OXCFU950_07 Datasheet, PDF(23/74 Page) Oxford Semiconductor – USB/UART multi-function 16-bit PC Card device

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OXCFU950_07 Datasheet, PDF (23/74 Pages) Oxford Semiconductor – USB/UART multi-function 16-bit PC Card device

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OXFORD SEMICONDUCTOR, INC.

OXCFU950 DATA SHEET

6.7 PC Card/CompactFlash Function Configuration Registers

Each function supplied by a 16-bit PC Card or CompactFlash/CF+ card must implement function configuration registers (FCRs).

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 for that function in the CIS. The CONFIG tuple defines a base address for the

FCRs and also shows which FCRs are supported by that function. The registers supported in the OXCFU950 are shown in the

following table.

Offset from FCR

base address

0x00

0x02

0x04

0x06

0x0A

0x0C

Attribute memory

address (USB)

0x300

0x302

0x304

0x306

0x30A

0x30C

Attribute memory

address (UART)

0x200

0x202

0x204

0x206

0x20A

0x20C

Configuration options register

Configuration & status register

Pin replacement register

Socket & copy register

I/O base address register 0

I/O base address register 1

Table 5: Configuration Register Mapping

The definition of each configuration register is detailed below.

6.7.1 Configuration Options RegisterâCOR (Offset 0x00)

The configuration options register is used to configure 16-bit PC Card and CompactFlash/CF+ cards that have programmable

address decoders. When the card client driver has successfully parsed the CIS, it attempts 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 6.

SRESET

LevIREQ

Function Configuration Index

Field

Type Description

SRESET

R/W 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.

LevIREQ1

R/W Level Mode IREQ#

Setting this field to â1â enables level type interrupts

Setting this field to â0â enables pulse type interrupts

Function Configuration Index R/W 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 6: 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

OXCFU950 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 internal EEPROM.

DS-0023 February 2007

ExternalâFree Release

Page 23 of 74

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