OX16CF950 datasheet(9/60 Pages) ETC

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Page 9

OXCF950 DATA SHEET V1.1

OXFORD SEMICONDUCTOR LTD.

CONFIGURATION & OPERATION

PCMCIA and CF host systems allow for hot insertion of

cards.

Once a card has been inserted into a host system, the host

system will configure it. The PCMCIA standard defines two

card detect pins, that allow the host to be notified when a

card is inserted or removed.

By default the device will power up in either Normal or

Local Bus mode, depending on the mode pin. The

difference between these two modes is given in the

following table. Note that the Local Bus mode is not

suitable for CF systems.

Normal Mode (MODE=0)

Local Bus Mode (MODE=1)

Address bus is 8 bits wide.

Address bus is 4 bits wide.

Indirect access is not used.

Indirect access is used.

No external local bus.

External local bus supported.

Table 2: Differences between Normal & Local Bus Mode

The host system will wait for the READY# signal to be

active before reading the Card Information Structure, given

in attribute memory within the device. By reading this tuple

information, the host system is able to identify the device

type and the necessary resources requested by the device.

The host system will then load the device-driver software

according to this information and will configure the IO,

memory and interrupt resources. After determining that the

device is a memory and IO type device the host will enable

it’s IO mode by writing to the device’s Configuration

Options Register in attribute memory space. Device

drivers can then access the functions at the assigned

addresses.

A set of local configuration registers have been provided

that can be used to control the device’s characteristics

(such as interrupt handling) and report internal functional

status. These registers can be accessed in IO space,

utilising the same IO space as the local bus (Local Bus

mode only) and are situated above the UART registers.

These local registers can be set up by device drivers or

from the optional EEPROM.

The EEPROM can also be used to redefine the reset

values of all register areas to tailor the device to the end

users requirements if the default values do not meet the

specific requirements of the manufacturer.

This re-

programming of the device can also be performed for the

CIS area, allowing the manufacturer to mo dify resources

required, or Manufacturer ID values for example. As an

additional enhancement, the EEPROM can be used to pre-

program the UART, allowing pre-configuration, without

requiring device driver changes. This allows the enhanced

features of the integrated UART to be in place prior to

handover to any generic device drivers.

Note that a default set of tuples is provided for both

operating modes thus allowing for a single chip solution in

either mode.

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