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ISDN and 16-bit Audio
8-11
DBRI Overview
8.2.6
DBRI Commands
Control of the DBRI is mainly accomplished using commands. Table 8-2
lists the DBRI command set.
Command execution is started when a pointer to the first command is
written into REG8. Each command is at least one word in length. The first
word contains the command opcode and control bits and the second (if
needed) contains a pointer to the next command. Bits 31:28 within the first
command word contain the opcode. If bit 27 (labeled I) is set, a CMDI
interrupt is issued with the corresponding opcode in the interrupt field.
Table 10-8 illustrates the format of each command.
The more commonly used instructions are as follows:
•
IIQ – Initialize interrupt queue
•
SDP – Setup data pipe. Initialize a data pipe to carry time slots.
•
DTS – Define time slot. Specify a time slot by its start bit and length.
Opcode
Command
Function
0x0
WAIT
Wait command
0x1
PAUSE
Pause command
0x2
JMP
Jump to new command queue
0x3
IIQ
Initialize interrupt queue
0x4
REX
Report execution of command via interrupt
0x5
SDP
Setup data pipe
0x6
CDP
Continue data pipe
0x7
DTS
Define
0x8
SSP
Set short data pipe
0x9
CHI
Set CHI global mode
0xA
NT
NT command
0xB
TE
TE command
0xC
CDEC
Codec setup command
0xD
Test
Test command
0xE
CDM
CHI data mode command
0xF
Reserved
Table 8-2 DBRI Command Set
S3GX_TRMBook Page 11 Friday, September 19, 1997 11:39 am
Summary of Contents for SPARCbook 3 series
Page 8: ...viii S3GX_TRMBook Page viii Friday September 19 1997 11 39 am...
Page 44: ...2 16 The SPARC CPU SBus Controller S3GX_TRMBook Page 16 Friday September 19 1997 11 39 am...
Page 76: ...5 8 SCSI Controller DMA Support S3GX_TRMBook Page 8 Friday September 19 1997 11 39 am...
Page 146: ...9 28 MODEM Class 2 Fax Command Set S3GX_TRMBook Page 28 Friday September 19 1997 11 39 am...
Page 180: ...11 30 Display Interface RAMDAC S3GX_TRMBook Page 30 Friday September 19 1997 11 39 am...
Page 216: ...Index vi S3GX_TRMBook Page vi Friday September 19 1997 11 39 am...