OXCF950_06 Datasheet, PDF(20/66 Page) Oxford Semiconductor – low cost asynchronous 16-bit PC card or Compact Flash UART device

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OXCF950_06 Datasheet, PDF (20/66 Pages) Oxford Semiconductor – low cost asynchronous 16-bit PC card or Compact Flash UART device

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OXFORD SEMICONDUCTOR, INC.

OXCF950 rev B DATA SHEET

5.5 CF/PCMCIA Function Configuration Registers

Each PCMCIA/CF cardâs I/O function must implement Function Configuration Registers (FCR). These registers allow the host to

configure the function provided by the card, and are mapped into the attribute memory space at the location specified within the

CONFIG tuple (in the CIS). The CONFIG tuple defines a base address for the Function Configuration Registers and a number

corresponding to how may registers are supported (4 registers in the OXCF950). Each of these registers has read/write

capability and is mapped at even location, consistent with the design of attribute memory. The registers supported in the

OXCF950 are shown in the following table.

Offset from

FCR base

address

Attribute

memory address

Configuration Options Register

Configuration and Status Register

Pin Replacement Register

Socket & Copy Register

Table 16: Configuration Register Mapping

Due to the type of function the OXCF950 configures the card to be, and the fact that it is a single function device, only a sub-set

of the total number of configuration registers are required.

The definition of each configuration register is detailed in the next few sub-sections.

5.5.1 Configuration Options Register âCORâ (offset 0xF8)

The configuration options register is used to configure PCMCIA/CF cards that have programmable address decoders. Once the

cardâs client driver has successfully parsed the CIS, it will attempt to obtain system resources, as requested by the CIS. On

completion of this it assigns the resources to the card via the COR. The COR format and description is given in Table 17.

SRESET

LevIREQ

Function Configuration Index

Field

Type

SRESET

R/W

LevIREQ1

R/W

Function Configuration Index R/W

Description

Software reset

Setting this field to â1â places the card in the reset state. This is equivalent to

setting the RESET signal (on pin) except this SRESET field is not reset.

Returning this field to â0â leaves the card in the same un-configured, reset state

as the card would be following a power-up and hard reset.

Level Mode IREQ#

Setting this field to â1â enables level type interrupts

Setting this field to â0â enables pulse type interrupts

Configuration Index

The host sets this field to the value of the Configuration Entry Number field of a

Configuration Table Entry tuple as defined in the CIS. On setting the non-zero

value in this field the function IO is enabled and IO accesses are allowed. When

the field is set to zero (e.g. after a hard reset) the card will be configured to

memory only mode and all IO accesses will be ignored by the card.

Table 17: Configuration Option Register

Note 1

The default tuples in the CIS tell the host that only level type interrupts are supported to allow lowest power consumption. The

OXCF950 supports both level and pulse type interrupts, and if a particular manufacturer requires to use pulse type, or both, then

the CIS can be modified using the external EEPROM.

DS-0027 Feb 06

ExternalâFree Release

Page 20 of 66

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