Bitstream Composition - Bitstream Composition - UG570

UltraScale Architecture Configuration User Guide (UG570)
Document ID
UG570
Release Date
2025-03-04
Revision
1.20.1 English

After synchronization, the configuration logic processes each 32-bit data word as a configuration packet or component of a multiple word configuration packet. The following table shows the composition of a sample KU040 bitstream, generated using default settings.

Table 1. Sample KU040 Bitstream
Configuration Data Word (hex) Description
FFFFFFFF Dummy pad word, word 1
FFFFFFFF Dummy pad word, word 2
… Dummy pad words 3-15
FFFFFFFF Dummy pad word, word 16
000000BB Bus width auto detect, word 1
11220044 Bus width auto detect, word 2
FFFFFFFF Dummy pad word
FFFFFFFF Dummy pad word
AA995566 Sync word
20000000 NOOP
20000000 NOOP
30022001 Packet Type 1: Write TIMER register, WORD_COUNT = 1
00000000

TIMER[31:0] = 00000000 (hex)

(Placeholder for optional watchdog timer)
30020001 Packet Type 1: Write WBSTAR register, WORD_COUNT = 1
00000000

WBSTAR[31:0] = 00000000 (hex)

(Placeholder for optional MultiBoot next config address)
30008001 Packet Type 1: Write CMD register, WORD_COUNT=1
00000000

CMD[4:0] = 00000 (binary) = NULL

(Placeholder for optional MultiBoot next config reboot IPROG command)
20000000 NOOP
30008001 Packet Type 1: Write CMD register, WORD_COUNT=1
00000007

CMD[4:0]=00111 (binary) = RCRC (Reset CRC register)

(Bitstream CRC coverage begins here)
20000000 NOOP
20000000 NOOP
30002001 Packet Type 1: Write FAR register, WORD_COUNT=1
00000000 FAR (Frame address) = 00000000 (hex)
30026001 Packet Type 1: Write reserved/unused register, WORD_COUNT=1
00000000 Unused value = 00000000 (hex)
30012001 Packet Type 1: Write COR0 register, WORD_COUNT = 1
02003FE5

COR0[31:0] = 02003FE5 (hex)

(Sets configuration options, for example, EMCCLK, CCLK frequency, startup sequence)
3001C001 Packet Type 1: Write COR1 register, WORD_COUNT = 1
00000000

COR1[31:0] = 00000000 (hex)

(Sets configuration options, for example, BPI page mode)
30018001 Packet Type 1: Write IDCODE register, WORD_COUNT = 1
03822093

IDCODE[31:0] = 03822093 (hex)

(If written IDCODE does not match device IDCODE, then error)
30008001 Packet Type 1: Write CMD register, WORD_COUNT = 1
00000009 CMD[4:0]=01001 (binary) = SWITCH (change CCLK frequency)
20000000 NOOP
3000C001 Packet Type 1: Write MASK register, WORD_COUNT = 1
00000000 Bit mask for write to CTL0/CTL1 register. MASK[31:0] = 00000000 (hex)
3000A001 Packet Type 1: Write CTL0 register, WORD_COUNT = 1
00000501

CTL0[31:0] = 00000501 (hex) (Note: Also check prior MASK.)

(Sets configuration control options, for example, fallback, readback, etc.)
3000C001 Packet Type 1: Write MASK register, WORD_COUNT = 1
00000000 Bit mask for write to CTL0/CTL1 register. MASK[31:0] = 00000000 (hex)
30030001 Packet Type 1: Write CTL1 register, WORD_COUNT = 1
00000000

CTL1[31:0] = 00000000 (hex) (Note: Also check prior MASK.)

(Sets configuration control options; Reserved for future use)
20000000 NOOP
20000000 NOOP
20000000 NOOP
20000000 NOOP
20000000 NOOP
20000000 NOOP
20000000 NOOP
20000000 NOOP
30002001 Packet Type 1: Write FAR register, WORD_COUNT = 1
00000000 FAR (Frame address) = 00000000 (hex)
30008001 Packet Type 1: Write CMD register, WORD_COUNT = 1
00000001 CMD[4:0] = 00001 (binary) = WCFG (Write configuration data)
20000000 NOOP
30004000 Packet Type 1: Write FDRI register, WORD_COUNT = 0
503D0DA6 Packet Type 2: Write FDRI register, WORD_COUNT = 4,001,190
00000000 FDRI data word 1 (First bitstream configuration data word)
00000000 FDRI data word 2
… FDRI data words 3 – 4,001,189
00000000 FDRI data word 4,001,190 (Last bitstream configuration data word)
30000001 Packet Type 1: Write CRC register, WORD_COUNT = 1
C81874CB

CRC[31:0] = C81874CB (hex)

(If written CRC does not match computed CRC value, then error)
20000000 NOOP
20000000 NOOP
30008001 Packet Type 1: Write CMD register, WORD_COUNT = 1
0000000A CMD[4:0] = 01010 (binary) = GRESTORE (Pulse GRESTORE signal)
20000000 NOOP
30008001 Packet Type 1: Write CMD register, WORD_COUNT = 1
00000003 CMD = 00011 (binary) = DGHIGH/LFRM (De-assert GHIGH_B)
20000000 NOOP
… …
20000000 NOOP
30008001 Packet Type 1: Write CMD register, WORD_COUNT = 1
00000005 CMD[4:0] = 00101 (binary) = START (Begin STARTUP sequence)
20000000 NOOP
30002001 Packet Type 1: Write FAR register, WORD_COUNT = 1
03BE0000 FAR (Frame address) = 03BE0000 (hex)
3000C001 Packet Type 1: Write MASK register, WORD_COUNT = 1
00000100 Bit mask for write to CTL0/CTL1 register. MASK[31:0] = 00000100 (hex)
3000A001 Packet Type 1: Write CTL0 register, WORD_COUNT = 1
00000501

CTL0[31:0] = 00000501 (hex) (Note: Also check prior MASK.)

(Sets configuration control options, for example, fallback, readback, etc.)
30000001 Packet Type 1: Write CRC register, WORD_COUNT = 1
E3AD7EA5

CRC[31:0] = E3AD7EA5 (hex)

(If written CRC does not match computed CRC value, then error)
20000000 NOOP
20000000 NOOP
30008001 Packet Type 1: Write CMD register, WORD_COUNT = 1
0000000D CMD[4:0] = 01101 (binary) = DESYNC (Reset DALIGN) (Requires new Sync word)
20000000 NOOP (Pad remainder of bitstream with NOOPs)
… …
20000000 NOOP (End of bitstream)