參數(shù)資料
型號(hào)： PCD5096
廠(chǎng)商： NXP Semiconductors N.V.
元件分類(lèi)： Codec
英文描述： Universal codec
中文描述： 通用編解碼器
文件頁(yè)數(shù)： 25/52頁(yè)
文件大?。?/td> 222K
代理商： PCD5096
1997 Jan 22
25
Philips Semiconductors
Preliminary specification
Universal codec
PCD5096
9.6
IOM data buffers
The address space 40H to 77H in the SDR is reserved for up to 14 IOM data buffers. These buffers are used to exchange
data between the IOM-2 interface and the on-chip DSP. Each IOM data buffer consists of four 16-bit words: two words
for storing inbound data and two words for outbound data; this is shown in Fig.9
9.7
Local loop
A local call is implemented in order to loop-back data from one codec to another codec and vice-versa, as illustrated in
Fig.10. The inbound and outbound buffer are simply swapped. This is done by setting bit 8 in the correct IOM control
table word (see Section 9.5).
A local call is created by assigning one IOM data buffer to 2 codecs, whereby in one IOM control word bit 8 is set, and
in the other IOM control word bit 8 is reset.
Fig.9 Data flow between the IOM-2 interface and the DSP.
(1) IOM data buffers location is SDR: n = S
×
4 with S = B4 to B0 of the corresponding word in the IOM control table.
handbook, full pagewidth
MBH868
INBOUND
SDR
(1)
n
+
4
n
+
2
n
OUTBOUND
DI
DO
IOM interface
DSP
Fig.10 Local call switching on the IOM interface.
(1) Bit 8 is set in slot 0 control word.
(2) Bit 8 is reset in slot n control word.
handbook, full pagewidth
MBH869
odd frame
even frame
even frame
slot 0
(1)
slot n
(2)
0
0
n
n
0
0
0
0
0
DI
DO
n
n
0
n
n
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