TSB41BA3DIPFP datasheet(45/59 Pages) TI

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LLC Service Request

Each cell represents one clock sample period, and n is the number of bits in the request stream.

LR1

LR2

LR3

LR (n-2)

LR0

LR (n-1)

TSB41BA3D

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The PHY initiates a transmit operation after winning control of the serial bus following a bus request by the LLC.

The transmit operation is initiated when the PHY grants control of the interface to the LLC.

Table 25 and Table 26 show the encoding of the CTL0–CTL1 bus.

Table 25. CTL Encoding When PHY Has Control of the Bus

CTL0

CTL1

NAME

DESCRIPTION

Idle

No activity (this is the default mode)

Status

Status information is being sent from the PHY to the LLC.

Receive

An incoming packet is being sent from the PHY to the LLC.

Grant

The LLC has been given control of the bus to send an outgoing packet.

Table 26. CTL Encoding When LLC Has Control of the Bus

CTL0

CTL1

NAME

DESCRIPTION

Idle

The LLC releases the bus (transmission has been completed).

Transmit

An outgoing packet is being sent from the LLC to the PHY.

Reserved

Holation

The LLC is holding the bus while data is being prepared for transmission, or the LLC is sending a

request to arbitrate for access to the bus, or the LLC is identifying the end of a subaction gap to the

PHY.

To request access to the bus, to read or write a PHY register, or to send a link notification to PHY, the LLC

sends a serial bit stream on the LREQ terminal as shown in Figure 23.

Figure 23. LREQ Request Stream

The length of the stream varies depending on the type of request as shown in Table 27.

Table 27. Request Stream Bit Length

REQUEST TYPE

NUMBER OF BITS

Bus request

Read register request

Write register request

Link notification request

PHY-link interface reset request

Regardless of the type of request, a start bit of 1 is required at the beginning of the stream and a stop bit of 0 is

required at the end of the stream. The second through fifth bits of the request stream indicate the type of the

request. In the following descriptions, bit LR1 is the most significant and is transmitted first in the request bit

stream. The LREQ terminal is normally low.

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