| Constant |
- The user-defined data byte is constantly sent on
all bytes of the Write data beat.
- You can set the data byte value in the
wdata_pat_value CSV field.
- For example, if
wdata_pat_value = 0x032,
AXI Data Width = 64, and
axi_size = 3, all the
data_beat values of the
given instruction is sent as 0x3232_3232_3232_3232.
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| SAME_AS_ADDR |
- The corresponding AXI beat byte address (LSB 8
bits) is sent as data in the bytes of the Write beat.
- You can select the
same_as_addr data pattern by setting the wdata_pat_value CSV field to
0x100.
- For example, if
wdata_pat_value = 0x100, AXI Data Width = 64, axi_addr = 0x0200_0000_11A0, axi_burst = INCR, axi_len = 3, and axi_size = 3, data beats are
generated as follows:
- Byte_Lane0 address on Beat0=
0x0200_0000_11A0 --> LSB 8 bits are A0 which are sent
as Write data on byte_lane0 of beat0.
- Byte_Lane1 address on Beat0=
0x0200_0000_11A1 --> LSB 8 bits are A1 which are sent
as Write data on byte_lane1 of beat0.
- Beat0 = 0xA7A6_A5A4_A3A2_A1A0
- Beat1 = 0xAFAE_ADAC_ABAA_A9A8
- Beat2 = 0xB7B6_B5B4_B3B2_B1B0
- Beat3 = 0xBFBE_BDBC_BBBA_B9B8
|
| SAME_AS_ADDR_XOR |
- The corresponding AXI beat byte address is
bytewise folded, XORed, and sent as data in the bytes of the
Write beat.
- You can select the
same_as_addr_xor data pattern by setting the
wdata_pat_value CSV field
to 0x101.
- For example, if
wdata_pat_value = 0x101, AXI Data Width = 64, axi_addr = 0x0200_0000_11A0, axi_burst = INCR, axi_len = 3, and axi_size = 3, data beats are
generated as follows:
- Byte_Lane0 address on Beat0=
0x0200_0000_11A0 --> 0x02^0x00^0x00^0x00^0x11^0xA0=
0x B3. It is sent as Write data on byte_lane0 of
beat0.
- Byte_Lane1 address on Beat0=
0x0200_0000_11A1 --> 0x02^0x00^0x00^0x00^0x11^0xA1=
0x B2. It is sent as Write data on byte_lane1 of
beat0.
- Beat0 = 0xB4B5_B6B7_B0B1_B2B3
- Beat1 = 0xBCBD_BEBF_B8B9_BABB
- Beat2 = 0xA4A5_A6A7_A0A1_A2A3
- Beat3 = 0xACAD_AEAF_A8A9_AAAB
|
| Hammer |
Note: Hammer data is only supported on full
transfer AXI transactions for the Synthesizable TG. Selecting hammer
data on a narrow transfer might result in unpredictable
behavior.
- Hammer data has a long number of tail bits
(MSBs) with value 0 or 1 and a short number of header bits
(LSBs) with an inverted bit value in a data beat. The values of
the tail bits (width of ¾ of
axi_size_in_bits) and header bits (width of ¼ of
axi_size_in_bits) are
generated based on the corresponding AXI beat address. If the
resulting value of beat_start_address divided by axi_size_in_bytes is even the
header bits are 1 and the tail bits are 0. If the resulting
value is odd the header bits are 0 and tail bits are 1.
- You can select the hammer data pattern by
setting the
wdata_pat_value CSV
field to 0x102.
For example, if wdata_pat_value =
0x102, AXI Data Width = 64, axi_addr = 0x0000_0000_11A5, axi_burst = INCR, axi_len = 3, and axi_size
= 3, data beats are generated as follows:
-
header_width =
axi_size_in_bits/4 = 64/4 =
16
-
tail_width =
(axi_size_in_bits*3)/4 = (64*3)/4 = 48
- Beat0 calculation:
Aligned(beat_start_address)/axi_size_in_bytes = 0x0000_0000_11A0/8 =
0x234(even value)
So, header bits are
16{{1’b1}} and tail bits are 48{{1’b0}}.
Beat0 = 0x0000_0000_0000_FFFF
- Beat1 calculation:
Aligned(beat_start_address)/axi_size_in_bytes = 0x0000_0000_11A8/8 =
0x235(odd value)
So, header bits are
16{{1’b0}} and tail bits are 48{{1’b1}}.
Beat1 = 0xFFFF_FFFF_FFFF_0000
- Beat2 calculation:
Aligned(beat_start_address)/axi_size_in_bytes = 0x0000_0000_11B0/8 =
0x236(even value)
So, header bits are
16{{1’b1}} and tail bits are 48{{1’b0}}.
Beat2 = 0x0000_0000_0000_FFFF
- Beat3 calculation:
Aligned(beat_start_address)/axi_size_in_bytes = 0x0000_0000_11B8/8 =
0x237(odd value)
So, header bits are
16{{1’b0}} and tail bits are 48{{1’b1}}.
Beat3 = 0xFFFF_FFFF_FFFF_0000
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