XR17L154 Datasheet, PDF (8/56 Pages) Exar Corporation – 3.3V PCI BUS QUAD UART

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XR17L154
3.3V PCI BUS QUAD UART
REV. 1.1.0
ADDRESS BITS
0x00
0x04
31:16
15:0
31:28
27
26:25
24
23
22:16
15:9,7,
5,4,3,2
8
6
1
0
0x08
0x0C
0x10
0x14
0x18h
0x1C
0x20
0x24
0x28
0x2C
31:8
7:0
31:24
23:16
15:8
7:0
31:11
10:0
31:0
31:0
31:0
31:0
31:0
31:0
31:16
TABLE 1: PCI LOCAL BUS CONFIGURATION SPACE REGISTERS
TYPE
DESCRIPTION
RWR^{1 Device ID (Exar device ID number or from EEPROM)}
RWR^{1 Vendor ID (Exar ID or from EEPROM) specified by PCISIG}
RO Status bits (error reporting bits)
R-Reset Target Abort. Set whenever L154 terminates with a target abort.
RO DEVSEL# timing.
RO Unimplemented bus master error reporting bit
RO Fast back to back transactions are supported
RO Reserved Status bits
RO Command bits (reserved)
WO
WO
RWR
RO
RO
RO
RO
RO
RO
RO
RW
RO
RO
RO
RO
RO
RO
RO
RWR¹
SERR# driver enable. Logic 1=enable driver and 0=disable driver
Parity error enable. Logic 1=respond to parity error and 0=ignore
Command controls a device’s response to mem space accesses:
0=disable mem space accesses, 1=enable mem space accesses
Command controls a device’s response to I/O space accesses:
0 = disable I/O space accesses 1 = enable I/O space accesses
Class Code (Simple 550 Communication Controller).
Revision ID (Exar device revision number)
BIST (Built-in Self Test)
Header Type (a single function device with one BAR)
Unimplemented Latency Timer (needed only for bus master)
Unimplemented Cache Line Size
Memory Base Address Register (BAR)
Claims a 2K address space for the memory mapped UARTs
Unimplemented Base Address Register (returns zeros)
Unimplemented Base Address Register (returns zeros)
Unimplemented Base Address Register (returns zeros)
Unimplemented Base Address Register (returns zeros)
Unimplemented Base Address Register (returns zeros)
Reserved
Subsystem ID (write from external EEPROM by customer)
RESET VALUE
(HEX)
0x0154
0x13A8
0000
0
00
0
1
000 0000
0x0000
0
0
0
0
0x070002
0x01
0x00
0x00
0x00
0x00
0x00
0xX000
0x00000000
0x00000000
0x00000000
0x00000000
0x00000000
0x00000000
0x0000
8