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SPI Packets

Decoder-to-Host Packet Descriptions

NUMERIC VECTOR PACKET

Table B-28 Numeric Vector Packet Bit Assignments

Byte

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

0

WN6

WN5

WN4

WN3

WN2

WN1

WN0

 

 

 

 

 

 

 

 

 

2

e

p1

p0

x

x

V2

V1

V0

 

 

 

 

 

 

 

 

 

1

x

x

K3

K2

K1

K0

n2

n1

 

 

 

 

 

 

 

 

 

0

n0

b6

b5

b4

b3

b2

b1

b0

 

 

 

 

 

 

 

 

 

Vector Type Identifier (V)

Table B-29 Numeric Vector Definitions

V2V1V0

Name

Description

 

 

 

 

 

 

011

Standard Numeric Format

No special formatting of characters is

 

 

specified.

 

 

 

100

Special Format Numeric Vector

Formatting of the received characters is

 

 

predetermined by special rules in the

 

 

host. See FLEX Message Word

 

 

Definitions on page -4.

 

 

 

111

Numbered Numeric Vector

The received information has been

 

 

numbered by the service provider to

 

 

indicate all messages have been properly

 

 

received.

 

 

 

Additional Bit Descriptors

Table B-30 Additional Bit Descriptor Definitions for Numeric Vector Packets

Designator

Definition

 

 

 

 

WN

This is the Word Number of vector (2–87 decimal) that describes the location of

 

the vector word in the frame.

eThis bit is set if more than 2 bit errors are detected in the word, if the check character calculation fails after error correction has been performed, or if the vector value is determined to be invalid.

pThese bits define the phase on which the vector was found (0 = a, 1 = b, 2 = c, 3 = d).

K

These are the beginning check bits of the message.

MOTOROLA

MC68175/D, Preliminary

B-27

SPI Packets

Decoder-to-Host Packet Descriptions

Table B-30 Additional Bit Descriptor Definitions for Numeric Vector Packets

Designator

Definition

nThese bits define the number of words in the message including the second vector word for long addresses (000 = 1 word message, 001 = 2 word message, etc.). For long addresses, the first message word is located in the word location that immediately follows the associated vector.

bThese bits define the word number of the message start in the message field (3–87 decimal). For long addresses, the word number indicates the location of the second message word.

x

These are unused bits. The value of these bits is not guaranteed.

B-28

MC68175/D, Preliminary

MOTOROLA

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