User's Manual

RTL8187B
Datasheet
Wireless LAN Network Interface Controller
25
Track ID: JATR-1076-21 Rev. 1.0
Offset# Bit# Symbol Description
Tx Rate.
These five bits indicate the current frame’s transmission rate.
Bit 27 Bit 26 Bit 25 Bit 24
1Mbps 0 0 0 0
2Mbps 0 0 0 1
5.5Mbps 0 0 1 0
11Mbps 0 0 1 1
6Mbps 0 1 0 0
9Mbps 0 1 0 1
12Mbps 0 1 1 0
18Mbps 0 1 1 1
24Mbps 1 0 0 0
36Mbps 1 0 0 1
48Mbps 1 0 1 0
54Mbps 1 0 1 1
0 27:24 TXRATE
Reserved All other combinations
0 23 RTSEN RTS Enable.
Set to 1 indicates that an RTS/CTS handshake shall be performed at the
beginning of any frame exchange sequence where the frame is of type Data or
Management, the frame has an unicast address in the Address1 field, and the
length of the frame is greater than RTSThreshold.
RTS Rate.
These four bits indicate the RTS frame’s transmission rate before transmitting
the current frame and will be ignored if the RTSEN bit is set to 0.
Bit 22 Bit 21 Bit 20 Bit 19
1Mbps 0 0 0 0
2Mbps 0 0 0 1
5.5Mbps 0 0 1 0
11Mbps 0 0 1 1
6Mbps 0 1 0 0
9Mbps 0 1 0 1
12Mbps 0 1 1 0
18Mbps 0 1 1 1
24Mbps 1 0 0 0
36Mbps 1 0 0 1
48Mbps 1 0 1 0
54Mbps 1 0 1 1
0 22:19 RTSRATE
Reserved All other combinations
0 18 CTSEN CTS Enable.
Both RTSEN and CTSEN set to 1 indicates that the CTS-to-self protection
mechanism will be used.
0 17 MOREFRAG More Fragment.
This bit is set to 1 in all data type frames that have another fragment of the
current packet to follow.
0 16 SPLCP Short Physical Layer Convergence Protocol format.
When set, this bit indicates that a short PLCP preamble will be added to the
header before transmitting the frame.