User's Manual

RTL8187B
Datasheet
Wireless LAN Network Interface Controller
27
Track ID: JATR-1076-21 Rev. 1.0
Offset# Bit# Symbol Description
28 31:16 FRAG_QSIZE Fragmentation Queue Size.
Upon sending the first frame of a fragmentation sequence, the driver writes the
queue size of the entire fragmentation exchange (including the first frame)
here. MAC uses this value when counting down TXOP. This field is valid
when TCR (0x40) duration processing fields are set to mode 1 or 2.
28 15 ENPMPD Enable Power Meter Pre-distortion Packet.
28 14 EN_BCKEY Enable broadcast/multicast key search when using Multiple BSSID
28 13:8 BCKEY Specify key to use in CAM for broadcast/multicast.
28 7 PT_EN Enable Power Tracking.
28 6 TPC_EN Enable TPC.
28 5:4 TPC_POLARITY TPC Polarity Select.
00: Neither increment nor decrement.
01: Increment.
10: Decrement.
11: Reserved.
28 3 TPC_DESEN TPC Descriptor AGC Enable.
0: Use the value of register TPC_TXAGC_OFDM as 54MHz TXAGC Base.
1: Use the value of AGC in the same descriptor as 54MHz TXAGC Base.
28 1:0 HWLengthSelect HW Length Select.
00: No Encryption.
01: RC4 Encryption.
10: AES Encryption.
11: Reserved.
11.1.2. Receive
Rx Descriptor Format
Table 29. Rx Descriptor Format
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
O
W
N
=
0
D
M
A
_
O
K
F
S
L
S
RSVD (11 bits)
U
D
R
T
O
K
RTS RC
(7 bits)
Packet RC
(8 bits)
Offset 0
RSVD
Offset 4
TX_BUFFER_ADDRESS
Offset 8
MPDUExchangeTime (16 bits) RSVD (4
bits)
Frame_Length (12 bits)
Offset 12
NEXT_TX_ DESCRIPTOR _ADDRESS
Offset 16
RSVD
Offset 20
RSVD
Offset 24
RSVD
Offset 28