TSB12C01APZ datasheet(51/59 Pages) TI

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7–3

7.5.1.2

TSB12C01A Read-Register Request

Table 7–5. Read-Register Request Functions (Length of Stream: 9 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 request function (see Table 7–7 for the encoding of this

field).

4–7

Address

These bits contain the address of the phy register to be read.

Stop Bit

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

7.5.1.3

TSB12C01A Write-Register Request

Table 7–6. Write-Register Request (Length of Stream: 17 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 request (see Table 7–7 for the encoding of this field).

4–7

Address

These bits contain the address of the phy register to be written to.

8–15

Data

These bits contain the data that is to be written to the specified register address.

Stop Bit

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

7.5.1.4

Request-Type Field for TSB12C01A Request

Table 7–7. TSB12C01A Request Functions

LREQ1 –

LREQ3

NAME

DESCRIPTION

000

TakeBus

Immediate request. Upon detection of an idle, take control of the bus immediately (no

arbitration) for asynchronous packet ACK response.

001

IsoReq

Isochronous request. IsoReq arbitrates for control of the bus after an isochronous gap.

010

PriReq

Priority request. PriReq arbitrates for control of the bus after a fair gap and ignores fair

protocol.

011

FairReq

Fair request. FairReq arbitrates for control of the bus after a fair gap and uses fair protocol.

100

RdReg

Read request. RdReg returns the specified register contents through a status transfer.

101

WrReg

Write request. WrReg writes to the specified register.

110, 111

Reserved

7.5.1.5

Request-Speed Field for TSB12C01A Request

Table 7–8. TSB12C01A Request-Speed Functions

LREQ4, LREQ5

DATA RATE

100 Mb/s

200 Mb/s

400 Mb/s

Reserved

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