OXCB950 datasheet(15/68 Pages) ETC

15 / 68 page

Data Sheet Revision 1.1

Page 15

OXCB950

OXFORD SEMICONDUCTOR LTD.

6.3

Accessing the UART function

Access to the internal UART is achieved via standard I/O and memory mapping, at addresses defined by the Base Address

Registers (BARs) in the PCI configuration space. These BARs are configured by the system to allocate blocks of I/O and

memory space to this logical function, according to the size required by the function. The base addresses that have been

allocated can then be used to access this uart function. The mapping of these BARs is shown in the table below.

BAR

UART Function

Internal UART (I/O Mapped)

Internal UART(Memory Mapped)

Local configuration registers (I/O Mapped)

Local configuration registers (Memory Mapped)

Cardbus Status Registers (Memory Mapped)

– relevant to cardbus mode only

Unused

Table 4: Base Address Register definition

6.3.1

Cardbus/PCI access to the internal UART

IO and memory space

BAR 0 and BAR 1 of function 0 are used to access the internal UART. The function reserves an 8-byte block of I/O space and a

4K byte block of memory space. Once the I/O and/or the Memory access enable bits in the Command register (of the PCI

configuration space) are set, the UART can be accessed following the mapping shown in Table 5.

UART

Address

Cardbus/PCI Offset from Base Address 0

for Function0 in IO space (hex)

(hex)

UART

Address

Cardbus/PCI Offset from Base Address 1

for Function0 in Memory space (hex)

000

001

002

003

004

005

006

007

Table 5: Cardbus/PCI address map for the internal UART (I/O and memory)

Note 1:

Since 4K of memory space is reserved and the full bus address is not used for decoding, there are a number of aliases of the UART in the allocated

memory region

OXCB950 Datasheet(PDF) 15 Page - List of Unclassifed Manufacturers

OXCB950 Datasheet(HTML) 15 Page - List of Unclassifed Manufacturers

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

Datasheet Download

Link URL