XR17V254 Datasheet, PDF (9/70 Pages) Exar Corporation – 66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT

REV. 1.0.0
XR17V254
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
ADDRESS
OFFSET
BITS
0x00 31:16
15:0
0x04
31
30
29:28
27
26:25
24
23
22
21
20
19:16
15:9,7,
5,4,3,2
8
6
1
0
0x08
0x0C
0x10
0x14
0x18h
0x1C
0x20
31:8
7:0
31:24
23:16
15:8
7:0
31:11
10:0
31:0
31:0
31:0
31:0
TABLE 1: PCI LOCAL BUS CONFIGURATION SPACE REGISTERS
TYPE
DESCRIPTION
EWR
EWR
RWC
RWC
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Device ID (Exar device ID number)
Vendor ID (Exar) specified by PCISIG
Parity error detected. Cleared by writing a logic 1.
System error detected. Cleared by writing a logic 1.
Unused
Target Abort.
DEVSEL# timing.
Unemployments bus master error reporting bit
Fast back to back transactions are supported
Reserved Status bit
66MHz capable
Capabilities List
Reserved Status bits
Command bits (reserved)
RESET VALUE
(HEX OR BINARY)
0x0254
0x13A8
0b
0b
00b
0b
00b
0b
1b
0b
1b
1b
0000b
0x0000
RWR
RWR
RWR
RO
EWR
RO
RO
RO
RO
RO
RWR
RO
RO
RO
RO
RO
SERR# driver enable. logic 1=enable driver and 0=disable driver
0b
Parity error enable. logic 1=respond to parity error and 0=ignore
0b
Command controls a device’s response to mem space accesses:
0b
0=disable mem space accesses, 1=enable mem space accesses
Device’s response to I/O space accesses is disabled.
0b
(0 = disable I/O space accesses)
Class Code (Default is ’Simple 550 Communication Controller’)
0x070002
Revision ID (Exar device revision number)
Current Rev. value
BIST (Built-in Self Test)
0x00
Header Type (a single function device with one BAR)
0x00
Unimplemented Latency Timer (needed only for bus master)
0x00
Unimplemented Cache Line Size
0x00
Memory Base Address Register (BAR)
0x00
Claims a 2K address space for the memory mapped UARTs
0x000
Unimplemented Base Address Register (returns zeros)
0x00000000
Unimplemented Base Address Register (returns zeros)
0x00000000
Unimplemented Base Address Register (returns zeros)
0x00000000
Unimplemented Base Address Register (returns zeros)
0x00000000
9