OXCF950 Datasheet, PDF (55/66 Pages) Oxford Semiconductor – Single full-duplex asynchronous channel 128-byte deep transmitter / receiver FIFO

OXFORD SEMICONDUCTOR LTD.
OXCF950 rev B DATA SHEET V 1.0
Bits
Description
15
‘0’ = There are no more configuration 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 44: 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.
1^st WORD (of WORD pair)
Bits
Description
15
Value = 1
14:12
Reserved (write 0’s)
11
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 45: Zone 3 (first WORD) format
2^nd WORD (of WORD pair)
Bits
Description
15
‘1’ = another function access WORD pair to follow
‘0’ = no mor e 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 46: Zone 3 (second WORD) format
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