SAA7390GP Philips Semiconductors, SAA7390GP Datasheet - Page 59

• Manufacturer Part Number: SAA7390GP
• Description: High performance Compact Disc-Recordable CD-R controller
• Manufacturer: Philips Semiconductors

Philips Semiconductors
15.6.1
The system synchronization line (SYS_SYNC) is locked on a hardware generated frame synchronization; the decoders
sub-code, the ATIP and the encoders synchronization signals. The communication synchronization line (COM_SYNC)
has the same frequency as SYS_SYNC, except for four-times speed operation, where it is down-scaled with a factor 3.
Table 80 provides a representation between the speed and synchronization lines.
Table 79 Relationship of synchronization line frequency and speed.
1996 Jul 02
handbook, full pagewidth
handbook, full pagewidth
SYS_SYNC (full period)
SYS_SYNC (half period)
COM_SYNC (half period)
High performance Compact
Disc-Recordable (CD-R) controller
R
ELATIONSHIP BETWEEN COMMUNICATION AND SYSTEM SYNCHRONIZATION
decoder interrupt
COM_SYNC
SYS_SYNC
SIGNAL
ATIP sync interrupt
decoder interrupt
encoder interrupt
Fig.24 Phase relationship of COM_SYNC and SYS_SYNC (n = 1, n = 2).
COM_SYNC
SYS_SYNC
Fig.25 Phase relationship of COM_SYNC and SYS_SYNC (n = 4).
n = 1
13.3
6.6
6.6
59
n = 2
6.6
3.3
3.3
SPEED (ms)
n = 4
1.66
3.3
5.0
MGE526
Preliminary specification
MGE527
SAA7390
n = 6
2.2
1.1
3.3