參數(shù)資料
型號(hào)： SAA7381
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： ATAPI CD-R block decoder
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP144
文件頁數(shù)： 30/108頁
文件大?。?/td> 380K
代理商： SAA7381
1997 Aug 12
30
Philips Semiconductors
Objective specification
ATAPI CD-R block decoder
SAA7381
Table 41
Description of the MCK_CON register bits (note 1)
Note
1.
The bits in this register control the use of the MCK pin as an output to clock a CD-DSP. The division ratios chosen
are suitable for the SAA7335 or CDR60 devices. If the MCK pin is not being used then it should be pulled HIGH for
correct selection of the internal multimedia clocks.
BIT
NAME
VALUE
DESCRIPTION
3
mckxtal
0
1
0
1
MCK reference is system clock (default)
MCK reference is the CRIN pin
MCK pin is 3-state, an input to the MM block (default)
MCK pin is output
MCK reference is divided by 2 (default)
MCK reference is divided by 1.5
MCK reference is divided by 1
MCK reference is divided by 4
2
mckoe
1 and 0
div
00
01
10
11
7.3.5
M
EMORY
-
TO
-
MEMORY BLOCK COPY FUNCTION
This function is provided for the user to move and copy
blocks of RAM. Two pointer sets are provided. The second
of these is for the semi-automatic subcode copying
function of the subcode in the block. It is independent of
the first copy register set, which is available for e.g. audio
copying needed in the PLAY AUDIO function with the
SAA7381, and for subcode copying when recording.
When started, the copy process will copy the
COPYCOUNT register bytes from the ‘FROM’ pointers to
the ‘TO’ pointers. A copying process may be stopped
during its operation by writing to the ‘copyend’ bit.
7.3.5.1
Automatic copying of received
subcode-to-data block
When enabled, the newly received subcode will be
automatically transferred to the current host segment in
RAM.
The only register that is user programmable in the subcode
copying engine is the COPYFROM2OFFSET pointer.
The ‘COPYFROM2OFFSET’ pointer is set up by the
sub-CPU to point into the subcode input FIFO. It points at
the first byte of subcode to be copied into the current host
data block. Once triggered, this copy is automatically
set-up to correctly transfer the next block of subcode
correctly without host intervention.
Copying of the subcode in the opposite direction is
performed by the sub-CPU commanding an interleaved
copy of data using the user block copy registers. This does
not have to be as fast for subcode output to the user
channel of the IEC 958 output as this is only specified to
n = 1 rate.
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