MACsec Intel® FPGA IP User Guide

ID 736108
Date 6/26/2023
Public

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5.7.3. Byte Ordering

The Crypto QHIP/SIP implements little-endian byte order for the packet fields, For example, AAD and data where bits [7:0] contains the first byte of the corresponding field.
Table 55.  Example of Packet Fields Byte Order for Crypto QHIP
Ethernet Packet Field Crypto Field Crypto Interface aes_ip_app_tx_tdata
N/A IV[7:0] (Post byte order swapping) [7:0]
N/A .. [15:8]
N/A .. [23:16]
N/A .. [31:24]
N/A .. [39:32]
N/A .. [47:40]
N/A .. [55:48]
N/A .. [63:56]
N/A .. [71:64]
N/A .. [79:72]
N/A .. [87:80]
N/A IV[95:88] [95:88]
N/A AAD_LEN[7:0] [103:96]
N/A AAD_LEN[15:8] [111:104]
N/A AAD_LEN[23:16] [119:112]
N/A AAD_LEN[31:24] [127:120]
Dest Addr[47:40] AAD[7:0] [135:128]
Dest Addr[39:32] AAD[15:8] [143:136]
Dest Addr[31:24] AAD[23:16] [151:144]
Dest Addr[23:16] AAD[31:24] [159:152]
Dest Addr[15:8] AAD[39:32] [167:160]
Dest Addr[7:0] AAD[47:40] [175:168]
Src Addr[47:40] AAD[55:48] [183:176]
Src Addr[39:32] AAD[63:56] [191:184]
Src Addr[31:24] AAD[71:64] [199:192]
Src Addr[23:16] AAD[79:72] [207:200]
Src Addr[15:8] AAD[87:80] [215:208]
Src Addr[7:0] AAD[95:88] [223:216]
MACSEC Ethertype[15:8] AAD[103:96] [231:224]
MACSEC Ethertype[7:0] AAD[111:104] [239:232]
.. AAD[…:112] […:240]