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參數資料
| 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： | 168/190頁 |
| 文件大小： | 2177K |
| 代理商： | PSB7280 |
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PSB 7280
Semiconductor Group
168
Data Sheet 1998-07-01
When starting the above procedure, it begins at the point marked with “Start in first
frame”. This is to enable the host to have control of the real start time, so the host first
has to deliver compressed data to the JADE and generate the corresponding interrupt.
After that, the IOM/Host handshake procedure is executed cyclically.
Note: A polling host should not directly poll the IND interrupt status register 58
H
, but the
DINT bit in INT interrupt status register 75
H
. This bit always shows whether an
interrupt from the DSP has been generated or not, independently of the
corresponding mask register. The mask register only decides whether an interrupt
at INT line is generated. After having recognized an IND interrupt status, the
polling host may read out the register 58
H
to get the interrupt number.
Note: Some special situations have to be considered if one uses a slow host that cannot
always ensure to finish the whole interrupt handshake in one frame period (default
10 ms), i.e. before the next VocoderFinished interrupt is generated by the JADE.
Collisions between not finished interrupts and the new VocoderFinished Interrupt
may occur.
Interrupt Conflicts with a Slow Host
In the following some special situations and the recommended handling are described
to keep the host protocol stable also in situations where the host has not finished it’s
interrupt requests before the begin of the next time frame, as long as the interrupt service
delay is less than 160 ms.
The following descriptions apply for all encoder/decoder modes, except the 16-kHz
pass-through. In the 16-kHz pass-through mode, the host must ensure that all interrupts
are finished before the next “VocoderFinished” is generated by the JADE. This is
because of the special double-”VocoderFinished” protocol, see text above.
If the interrupt service from the host is delayed by up to 160 msec, none of the Interrupts
during this time (usually only one "VocoderFinished" every 10 msec) is lost, but they are
delayed, too, until the host is able to service them. Thus, after a gap in interrupt service
a burst of interrupts has to be serviced by the host.
The interrupts “Write JADE Control Block” and “Read JADE Status” are representative
for all kinds of interrupts initiated by the host, so they are used in the following as an
example for the corresponding type of interrupt.
1.
“Write JADE Control Block” conflict with “VocoderFinished”, Case 1
A critical situation for the host may occur when a “Write JADE Control Block” (WCB)
interrupt handshake is done immediately before the next time frame starting with the new
"VocoderFinished" (VocFin) interrupt begins. See
Figure 50
.
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