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DXX.X

K28.5

DXX.X

DXX.X

K28.5

K28.5

DXX.X

DXX.X

DXX.X

DXX.X

DXX.X

K28.5

DXX.X

DXX.X

K28.5

K28.5

DXX.X

DXX.X

31Bit

Times

MaxReceive

PathLatency

WorstCase

MisalignedK28.5

MisalignmentCorrected

INPUTDATA

RBC0

RBC1

RD(0–9)

SYNC

CorruptData

30Bit

Times(Max)

Data Reception Latency

10-BitCode

RXP,RXN

RD(0–9)

RBC0

10-BitCode

RBC1

Testability

TLK1221

SLLS713 – FEBRUARY 2007

Figure 4. Word Realignment Timing Characteristic Waveforms

Systems that do not require framed data may disable byte alignment by tying SYNCEN low.

When a SYNC character is detected, the SYNC signal is brought high and is aligned with the K28.5 character.

The duration of the SYNC pulse is equal to the duration of the data.

The serial-to-parallel data latency is the time from when the first bit arrives at the receiver until it is output in the

aligned parallel word with RD0 received as the first bit. The minimum latency in TBI mode is 21 bit times and the

maximum latency is 31 bit times.

Figure 5. Receiver Latency, TBI Half-Rate Mode Shown

The loopback function provides for at-speed testing of the transmit/receive section of the circuitry. The enable

function allows for all circuitry to be disabled so that an Iddq test can be performed. The PRBS function also

allows for built-in self-test (BIST).

5

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