TLK10002 datasheet(13/73 Pages) TI1

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TLK10002

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SLLSE75

– MAY 2011

Lane Alignment Components

•

Lane Alignment Master (LAM)

– Responsible for generating proprietary LS lane alignment initialization pattern

– Resides in the TLK10002 LS receiver (one instance in Channel A, one instance in Channel B)

– Responsible for bringing up LS receive link for the data sent from the TLK10002 to a link partner

device

– Monitors the LS_OK_IN_A/B pins for “Link Status OK” signals sent from the Lane Alignment Slave

(LAS) of the link partner device

– Resides in the link partner device (one instance in Channel A, one instance in Channel B)

– Responsible for bringing up LS transmit link for the data sent from the link partner device to the

TLK10002

– Monitors the “Link Status OK” signals sent from the LS_OK_OUT_A/B pins of the Lane Alignment

Slave (LAS) of the TLK10002

•

Lane Alignment Slave (LAS)

– Responsible for monitoring the LS lane alignment initialization pattern

– Performs channel synchronization per lane (2 or 4 lanes) through byte rotation

– Performs lane alignment and realignment of bytes across lanes

– Resides in the TLK10002 LS transmitter (one instance in Channel A, one instance in Channel B)

– Generates the “Link Status OK” signal for the LAM on the link partner device

– Resides in the link partner device (one instance in Channel A, one instance in Channel B)

– Generates the “Link Status OK” signal for the LAM on the TLK10002 device.

Lane Alignment Operation

During lane alignment, the LS transmitter (LAM) sends a repeating pattern of 49 characters (control + data)

simultaneously across all enabled LS lanes. These simultaneous streams are then encoded by 8B/10B encoders

in parallel. The proprietary lane alignment pattern consists of the following characters:

/K28.5/ (CTL=1, Data=0xBC)

Repeat the following sequence of 12 characters four times:

/D30.5/ (CTL=0, Data=0xBE)

/D23.6/ (CTL=0, Data=0xD7)

/D3.1/ (CTL=0, Data=0x23)

/D7.2/ (CTL=0, Data=0x47)

/D11.3/ (CTL=0, Data=0x6B)

/D15.4/ (CTL=0, Data=0x8F)

/D19.5/ (CTL=0, Data=0xB3)

/D20.0/ (CTL=0, Data=0x14)

/D30.2/ (CTL=0, Data=0x5E)

/D27.7/ (CTL=0, Data=0xFB)

/D21.1/ (CTL=0, Data=0x35)

/D25.2/ (CTL=0, Data=0x59)

The above 49-character sequence is repeated until LS_OK_IN_A/B is asserted. Once LS_OK_IN_A/B is

asserted, the LAM resumes transmitting traffic received from the high speed side SERDES immediately.

The TLK10002 performs lane alignment across the lanes similar in fashion to the IEEE 802.3ae-2002 (XAUI)

specification. XAUI only operates across 4 lanes while LAS operates with 2 or 4 lanes. The lane alignment state

machine is shown in Figure 9. The comma (K28.5) character is used for lane to lane alignment instead of XAUI

’s

/A/ character.

Lane alignment checking is not performed by the LAS after lane alignment is achieved. After LAM detects that

the LS_OK_IN_A/B signal is asserted, normal system traffic is carried instead of the proprietary lane alignment

pattern.

Channel Synchronization is performed during lane alignment and normal system operation.

TLK10002 Datasheet(PDF) 13 Page - Texas Instruments

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