RTL8181 ETC, RTL8181 Datasheet - Page 41

• Manufacturer Part Number: RTL8181
• Description: Wireless LAN Access Point/Gateway Controller
• Manufacturer: ETC

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Transmit Configuration Register (WLAN_TCR)
This register defines the Transmit Configuration for the WLAN controller. It controls such functions as loopback, heartbeat,
auto transmit padding, programmable inter- frame gap, fill and drain thresholds, and maximum DMA burst size.
Bit
31
30
29-25
24
23-21
20
19
18-17
16
15-8
7-0
Receive Configuration Register (WLAN_RCR)
This register is used to set the receive configuration for the WLAN controller. Receive properties such as accepting error
packets, runt packets, setting the receive drain threshold etc. are controlled here.
Bit
31
30
CONFIDENTIAL
Symbol
CWMIN
SEQGEN
-
SAT
MXDMA2, 1,
0
DISCW
ICV
LBK1, LBK0 Loopback Test: There will be no packet on the TXI+/- and TXQ+/- lines under the
CRC
SRL
LRL
Bit Name
ONLYERLP
KT
ENCS2
Description
Contention Window minimum value: Set to 1 to indicate that Cwmin=8. Set to 0 to indicate
that Cwmin=32.
Sequence number generation switch.
0 – Enabled. Sequence number is generated by RTL8181.
1 – Disabled. Sequence number should be filled by software.
Reserved
Set ACK Timeout: The EIFS, ACK and CTS timeouts are derived from the following
equation:
EIFS = 112/ACKrate + 252
1: ACKrate is dependent on the maximum of MBR (bits 1:0, BRSR) and Rx DATA/RTS
rate.
0: ACKrate is fixed at 1Mbps.
Max DMA Burst Size per Tx DMA Burst: This field sets the maximum size of trans mit
DMA data bursts according to the following table:
000: 16 bytes
001: 32 bytes
010: 64 bytes
011: 128 bytes
100: 256 bytes
101: 512 bytes
110: 1024 bytes
111: 2048 bytes
Disable Contention Window Backoff: This bit indicates the existence of a backoff procedure
during packet transmission.
1: No random backoff procedure
0: Uses IEEE 802.11 random backoff procedure
Append ICV: This bit indicates the existence of ICV appended at the end of an encipherment
packet.
1: No ICV appended
0: ICV appended
Loopback test condition. The loopback function must be independent of the link state.
00: Normal operation
01: MAC Loopback
10: Baseband Loopback
11: Continue TX.
Append CRC32: This bit indicates the existence of a CRC32 appended at the end of a
packet.
1: No CRC32 appended
0: A CRC32 is appended
RTS Retry Limit: Indicates the maximum retry times of RTS frame, data or management
frame of length less than or equal to RTSThreshold.
Data Packet Retry Limit: Indicates the maximum retransmission times of Data or
Management frame of length greater than RTSThreshold.
Description
Early Receiving based on Packet Size: Early Receiving is only performed for packets with a
size greater than 1536 bytes.
Enable Carrier Sense Detection Method 2
41
RTL8181
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
v1.0