4
Section
FUNCTIONAL SUMMARY
EMULEX FAS216 SCSI Controller
68681 DUART
72 Extensible Single Board Computer/Controller User's Manual
Table 9: EMULEX FAS216 SCSI Controller Register Map
ADDRESS
READ FUNCTION
0A000000h
Transfer Counter Low
0A000001h
Transfer Counter Mid
0A000002h
0A000003h
Command
0A000004h
Status
0A000005h
Interrupt
0A000006h
Sequence Step
0A000007h
FIFO Flags
0A000008h
Configuration 1
0A000009h
Reserved
0A00000Ah
Reserved
0A00000Bh
Configuration 2
0A00000Ch
Configuration 3
0A00000Dh
Reserved
0A00000Eh
Transfer Counter High
0A00000Fh
Reserved
Table 10: Motorola 68681 DUART Register Map
ADDRESS
READ FUNCTION
08000000h
Mode Register A
08000001h
Status Register
08000002h
DO NOT READ
08000003h
Receiver Buffer A
08000004h
Input Port Change Reg
08000005h
Interrupt Status Reg
08000006h
Counter Mode: MSB
08000007h
Counter Mode: LSB
08000008h
Mode Register B
08000009h
Status Register B
0800000Ah
DO NOT READ
0800000Bh
Receiver Buffer B
0800000Ch
Interrupt Vector Reg
0800000Dh
Input Port (unlatched)
0800000Eh
Start-Counter Command
0800000Fh
Stop-Counter Command
WRITE FUNCTION
Transfer Count Low
Transfer Count Mid
FIFO
Select/Reselect Bus ID
Select/Reselect Time-out
Synchronous Xfer Period
Synchronous Offset
Configuration 1
Clock Conversion Factor
Configuration 2
Configuration 3
Transfer Count High
Reserve FIFO Byte
WRITE FUNCTION
Mode Register A
Clock Select Register A
Command Register A
Transmitter Buffer A
Auxiliary Control Register
Interrupt Mask Register
Counter/Timer Upper
Counter/Timer Lower
Mode Register B
Clock Select Register B
Command Register B
Transmitter Buffer B
Interrupt Vector Reg
Output Port Config Reg
Output Port - Bit Set
Output Port - Bit Reset
INIT
-
-
FIFO
-
Command
-
-
-
-
-
07
05
Test mode
-
20
01
Reserved
-
-
-
INIT
13-07
BB
-
-
B0
33
-
-
13-07
BB
-
-
40
00
FF
00
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