OX16CF950 datasheet(48/60 Pages) ETC

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Page 48

OXCF950 DATA SHEET V1.1

OXFORD SEMICONDUCTOR LTD.

Bits

Description

‘0’ = There are no more configuariton WORDs to follow in

Zone 2. Move to next available zone or end EEPROM

program if no more zones are enabled in the header.

1’1 = There is another configuration WORD to follow for the

Local Configuration Registers

14:8

Local Register address(in IO space). Valid address range is

8 to 15

7:0

8-bit value of the register to be programmed

Table 41: Word format for Zone 2

7.5

Zone 3 : Function Access (UART)

Zone 3 allows the UART to be pre-configured, prior to any CF/PCMCIA 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 (e.g. 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 access is equivalent to accessing the UART function through IO space (addresses 0 to 7), 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 CF/PCMCIA access.

Each entry for zone 3 comprises of 2 16-bit words. The format is as shown.

1st WORD (of WORD pair)

Bits

Description

Value = 1

14:12

Reserved (write 0’s)

0 = Function read access

1 = Function write access

10:8

Reserved (write 0’s)

7:0

IO address to access (valid values 0 to 7)

Table 42: Zone 3 (first WORD) format

2nd WORD (of WORD pair)

Bits

Description

‘1’ = another function access WORD pair to follow

‘0’ = no more function access WORD pairs

14:8

Reserved (write 0’s)

7:0

Data to be written to specified addresses.

Field is unused for function access READS (set to 0)

Table 43: Zone 3 (second WORD) format

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