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參數(shù)資料
| 型號(hào)： | PEB3086 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ISDN SUBSCRIBER ACCESS CONTROLLER |
| 中文描述： | ISDN用戶接入控制器 |
| 文件頁(yè)數(shù)： | 147/262頁(yè) |
| 文件大小： | 3476K |
| 代理商： | PEB3086 |
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ISAC-SX
PEB 3086
Description of Functional Blocks
Data Sheet
147
2003-01-30
interrupt indications of the transmitter are not cleared by XRES, but have to be cleared
by reading these interutps.
Optionally two additional status conditions can be read by the host:
–
XDOV
(
T
ransmit
D
ata
O
verflow), indicating that the data block size has been
exceeded, i.e. more than 16 or 32 byte (D-channel) or 32 byte (B-channel) were
entered and data was overwritten.
–
XFW
(
T
ransmit
F
IFO
W
rite Enable), indicating that data can be written to the XFIFOx.
This status flag may be polled instead of or in addition to XPR.
Note: The significant interrupts and commands are underlined as only these are usually
used during a normal transmission sequence.
The XFIFO requests service from the microcontroller by setting a bit in the ISTAx
register, which causes an interrupt (XPR, XDU, XMR). The microcontroller can then read
the status register STARx (XFW, XDOV), write data in the FIFO and it can change the
transmit FIFO block size (EXMD.XFBS, for D-channel only) if required.
The instant of the initiation of a transmit pool ready (XPR) interrupt after different transmit
control commands is listed in
Table 20
.
When setting XME the transmitter appends the CRC and the endflag at the end of the
frame. When XTF & XME has been set, the XFIFOx is locked until successful
transmission of the current frame, so a consecutive XPR interrupt also indicates
successful transmission of the frame whereas after XME or XTF the XPR interrupt is
asserted as soon as there is space for one data block in the XFIFOx.
The transfer block size is 32 bytes for D- and B-channel by default, but sometimes, if the
microcontroller has a high computational load, it is useful to increase the maximum
reaction time for an XPR interrupt. However, the threshold can only be changed for D-
channel. The maximum reaction time is:
t
max
= (XFIFOx size - XFBS) / data transmission rate
With a selected block size of 16 bytes (D-channel only) an XPR interrupt indicates when
a transmit FIFO space of at least 16 bytes is available to accept further data, i.e. there
are still a maximum of 48 bytes (64 bytes - 16 bytes) to be transmitted. With a 32 bytes
Table 20
CMDRx
Register
XTF
XTF & XME
XPR Interrupt (availability of XFIFOx) after XTF, XME Commands
Transmit pool ready (XPR) interrupt initiated ...
as soon as the selected buffer size in the FIFOx is available.
after the successful transmission of the closing flag.
The transmitter always sends an abort sequence.
as soon as the selected buffer size in the FIFO is available, two
consecutive frames share flags.
XME
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| PEB3086FV1.4 TR | 制造商:Lantiq 功能描述: |
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| PEB3164FV1.1 | 功能描述:接口—CODEC CODEC & SLIC RoHS:否 制造商:Texas Instruments 類(lèi)型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類(lèi)型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
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