving byte of the
Start of Frame Delimiter (Unique Word) in incoming and
outgoing frames. This information is used to determine
USER4 (LE)
SDCLK (SCLK)
SDDATA (SD)
don't care
20 19 18 17
3
2
C2 C1
MSB
1
相關(guān)PDF資料
PDF描述
20602 3.0 Volt-only Flash Memory Technology
206043-1 EINBAUKUPPLUNG FLANSCH 14POL GROESSE 11
206043-3 KUPPLUNG AUSSENGEWINDE 14POL GROESSE 17
206062-1 CONNECTORS CIRCULAR
206136-1 KUPPLUNGSGEHAEUSE 7POL GEHAEUSE 23
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
2057-500 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Logic IC
2057500-1 制造商:TE Connectivity / AMP 功能描述:
2057-5016-78 制造商:Omnivision Technologies Inc 功能描述:
2057-5119-02 功能描述:RF 連接器 PCB PLUG SEALED RoHS:否 制造商:Bomar Interconnect 產(chǎn)品:Connectors 射頻系列:BNC 型式:Jack (Female) 極性: 觸點(diǎn)電鍍:Gold 阻抗: 端接類型:Solder 主體類型:Straight Bulkhead 電纜類型:
2057555-1 功能描述:I/O 連接器 SFP+ ENHANCED 1X2 CA GE ASSEMBY RoHS:否 制造商:Hirose Connector 產(chǎn)品:Plugs 系列:DH 端口數(shù)量: 位置/觸點(diǎn)數(shù)量:51 節(jié)距:1 mm 觸點(diǎn)電鍍: 觸點(diǎn)材料: 型式:Male 電流額定值:0.5 A 安裝風(fēng)格:Cable 端接類型:IDC 顏色: 安裝角:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*