OR4 datasheet(63/152 Pages) LATTICE

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Lattice Semiconductor

Data Sheet

May, 2006

ORCA Series 4 FPGAs

Conﬁguration Data Format (continued)

Table 31. Conﬁguration Frame Format and Contents

Table 31A. Conﬁguration Frame Format and Contents for Embedded Block RAM

Frame

Contents

Description

Header

11110010

Preamble for generic FPGA.

24-bit length count

Conﬁguration bitstream length.

11111111

8-bit trailing header.

ID Frame

0101 1111 1111 1111

ID frame header.

44 reserved bits

Reserved bits set to 0.

Part ID

20-bit part ID.

Checksum

8-bit checksum.

11111111

8 stop bits (high) to separate frames.

FPGA Header

1111 0010

This is a new mandatory header for generic portion.

11111111

8 stop bits (high) to separate frames.

FPGA Address Frame

Address frame header.

14-bit address

14-bit address of generic FPGA.

Checksum

8-bit checksum.

11111111

Eight stop bits (high) to separate frames.

FPGA Data Frame

Data frame header. same as generic.

Alignment bits

String of 0 bits added to frame to reach a byte bound-

ary.

Data bits

Number of data bits depends upon device.

Checksum

8-bit checksum.

11111111

Eight stop bits (high) to separate frames.

Postamble for Generic

FPGA

00 or 10

Postamble header, 00 = ﬁnish, 10 = more bits coming.

11111111 111111

Dummy address.

11111111 11111111

16 stop bits (high).

Frame

Contents

Description

RAM Header

11110001

A mandatory header for RAM bitstream portion.

11111111

8 stop bits (high) to separate frames.

RAM Address Frame

Address frame header. same as generic.

6-bit address

6-bit address of RAM blocks.

Checksum

8-bit checksum.

11111111

Eight stop bits (high) to separate frames.

RAM Data Frame

Data frame header. same as generic.

000000

Six of 0 bits added to reach a byte boundary.

512x18 data bits

Exact number of bits in a RAM block.

Checksum

8-bit checksum.

11111111

Eight stop bits (high) to separate frames.

Postamble for RAM

00 or 10

Postamble header. 00 = ﬁnish, 10 = more bits coming.

111111

Dummy address.

11111111 11111111

16 stop bits (high).

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