OX16CF950 datasheet(47/60 Pages) ETC

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OXCF950 DATA SHEET V1.1

OXFORD SEMICONDUCTOR LTD.

Bits

Description

15:4

These bits should return 0xB12 to identify a valid program.

Once it reads this value from these bits it sets bit [TBD] in the

TBD register in the local register.

Reserved

1 = Zone 1 (CIS Configuration) data exists

0 = Zone 1 does not exist

1 = Zone 2 (Local Register Configuration) data exists

0 = Zone 2 does not exist

1 = Zone 3 (Function Access) data exists

0 = Zone 3 does not exist

Table 39: Zone 0 format

The programming data for each zone follows the

proceeding zone if it exists. For example a header value of

0xB127 indicates that all zones exist and they follow one

another, while 0XB123 indicates that only zone 2 and zone

3 exist.

7.3

Zone1 :Card Information Structure

This zone allows the user to provide custom tuple

information for the Card Information Structure (CIS),

overriding the default hard-coded tuple values found in the

device. Downloading into this zone programs the internal

RAM with the user’s tuple data and automatically sets the

source of the CIS to be this RAM, and not the hard coded

value.

Note: if the CIS is to be modified using the EEPROM,

tuple values presented to the host will be those

programmed into the RAM. The user must ensure that

the RAM contains all the correct tuples for the

particular application.

Tuple data bytes are interrogated until the specified

number of type 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.

The zone contains two areas to download to:

•

Attribute memory (RAM address (0 to 127)

•

Common memory (RAM address (128 to 255)

The first WORD in this zone describes how many bytes of

data are present in each zone. The next words contain the

tuple data. The first set of WORDS contain the tuples for

the common memory (if present) followed by the tuple

WORDS for the attribute memory.

Description

Byte Number

8 7

1st WORD

Number of tuple bytes in Common Memory (N)

Note : Must be a value of multiple of 2

Number of tuple bytes in Attribute Memory (M)

Note : Must be a value of multiple of 2

2nd WORD

Attribute Mem.Tuple Byte 1

Attribute Mem.Tuple Byte 0

3rd WORD

Attribute Mem.Tuple Byte 3

Attribute Mem.Tuple Byte 2

(N + 1) th WORD

Attribute Mem.Tuple Byte N-1

Attribute Mem.Tuple Byte N-2

(N + 2) th WORD

Common Mem. Tuple Byte 1

Common Mem. Tuple Byte 0

(N + 3) th WORD

Common Mem. Tuple Byte 3

Common Mem. Tuple Byte 2

(N + M + 1) th WORD Common Mem. Tuple Byte M-1

Common Mem. Tuple Byte M-2

Table 40: Word format for Zone 1

7.4

Zone 2 : Local Register Configuration

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 address 8

(allowing addresses 0 to 7 to be reserved for function access).

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