TSB12C01APZ datasheet(36/59 Pages) TI

36 / 59 page

4–6

Table 4–6. Isochronous-Receive Functions

FIELD NAME

DESCRIPTION

dataLength

This field indicates the number of bytes in this packet

TAG

This field indicates the format of data carried by isochronous packet (00 = formatted, 01 – 11 are

reserved).

chanNum

This field contains the channel number with which this data is associated

tCode

This field carries the transaction code for this packet (tCode = Ah).

This field carries the transaction layer-specific synchronization bits.

isochronous data

This field has the data to be sent with this packet. The first byte of data must appear in byte 0 of

the first quadlet of this field. The last quadlet should be padded with zeros.

spd

This field indicates the speed at which this packet was sent.

errCode

This field indicates whether this packet was received correctly. The possibilities are Complete,

DataErr, or CRCErr and have the same encoding as the corresponding acknowledge codes.

4.4

Snoop

The format of the snoop data is shown in Figure 4–7. The receiver module can be directed to receive any

and all packets that pass by on the serial bus. In this mode, the receiver presents the data received to the

receive-FIFO interface.

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

snooped_data

spd

ackSnpd

snpStat

Figure 4–7. Snoop Format

Table 4–7. Snoop Functions

FIELD NAME

DESCRIPTION

snooped_data

This field contains the entire packet received or as much as could be received.

spd

This field carries the speed at which this packet was sent.

snpStat

This field indicates whether the entire packet snooped was received correctly. A value equal to the

complete acknowledge code indicates complete reception. A busyA or busyB acknowledge code

indicates incomplete reception.

ackSnpd

This field indicates the acknowledge seen on the bus after the packet is received.

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