OXCB950 datasheet(53/68 Pages) ETC

53 / 68 page

Data Sheet Revision 1.1

Page 53

OXCB950

OXFORD SEMICONDUCTOR LTD.

8.1.3

Zone2: Local Configuration Register Zone

The Zone2 region of EEPROM contains the program value

of the vendor-specific Local Configuration Registers using

one or more configuration WORDs. Registers are selected

using a 7-bit byte-offset field. This offset value is the offset

from Base Address Registers in I/O or memory space (see

section 6.4).

Note: Not all of the registers in the Local Configuration Register set are

writable by EEPROM. The format of configuration WORDsfor

the Local Configuration Registers in Zone1 are described in

Table 25.

Bits Description

‘0’ = There are no more Configuration WORDs

to follow in Zone2. Move to the next available

zone or end EEPROM program if no more zones

are enabled in the Header.

‘1’ = There is another Configuration WORD to

follow for the Local Configuration Registers.

14:8 These seven bits define the byte-offset of the

Local configuration register to be programmed.

For example the byte-offset for LCC[23:16] is

0x02.

7:0

8-bit value of the register to be programmed

Table 25: Zone 2 data format

8.1.4

Zone 3 : Cardbus Information Structure

This zone allows the user to provide custom tuple

information for the Cardbus Information Structure, overriding

the default hardcoded tuple values found in the device.

Downloading into this zone programs an internal RAM with

the user’s tuple data and automatically sets the source of

the cardbus information structure to be this RAM. This

process sets the local configuration register bit LCC(21) to

The format of the EEPROM organisation for this zone is

shown by the table. The first word indicates the number of

tuple data bytes to follow (in multiples of 2 NOTE1) and the

subsequent words contain the actual tuple data-bytes to be

inserted into the cardbus information structure that will be

visible at Dword18 or 32 in the PCI configuration space.

Tuple data bytes are interrogated until the specified number

of tuple data-bytes have been collected in which case the

EEPROM moves over to the next zone if it exists, or the

eeprom download terminates if no other zones are present.

Description

1st WORD

NO of TUPLE bytes to follow, in binary.

This sets a counter that will terminate download into this

zone when the correct number of Tuple Bytes have been

collected. (Value to be in multiples of 2 NOTE1)

2nd WORD

Tuple Byte 1

Tuple Byte 0

3th WORD

Tuple Byte 3

Tuple Byte 2

nth WORD

Tuple Byte y+1

Tuple Byte y

NOTE1

If the number of tuple bytes to be programmed into RAM is an odd number, it will be necessary to add a NULL tuple to make the total

number of tuple bytes to be a multiple of 2.

The data in the cardbus information structure is organised according to the order in which the tuple data has been collected. This

is as shown

CIS :

Tuple Byte3, Tuple Byte 2, Tuple Byte 1, Tuple Byte 0

Tuple Byte7, Tuple Byte 6, Tuple Byte 5, Tuple Byte 4

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