XR17C154_05 Datasheet, PDF (12/62 Pages) Exar Corporation – 5V PCI BUS QUAD UART

XR17C154
5V PCI BUS QUAD UART
xr
REV. 1.3.2
TABLE 3: DEVICE CONFIGURATION REGISTERS SHOWN IN BYTE ALIGNMENT
ADDRESS [A7:A0]
REGISTER
READ/WRITE COMMENT
RESET STATE
Ox080
INT0 [7:0] Read-only Interrupt [3:0], Reserved [7:4]
Bits 7-0 = 0x00
Ox081
INT1 [15:8] Read-only
Bits 7-0 = 0x00
Ox082
INT2 [23:16] Read-only [3:0], Reserved [7:4]
Bits 7-0 = 0x00
Ox083
INT3 [31:24] Reserved
Bits 7-0 = 0x00
Ox084
Ox085
Ox086
Ox087
TIMERCNTL
TIMER
TIMERLSB
TIMERMSB
Read/Write Timer Control
Reserved
Read/Write Timer LSB
Read/Write Timer MSB
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Ox088
Ox089
Ox08A
Ox08B
8XMODE
REGA
RESET
SLEEP
Read/Write
Reserved
Write-only Self clear bits after executing Reset [3:0]
Read/Write Sleep mode [3:0]
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Ox08C
Ox08D
Ox08E
Ox08F
DREV
DVID
REGB
MPIOINT
Read-only Device revision
Read-only Device identification
Write-only
Read/Write MPIO interrupt mask
Bits 7-0 = 0x04
Bits 7-0 = 0x24
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Ox090
Ox091
Ox092
Ox093
MPIOLVL
MPIO3T
MPIOINV
MPIOSEL
Read/Write MPIO level control
Read/Write MPIO output control
Read/Write MPIO input polarity select
Read/Write MPIO select
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0xFF
ADDRESS
0x080-083
0x084-087
0x088-08B
0x08C-08F
0x090-093
TABLE 4: DEVICE CONFIGURATION REGISTERS SHOWN IN DWORD ALIGNMENT
REGISTER
BYTE 3 [31:24] BYTE 2 [23:16] BYTE 1 [15:8]
BYTE 0 [7:0]
INTERRUPT (read-only)
INT3
INT2
INT1
INT0
TIMER (read/write)
TIMERMSB
TIMERLSB TIMER (reserved) TIMERCNTL
ANCILLARY1 (read/write)
SLEEP
RESET
REGA (reserved) 8XMODE
ANCILLARY2 (read-only)
MPIOINT
REGB
DVID
DREV
MPIO (read/write)
MPIOSEL
MPIOINV
MPIO3T
MPIOLVL
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