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參數(shù)資料
| 型號： | PSB7280 |
| 廠商： | SIEMENS A G |
| 元件分類： | 消費家電 |
| 英文描述： | Joint Audio Decoder-Encoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 文件頁數(shù)： | 57/190頁 |
| 文件大?。?/td> | 2177K |
| 代理商： | PSB7280 |
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PSB 7280
Semiconductor Group
57
Data Sheet 1998-07-01
HXW1/2 register can be overwritten by the DSP or host before the next 1, 2 or 4 bytes
(programmable) have been shifted out of the shift register.
After reset (XRES), the reset status data of HXR1/2 and HXW1/2 is ignored by the
transmitter, i.e. the contents of HXR1/2 and HXW1/2 are not transmitted to the line, but
only the data from the HDLC transmitter. In the first cycle after the transmitter has been
activated (XAC = 1), the data from the HDLC transmitter is immediately passed to the
HXR1/2 register for post-processing. The line-transmission is not yet started! In the first
cycle after the DSP or host (programmable via HHX1/2) has written the HXW1/2 register
with the post-processed value, this value is passed through the bit-reversal unit into the
shift register and the transmission is started as soon as the next beginning of the
selected time-slot is detected.
The start of the transmission can be in the same frame (w.r.t. the frame sync signal on
the chosen line) as the setting of XAC = 1 and/or the writing to the HXW1/2 register since
the time-slot logic works independently of XAC.
In transparent mode (TMO = 1) the transmission is only started at the beginning of the
time-slot (time-slot aligned). If the first write to HXW1/2 happens during the selected
time-slot, the transmitter waits for the beginning of the time-slot in the next frame.
Transmitter in LMOD(1:0) = 00
The same applies for LMOD = 00, except the post-processing is not available. The data
from the HDLC transmitter is after XAC = 1 directly passed through the bit-reversal unit
into the shift register. In addition, the loading of HXR1/2, HXW1/2 and the generation of
the interrupt is done like in the other LMODs for observation of the data stream by the
DSP or host only. Thus, the LMOD=00 is identical with LMOD = 01, except
post-processing is not available and the transmitter latency after reset is shortened, see
section below. The transmission is in this case started by the setting of XAC = 1. No write
to HXW1/2 is necessary.
The start of the transmission can be in the same frame (w.r.t. the frame sync signal on
the chosen line) as the setting of XAC = 1 since the time-slot logic works independently
of XAC.
In transparent mode (TMO = 1) the transmission is only started at the beginning of the
time-slot (time-slot aligned). If XAC is set to ‘1’ during the selected time-slot, the
transmitter waits for the beginning of the time-slot in the next frame.
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相關代理商/技術參數(shù) |
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| PSB7280FV3.1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| PSB7300AGDW | 制造商:Infineon Technologies AG 功能描述: |
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| PSB7501 ZDW | 制造商:Lantiq 功能描述: |
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