SAA7385GP Philips Semiconductors, SAA7385GP Datasheet - Page 29

• Manufacturer Part Number: SAA7385GP
• Description: Error correction and host interface IC for CD-ROM SEQUOIA
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9.2
Table 34 53CF90 direction and audio mode control: 0xF0C1; note 1
Note
1. Register 0xF0C1 controls the audio mode byte swapping and a test mode bit.
Table 35 WTDIR field descriptions
Table 36 SCSI mode control register: 0xF0FD; note 1
Note
1. Register 0xF0FD controls the operation of the interface to the SCSI controller. The outputs of these registers are
Table 37 SCSIMOD field description
1996 Jun 19
BSB
OVER4X
TEST
BYT/PAG
RD_BUF
OFF_STR
OFF_END
OFF_ADR
MNEMONIC
MNEMONIC
Error correction and host interface IC for
CD-ROM (SEQUOIA)
SCSIMOD
AUSWP
used to directly control DRAM access cycles, and will affect any current DRAM cycle in progress.
FIELD
FIELD
Miscellaneous control registers
Byte swap bit. Defaults to swapping the most significant byte and least significant byte in the audio
mode such that the least significant byte of all audio samples is stored at even addresses in the
DRAM. Setting this HIGH causes the audio data to be stored in the same way as in the data mode.
4 over-sampling bit selection; default LOW select transmit, or no over-sampling, mode for the
sub-code and C-flag UARTs. Setting this bit HIGH will cause the sub-code and C-flag data to be
sampled at one quarter the data rate allowing Q-channel information to be correctly stored in the
registers while the CD-60 is outputting audio data at 4
Enables internal signals to be multiplexed out when the TEST pin (pin 125) is HIGH.
LOGIC
R/W
R/W
R/W
R/W
1
0
1
0
1
0
1
0
1
0
SCSI DRAM byte mode access
SCSI DRAM page mode access
SCSI read/write control; read from buffer memory
SCSI read/write control; write to buffer memory
SCSI offset start A/B control; select A registers
SCSI offset start A/B control; select B registers
SCSI offset end A/B control; select A registers
SCSI offset end A/B control; select B registers
SCSI transfers use only A registers
SCSI transfers use A and B registers
TEST
7
7
6
6
5
5
OFF_ADR OFF_END OFF_STR
29
DESCRIPTION
4
DESCRIPTION
DATA BYTE
DATA BYTE
4
over-sampling.
OVER4X
3
3
2
BSB
2
Preliminary specification
RD_BUF
1
1
SAA7385
BYT/PAG
0
0