ORSPI4 datasheet(107/263 Pages) LATTICE

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Lattice Semiconductor

ORCA ORSPI4 Data Sheet

107

iting word boundaries. The special characters K28.1, K28.5 and K28.7 contain this comma sequence and are

treated as valid comma characters by the SERDES.

The following table shows all of the valid special characters. All of the special characters are made available to the

FPGA logic; however only the comma characters are used by the SERDES logic. The different codings that are

possible for each data value are shown as encoded word (+) and encoded word (-). The table also illustrates the

8b/10b bit labeling convention. The bit positions of the 8-bit characters are labeled as H,G,F,E,D,C,B and A and the

bit positions of the 10-bit encoded characters are labeled as a, b, c, d, e, i, f, g, h, and j. The encoded words are

transmitted serially with bit 'a' transmitted ﬁrst and bit 'j' transmitted last.

Transmit Path (FPGA to Backplane) Logic

The transmitter section accepts four groups of either 8-bit unencoded data or 10-bit encoded data at the parallel

interface to the FPGA logic. It also uses the reference clock, REFCLK[P:N] to synthesize an internal high-speed

serial bit clock. The serialized transmitted data are available at the differential CML output pins to drive either an

optical transmitter, coaxial media or a circuit board backplane.

As shown in Figure 49, the basic blocks in the transmit path include:

SERDES/FPGA Interface and 4:1 Multiplexer

• Low speed parallel core/FPGA interface

• 4:1 multiplexer

Transmit SERDES

• 8b/10b Encoder

• 10:1 Multiplexer

• CML Output Buffer

Detailed descriptions of the logic blocks are given in following sections. Detailed descriptions of transmit clock dis-

tribution, including the transmit PLL are given in later sections of this data sheet.

Table 27. Valid Special Characters

K Character

HGF EDCBA

765 43210

K Control

Encoded Word (–)

Encoded Word (+)

abcdei fghj

K28.0

000 11100

001111 0100

110000 1011

K28.1 /comma/

001 11100

001111 1001

110000 0110

K28.2

010 11100

001111 0101

110000 1010

K28.3 /A/

011 11100

001111 0011

110000 1100

K28.4

100 11100

001111 0010

110000 1101

K28.5 /comma/

101 11100

001111 1010

110000 0101

K28.6

110 11100

001111 0110

110000 1001

K28.7 /comma/

111 11100

001111 1000

110000 0111

K23.7

111 10111

111010 1000

000101 0111

K27.7

111 11011

110110 1000

001001 0111

K29.7

111 11101

101110 1000

010001 0111

K30.7

111 11110

011110 1000

100001 0111

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