TSB41BA3D datasheet(46/59 Pages) TI

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TSB41BA3D

SLLS959A – DECEMBER 2008 – REVISED MARCH 2009 ............................................................................................................................................... www.ti.com

Table 28 shows the encoding for the request type.

Table 28. Request Type Encoding

LR1–LR4

NAME

DESCRIPTION

0000

Reserved

0001

Immed_Req

Immediate request. On detection of idle, the PHY arbitrates for the bus.

0010

Next_Even

Next even request. The PHY arbitrates for the bus to send an asynchronous packet in the even fairness

interval phase.

0011

Next_Odd

Next odd request. The PHY arbitrates for the bus to send an asynchronous packet in the odd fairness

interval phase.

0100

Current

Current request. The PHY arbitrates for the bus to send an asynchronous packet in the current fairness

interval.

0101

Reserved

0110

Isoch_Req_Even

Isochronous even request. The PHY arbitrates for the bus to send an isochronous packet in the even

isochronous period.

0111

Isoch_Req_Odd

Isochronous odd request. The PHY arbitrates for the bus to send an isochronous packet in the odd

isochronous period.

1000

Cyc_Start_Req

Cycle start request. The PHY arbitrates for the bus to send a cycle start packet.

1001

Reserved

1010

Reg_Read

1011

Reg_Write

1100

Isoch_Phase_Even Isochronous phase even notification. The link reports to the PHY that:

1) A cycle start packet has been received.

2) The link has set the isochronous phase to even.

1101

Isoch_Phase_Odd

Isochronous phase odd notification. The link reports to the PHY that:

1) A cycle start packet has been received.

2) The link has set the isochronous phase to odd.

1110

Cycle_Start_Due

Cycle start due notification. The link reports to the PHY that a cycle start packet is due for reception.

1111

Reserved

For a bus request, the length of the LREQ bit stream is 11 bits as shown in Table 29.

Table 29. Bus Request

BIT(s)

NAME

DESCRIPTION

Start bit

Indicates the beginning of the transfer (always 1)

1–4

Request type

Indicates the type of bus request. See Table 28.

Request format

Indicates the packet format to be used for packet transmission. See Table 30.

6–9

Request speed

Indicates the speed at which the link sends the data to the PHY. See Table 31 for the encoding of this field.

Stop bit

Indicates the end of the transfer (always 0). If bit 6 is 0, then this bit can be omitted.

Table 30 shows the 1-bit request format field used in bus requests.

Table 30. Bus Request Format Encoding

LR5

DATA RATE

Link does not request either Beta or legacy packet format for bus transmission

Link requests Beta packet format for bus transmission

Table 31 shows the 4-bit request speed field used in bus requests.

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