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SPI Packets

 

 

 

 

 

 

 

 

 

 

Decoder-to-Host Packet Descriptions

 

 

 

Table B-36 Short Instruction Vector Definition

 

 

 

 

 

i2i1i0

d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0

Description

 

 

 

 

 

 

111

 

 

Reserved for test

 

 

 

 

 

 

Note:

1.

Assigned temporary address (a) and assigned frame (f). See Appendix C for additional

 

 

 

information.

 

 

 

 

2.

i = Instruction type—These bits define the meaning of the d bits in this packet.

 

 

 

x = Unused bits—The value of these bits is not guaranteed.

 

 

 

 

 

 

Message Packet

The Message Field follows the Vector Field in the FLEX protocol. It contains the message data, checksum information, and may contain fragment numbers and message numbers. See Appendix A for additional information. If the error bit of a vector word is not set and the vector word indicates that there are message words associated with the page, the message words are sent in Message Packets. The ID of the Message Packet is the word number where the message word was received in the frame.

Table B-37 Message 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

i20

i19

i18

i17

i16

1

i15

i14

i13

i12

i11

i10

i9

i8

0

i7

i6

i5

i4

i3

i2

i1

i0

 

 

 

 

 

 

 

 

 

Note: WN = Word number of message word (3–87 decimal)—Describes the location of the message word in the frame

e is set if more than 2 bit errors are detected in the word.

p = Phase on which the message word was found (0 = a, 1 = b, 2 = c, 3 = d)

i = information bits of the message word—The definitions of these bits depend on the vector type and which word of the message is being received. See Appendix A for a detailed description of these bits.

MOTOROLA

MC68175/D, Preliminary

B-31

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