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參數(shù)資料
| 型號(hào)： | SM5907AF |
| 廠商： | Seiko NPC Corporation |
| 英文描述： | compression and non compression type shock-proof memory controller |
| 中文描述： | 壓縮和非壓縮式防震內(nèi)存控制器 |
| 文件頁數(shù)： | 23/30頁 |
| 文件大小： | 231K |
| 代理商： | SM5907AF |
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NIPPON PRECISION CIRCUITS-23
SM5906AF
Compare-connect sequence
In compare-connect mode, there are 6 connect
modes: CDDA mode 3-pair compare-connect, 2-
pair compare-connect and direct connect, plus
VCD/SVC mode ASH connect (SYNC, HEADER),
SH data connect (no C2PO check), and S connect
(SYNC) modes.
– CD-DA mode
In 3-pair compare-connect mode, the final 6 valid
data (3 pairs of left- and right-channel) and the
most recently input data are compared until three
continuous data pairs all conform. At this point, the
write sequence is re-started and data is written to
VWA.
In 2-pair compare-connect mode, comparison
occurs just as for 3-pair comparison except that
only 2 pairs from the three compared need to con-
form with the valid data. At this point, the write
sequence is re-started and data is written to VWA.
In direct-connect mode, comparison is not per-
formed at all, and write sequence starts and data is
written to the VWA. This mode is for systems that
cannot perform compare-connect operation.
– Compare-connect preparation time
1. Comparison data preparation time
Internally, when the compare-connect start com-
mand is issued, a sequence starts to restore the
data for comparison. The time required for this
preparation after receiving the command is
approximately 1
×
(1/fs). (approximately 23
μ
s
when fs = 44.1 kHz)
2. After the above preparation is finished, data is
input beginning from the left-channel data and
comparison starts.
3. The same sequence takes place in direct-con-
nect mode also. However, at the point when 3
words have been input, all data is directly con-
nected as if comparison and conformance had
taken place.
If a compare-connect stop command (80H with
MSDCN1= 1, MSDCN2= 0) is input from the micro-
controller, compare-connect sequence stops.
If compare-connect sequence was not operating,
the compare-connect stop command performs no
operation. However, make sure that the other bit
settings within the same 80H command are valid.
– VCD, SVC mode
In ASH connect mode, the final 12 bytes of sync
data in the valid data, 4 bytes of header data and
the corresponding C2PO value are compared with
new input data. If the data matches, the write
sequence starts from the next data and connect
occurs after the header data.
In SH connect mode, the compare occurs in the
same manner as in ASH connect mode except the
C2PO is not checked, even if it contains an error. If
the data matches, the write sequence starts from
the next data and connect occurs after the header
data.
In S connect mode, the new data is compared with
the sync data. If the data matches, the write
sequence starts from the next data and connect
occurs after the sync data. S connect mode can be
used when other connections are not successful.
– Compare-connect sequence stop
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