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參數(shù)資料
| 型號： | SAA7381 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | ATAPI CD-R block decoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP144 |
| 文件頁數(shù)： | 25/108頁 |
| 文件大?。?/td> | 380K |
| 代理商： | SAA7381 |
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1997 Aug 12
25
Philips Semiconductors
Objective specification
ATAPI CD-R block decoder
SAA7381
7.3.1.2
Description of subcode interface
The subcode interface allows the reception and transmission of subcodes. The subcodes will be received/transmitted to
two on-chip 512-byte FIFOs, one for transmit and one for receive. No interrupts are associated with these FIFOs as the
block copy engine removes data or fills these as necessary.
There is, however, an interrupt which is asserted when a sync is found in an unexpected location.
7.3.2
S
UBCODE MODE TRANSMIT CONTROL REGISTER
Table 30
Subcode mode transmit control register (SUBMODETX; address FF13H); see Table 31
Table 31
Description of the SUBMODETX register bits
Note
1.
Philips V4 subcode transmit mode must be selected for correct insertion of subcode into the IEC 958 data stream.
Table 32
Subcode mode receive control register (SUBMODERX, address FF17H); see Table 33
Table 33
Description of the SUBMODERX register bits
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
pbit
txena
V4
BIT
NAME
VALUE
DESCRIPTION
4
pbit
0
1
0
1
0
1
P bit logic 1 in 3-wire mode (default)
P bit logic 0 in 3-wire mode
subcode transmit interface is disabled
subcode transmit interface is enabled
Philips SRI 3-wire subcode
Philips V4 mode; note 1
2
txena
0
V4
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
wsdiv1
wsdiv0
rxena
rckinvrx
rxsubqw
BIT
NAME
VALUE
DESCRIPTION
4
wsdiv1
00
01
10
11
0
1
0
1
0
1
no oversampling (normal CD-ROM modes)
2 times oversampling
4 times oversampling
8 times oversampling
subcode receive interface is disabled
subcode receive interface is enabled
normal RCK output
invert the RCK output
3-wire subcode
Philips V4 mode (sub Q-W)
3
wsdiv0
2
rxena
1
rckinvrx
0
rxsubqw
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