OXCB950 datasheet(55/68 Pages) ETC

55 / 68 page

Data Sheet Revision 1.1

Page 55

OXCB950

OXFORD SEMICONDUCTOR LTD.

8.1.6

Zone5: Function Access

Zone 5 allows the UART to be pre-configured, prior to any

cardbus/PCI accesses. This is very useful when the UART

needs to run with (typically generic) device drivers and

these drivers are not capable of utilising the enhanced

features/modes of the UART (eg 950 mode) that are

required for high performance. By using function access,

the UART registers can be accessed (setup) via the

eeprom to customize the UART features before control is

handed to the device drivers.

Each 8-bit (function) access is equivalent to accessing the

UART function through I/O BAR 0, with the exception that a

function read access does not return any data (it is

discarded). The UART function behaves as though these

function accesses via the eeprom were corresponding

cardbus/pci accesses.

Each entry for zone 5 comprises 2 16 bit words. The format

is as shown in Table 14.

1st WORD of FUNCTION ACCESS PAIR

Word

Bits

Description

‘1’ - another WORD to follow

14:12

BAR number to access

000 for BAR 0 (UART IO BAR)

Others values are reserved

‘0’ : Read access required(data will be discarded)

‘1’ : Write access required

10:8

Reserved – write 0’s

7:0

I/O address to access

This is the address that needs to be written/read and is

the offset address from the specified BAR. E.g to access

SPR register of UART, address is 00000111 (7dec).

2nd WORD of FUNCTION ACCESS PAIR

Word

Bits

Description

‘1’ – another function access WORD pair to follow.

‘0’ – no more function access word pairs. End EEPROM

program.

14:8

Reserved – write 0’s

7:0

Data to be written to specified address.

Field is unused for function access READS (set to 0’s for

reads)

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