SAA7385GP Philips Semiconductors, SAA7385GP Datasheet - Page 39

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

Philips Semiconductors
11.6
In the 53CF94 SCSI controller, some registers are read only and others are write only. These share the same address
and the multiplexing between the two depends on the read or write select.
This part contains only a brief description of the register definitions. For a more detailed definition, see the data sheet for
the SCSI device.
Table 57 Transfer count registers: 0xF0A4, F0A5 and F0BE- 53CF94 addresses: 0x00, 01, 0E; note 1
Note
1. These registers form the 24-bit transfer count value for DMA operations; they specify the number of bytes that are
Table 58 FIFO buffer register: 0xF0A6 - 53CF94 address 0x02; note 1
Note
1. The FIFO is a 16
Table 59 Command register: 0xF0A7 - 53CF94 address 0x03; note 1
Note
1. The command register is a two-deep read/write register used to pass commands to the SCSI controller; up to two
Table 60 Status register and destination ID: 0xF0AC - 53CF94 address 0x04; note 1
Note
1. This register contains the flags indicating the occurrence of certain events.
1996 Jun 19
MNEMONIC
MNEMONIC
MNEMONIC
MNEMONIC
Error correction and host interface IC for
CD-ROM (SEQUOIA)
transferred.
present in this FIFO ready to be read by the microcontroller at the end of the SCSI command phase.
commands can be stacked at the same time. When ENDMA is set, the command is a DMA instruction.
TCHIGH
TCLOW
TCMID
STAT
STAT
FIFO
CMD
53CF94 related registers
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W
R
9-bit buffer between the SCSI interface and the memory. The SCSI command packet will be
ENDMA
DATA7
DATA7
DATA7
DATA7
INT
7
7
7
7
DATA6
DATA6
DATA6
DATA6
GE
6
6
6
6
DATA5
DATA5
DATA5
DATA5
PE
5
5
5
5
39
DATA4
DATA4
DATA4
DATA4
COMMAND6 to COMMAND0
TC
4
4
4
4
DATA BYTE
DATA BYTE
DATA BYTE
DATA BYTE
DATA3
DATA3
DATA3
DATA3
VGC
3
3
3
3
DATA2
DATA2
DATA2
DATA2
MSG
ID2
2
2
2
2
Preliminary specification
DATA1
DATA1
DATA1
DATA1
C/D
ID1
1
1
1
1
SAA7385
DATA0
DATA0
DATA0
DATA0
ID0
I/O
0
0
0
0