bitstream_format.rst

Bitstream format

Basic Structure

Bitstream file starts with comment section, that contains plain text with metadata about project. It finishes with empty line.

Example:

# Anlogic Infotech Corporation ASCII Bitstream
# Version: 4.2.885
# Design name: system
# Architecture: eagle_s20
# Package: BG256
# Date: 2018/11/14 10:50
# Bitstream CRC: 0111010001100000
# USER CODE: 00000000000000000000000000000000

After that data is packed in blocks. Before each block there is a 16 bit big-endian value containing size in bits of block data.

Example:

Size	Data
0080	ffffffffffffffffffffffffffffffff
0080	ffffffffffffffffffffffffffffffff
0020	cc55aa33
0050	f00000060a014c35a3bd
0050	c20000066900050089a5

First three blocks are presenting bitstream start signature. Data also finish with thwo all-ff blocks.

Command	Flag	Size	Data (CRC if flag 0)	Description
f0	00	0006	0a014c35 a3bd	Device ID
c2	00	0006	69000500 89a5	CFG_1
c3	00	0006	d0b04bb0 43f3	CFG_2
c7	00	0006	04eb01e8 2ac6	FRAMES
c8	00	0006	00000480 9888
c1	00	0006	00000000 13be	VERSION_UCODE
ca	00	0006	00000000 a384
c5	00	0006	00000038 c333
f1	00	0004	0000 78af	RESET_CRC
f3	00	00a0	xxxxxxxx xxxx
ec	f0	0001		This is number of blocks to follow + 1 block of 78 zeros
f7	00	0004	0000 e8aa	Done

CRC algorithm used is: CRC-16/BUYPASS

Family : AL3

FRAMES:1075 BYTES_PER_FRAME:257 (2056 bits) BYTES_PER_MEM_FRAME:1152 (9216 bits)

Device	Part	Package	Device ID
AL3A06LG144C7	al3_6	LQFP144	10006c31
AL3A06BG256C7	al3_6	BGA256	10006c31
AL3A10LG144C7	al3_10	LQFP144	18006c31
AL3A10BG256C7	al3_10	BGA256	18006c31
AL3A10BG256B	al3_10	BGA256B	14006c31
AL3S10LG144	al3_s10	LQFP144	12006c31 *
AL3S10NG88	al3_s10	QFN88	12006c31 *
AL3A10NG88	al3_s10	QFN88	12006c31 *

* device id not written in bitstream at all

Family : EF1

Device	Part	Package	Device ID
EF1L300LG100	elf_3	LXLQFP100	112d0c33
EF1A300LG100	elf_3	AMLQFP100	152d0c33
EF1A300LG44	elf_3	AMLQFP44	122d0c33
EF1L650LG100	elf_6	LXLQFP100	012d0c33
EF1L650LG144	elf_6	LXLQFP144	002d0c33
EF1A650LG100	elf_6	AMLQFP100	052d0c33
EF1A650LG144	elf_6	AMLQFP144	042d0c33

Family : EF2

FRAMES:765 BYTES_PER_FRAME:204 (1632 bits) BYTES_PER_MEM_FRAME:1152 (9216 bits)

Device	Part	Package	Device ID
EF2L15LG100B	ef2_1	EF2L15LG100B	04004c37
EF2L15LG144B	ef2_1	EF2L15LG144B	04004c37
EF2L15BG256B	ef2_1	EF2L15BG256B	04004c37
EF2L25XG42B	ef2_2	EF2L25XG42B	01004c37
EF2L25BG256B	ef2_2	EF2L25BG256B	01004c37
EF2L45LG144B	ef2_4	EF2L45LG144B	03004c37
EF2L45BG256B	ef2_4	EF2L45BG256B	03004c37
EF2M45LG64B	ef2_4	EF2M45LG64B	00004c37
EF2M45LG48B	ef2_4	EF2M45LG48B	00004c37
EF2S45VG81C	ef2_s4	EF2S45VG81C	02004c37
EF2M45VG81C	ef2_s4	EF2M45VG81C	02004c37

Family : EF3

ef3_1 and ef3_2 FRAMES:765 BYTES_PER_FRAME:204 (1632 bits) BYTES_PER_MEM_FRAME:1152 (9216 bits)

ef3_4 and ef4_9 FRAMES:1046 BYTES_PER_FRAME:286 (2288 bits) BYTES_PER_MEM_FRAME:1152 (9216 bits)

Device	Part	Package	Device ID
EF3L15CG256B	ef3_1	EF3L15CG256B	09004c37
EF3L25CG256B	ef3_2	EF3L25CG256B	0a004c37
EF3L40CG332B	ef3_4	EF3L40CG332B	02008c3b
EF3L40CG324B	ef3_4	EF3L40CG324B	04008c3b
EF3L90CG400B	ef3_9	EF3L90CG400B	00008c3b

Family : EG4

FRAMES:1259 BYTES_PER_FRAME:488 (3904 bits) BYTES_PER_MEM_FRAME:1152 (9216 bits)

Device	Part	Package	Device ID
EG4X15BG256	eagle_15	BGA256X	00014c35
EG4A15BG256	eagle_15	BGA256A	0e014c35
EG4X20BG256	eagle_20	BGA256X	00014c35
EG4A20BG256	eagle_20	BGA256A	08014c35
EG4A20NG88	eagle_20	QFN88	0c014c35
EG4D20EG176	eagle_s20	EQFP176	04014c35
EG4S20BG256	eagle_s20	BG256	0a014c35
EG4S20NG88	eagle_s20	QFN88	06014c35
EG4S20CG324	eagle_s20	CG324	02014c35