參數(shù)資料
型號(hào)： TP3420AV
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 數(shù)字傳輸電路
英文描述： ISDN S/T Interface Device
中文描述： DATACOM, DIGITAL SLIC, PQCC20
封裝： PLASTIC, LCC-20
文件頁(yè)數(shù)： 29/32頁(yè)
文件大?。?/td> 524K
代理商： TP3420AV
is checked to see if it contains new data; if yes the data is
sent out from the MFT1H FIFO, if not, then the data from the
MFT1L register is sent.
If both the buffers are full, then a third load to the MFT1H
register will cause the first buffer to be overwritten by the
second and the second buffer to be loaded with the third
load. This way if a DTSE and FECV are already loaded, and
the power on the NT1 starts to fail, the software can still write
a LP command in the MFT1H register as well as the MFT1L
register. This ensures that the commands will be sent out at
the earliest moment and will continue until the power is com-
pletely lost.
Whenever a MFT1H command is written, a software flag
FL__EXT (extend SC1L) should be set. This flag informs the
software that 1 occurrence of the present 6x repetition of the
SC1L messages was overwritten by a message from SC1H,
and hence it is necessary to extend the MFT1L command for
another 30 ms to guarantee 6x tranmission. This flag is reset
after the next 30 ms tick.
SC1 Messaging Sequence
Example
Assume Software flags and buffers are defined as:
SC1L__PB - software variable, indicating previous data sent
via the SC1L channel
SC1L__NB - software variable, indicating the next value to
be sent via the SC1L channel
FL__EXT - Flag to Extend SC1L command for another 30
ms.
MFT1L, MFT1H and MFT2, are the device registers.
The sequences of events shown below indicate activity on
the SC1 channel on the line and the actions required by the
local microcontroller at each 30 ms (MFC status interrupt)
ticks.
Time
(ms)
SC1
Actions Required
I430 Frame Content
(IDLE)
0 (MFC INT)
if FL__EXT flag not set, check for new flags on SC1L, assume LRS.
Check for SC2 channel. Send SC2 command
>
MFT2.
SC1__NB(IDLE)
>
SC1__PD, SC1 command(LRS)
>
SC1__NB,
SC1__NB(LRS)
>
MFT1L.
5
(IDLE)
(IDLE)
(IDLE)
(IDLE)
(IDLE)
(LRS)
10
15
20
25
0 (MFC INT)
if FL__EXT flag not set, check for new flags on SC1L, assume IDLE.
Check for SC2 channel Flags. Send SC2 command as appropriate.
SC1__NB(LRS)
>
SC1__PB, SC1L command(IDLE)
>
SC1__NB,
SC1__NB
>
MFT1L(IDLE).
5
10
(LRS)
(LRS)
Assume DTSE-IN Interrupt from UID, Send DTSE
>
MFT1H register.
Set the FL__EXT. SC1L__PB
>
MFT1L (LRS).
15
20
(DTSE)
(LRS)
RMFE in Interrupt from local SID, FECV
>
MFT1H,
SC1L__PB
>
MFT1L(LRS). Set FL-EXT.
25
0 (MFC INT)
(FECV)
(LRS)
if FL__EXT flag set, do not check for new flags on SC1L, but check for
SC2 channel. Reset FL__EXT. Send SC2 command as appropriate,
SC1L__NB (IDLE)
>
MFT1L.
5
10
(LRS)
(LRS)
DTSE-IN Interrupt from UID, DTSE
>
MFT1H register. Set
FL__EXT, SC1L__PB
>
MFT1L register.
Also RMFE in Interrupt from local SID, FECV
>
MFT1H register. Set
FL__EXT. SC1L__PB
>
MFT1L register.
Now the FECV command is queued in the MFT1H register.
15
20
25
(DTSE)
(FECV)
(LRS)
www.national.com
29
相關(guān)PDF資料
PDF描述
TP3464 MICROWIRE⑩ Interface Device (MID)
TP3464N MICROWIRE⑩ Interface Device (MID)
TP3465N MICROWIRE⑩ Interface Device (MID)
TP3465V MICROWIRE⑩ Interface Device (MID)
TP3465 TP3465 MICROWIRETM Interface Device (MID)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TP3420AV308 功能描述:射頻收發(fā)器 RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray
TP3420AV308/63 功能描述:射頻收發(fā)器 RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray
TP3420AV308/63SN 功能描述:射頻收發(fā)器 RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray
TP3420AV308/NOPB 功能描述:射頻收發(fā)器 RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray
TP3420AV308-TR/NOPB 功能描述:IC INTERFACE ISDN DEVICE 20-PLCC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR)
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

*
*
*