MEDIATEK Ralink MT7620 - Page 474

PGMT7620_V.1.0_040503
Page 474 of 523
MT7620 PROGRAMMING GUIDE
Integrated 802.11n MAC/BBP and 2.4 GHz RF/FEM Router-on-a-Chip
3.1.2.2 WAPI_PN Format
Offset
Type
Name
Description
Initial Value
0x00
RW
WAPI_PN_MSB
WAPI PN byte11 to byte8
*
0x04
RW
WAPI_PN_MSB
WAPI PN byte15 to byte12
*
Table 3-2 WAPI_PN Format
NOTE:
1. The key index and extension IV bit are initialized by software. The MSB octet of IV is not modified by
hardware.
2: IV/EIV packet number (PN) counter modes:
 For WEP40, WEP104, CKIP40, CKIP104, CKIP128 mode, PN=IV[23:0]. EIV[31:0] is not used.
 For TKIP mode, PN = {EIV[31:0], IV[7:0], IV[23:16]}, IV[15:8]=(IV[7:0] | 0x20) & 0x7F) is generated by
hardware.
 For AES-CCMP, PN = {EIV[31:0], IV[15:0]}.
 For non-WAPI mode, PN = PN + 1 after each encryption.
 For WAPI mode, PN={WAPI_PN_MSB_1[31:0], WAPI_PN_MSB_0[31:0], EIV[31:0], IV[31:0]}.
 For WAPI mode, PN=PN+2 when WAPI_MC_BC=0 in WCID attribute.
 For WAPI mode, PN=PN+1 when WAPI_MC_BC=1 in WCID attribute.
3: Software may initialize the PN counter to any value.
3.1.3 WCID Attribute Entry Format (1DW)
Offset
Type
Name
Description
Initial Value
31:24
RW
WAPI_KEYID_BYTE
WAPI KeyID Byte
0-1: WAPI Key ID
2-255: reserved
*
23:16
RW
WAPI_RSV_BYTE
WAPI Reserved Byte
(set to 0)
*
15
RW
WAPI_MCBC
WAPI Broadcast/Multicast Packet Number (PN)
Increment
0: Unicast, PN = PN + 2
1: Multicast/broadcast, PN = PN + 1
*
14:12
RW
-
Reserved
*
11
RW
BSS_IDX_MBS
Use together with BSS_IDX(bit[6:4)),
(BSS_IDX_MSB *8 + BSS_IDX) = BSS Index of the
WCID
*
10
RW
RX_PKEY_MODE_MSB
Use together with RX_PKEY_MODE(bit[3:1]),
(RX_PKEY_MODE_MSB *8 + RX_PKEY_MODE) =
0:7: As listed in RX_PKEY_MODE
8: WAPI
9:15: Reserved
*
9:7
RW
RXWI_UDF
RXWI User Defined Field
This field is tagged in the RXWI.UDF fields for the
WCID.
*
6:4
RW
BSS_IDX
Multiple-BSS index for the WCID
*