TSB12C01APZ datasheet(50/59 Pages) TI

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7–2

7.4.1

Phy Interface Has Control of the Bus

Table 7–1. Phy Interface Control of Bus Functions

CTL0,CTL1

NAME

DESCRIPTION OF ACTIVITY

Idle

No activity is occurring (this is the default mode).

Status

Status information is being sent from the phy layer to the TSB12C01A.

Receive

An incoming packet is being sent from the phy layer to the TSB12C01A.

Transmit

The TSB12C01A has been given control of the bus to send an outgoing packet.

7.4.2

TSB12C01A Has Control of the Bus

The TSB12C01A has control of the bus after receiving permission from the phy layer.

Table 7–2. TSB12C01A Control of Bus Functions

CTL0, CTL1

NAME

DESCRIPTION OF ACTIVITY

Idle

The TSB12C01A releases the bus (transmission has been completed).

Hold

The TSB12C01A is holding the bus while data is being prepared for transmission, or the

TSB12C01A wants to send another packet without arbitration.

Transmit

An outgoing packet is being sent from the TSB12C01A to phy layer.

Reserved

None

7.5

Request

A serial stream of information is sent across the LREQ terminal whenever the TSB12C01A needs to request

the bus or access a register that is located in the phy layer. The size of the stream varies depending on

whether the transfer is a bus request, a read command, or a write command. Regardless of the type of

transfer, 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.

Table 7–3. Request Functions

NUMBER

of BITS

NAME

Bus Request

Read Register Request

Write Register Request

7.5.1

LREQ Transfer

The definition of the bits in the three different types of transfers are shown in Table 7–4.

7.5.1.1

TSB12C01A Bus Request

Table 7–4. Bus-Request Functions (Length of Stream: 7 Bits)

BIT(S)

NAME

DESCRIPTION

Start Bit

Start bit indicates the beginning of the transfer (always set).

1–3

Request Type

Request type indicates the type of bus request (see Table 7–7 for the encoding of this

field).

4–5

Request Speed

Request speed indicates the speed at which the phy interface sends the packet for this

particular request (see Table 7–8 for the encoding of this field).

Stop Bit

Stop bit indicates the end of the transfer (always cleared).

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