TSB12C01APZ datasheet(33/59 Pages) TI

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4–3

quadlet contain the node and bus ID of the source, and the remaining 16 bits of the second and third quadlets

contain the 48-bit, quadlet-aligned destination offset address. The fourth quadlet contains data that was

used by write requests and read responses. For read requests and write responses, the quadlet data field

is omitted. The last quadlet contains packet-reception status, added by the TSB12C01A.

1 2 3

5 6 7

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

spd

tLabel

tCode

priority

sourceID

destinationOffsetHigh

destinationOffsetLow

quadlet data (for write request and read response)

ackSent

destinationID

Figure 4–3. Quadlet-Receive Format

Table 4–3. Quadlet-Receive Format Functions

FIELD NAME

DESCRIPTION

destinationID

This is the concatenation of the 10-bit bus number and the 6-bit node number that forms the

node address to which this packet is being sent.

tLabel

This field is the transaction label, which is a unique tag for each outstanding transaction

between two nodes. This is used to pair up a response packet with its corresponding request

packet.

The retry code for this packet is 00 = new, 01 = retry_X, 10 = retryA, and 11 = retryB.

tCode

tCode is the transaction code for this packet. (See Table 6–10 of the IEEE 1394-1995

standard).

priority

The priority level for this packet. For cable implementation, the value of the bits must be zero.

For backplane implementation, see clause 5.4.1.3 and 5.4.2.1 of the IEEE 1394-1995

standard.

sourceID

This is the node ID of the sender of this packet.

destination OffsetHigh,

destination OffsetLow

The concatenation of these two fields addresses a quadlet in the destination node’s address

space. This address must be quadlet aligned (modulo 4). (The upper four bits of the

destination OffsetHigh field are used as the response code for lock-response packets, and

the remaining bits are reserved.)

quadlet data

For write requests and read responses, this field holds the transferred data. For write

responses and read requests, this field is not present.

spd

This field indicates the speed at which this packet was sent. 00 = 100 Mb/s, 01 = 200 Mb/s,

10 = 400 Mb/s, and 11 is undefined for this implementation.

ackSent

This field holds the acknowledge sent by the receiver for this packet. (See Table 6–13 in the

draft standard.)

4.1.4

Block Receive

The block-receive format is shown in Figure 4–4. The first 16 bits of the first quadlet contain the node and

bus ID of the destination node, and the last 16 bits contain packet-control information. The first 16 bits of

the second quadlet contain the node and bus ID of the source node, and the last 16 bits of the second

quadlet and all of the third quadlet contain the 48-bit, quadlet-aligned destination offset address. All

remaining quadlets, except for the last one, contain data that is used only for write requests and read

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