
DS33Z11 Ethernet Mapper
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
120 of 169
SU.RMFSRL
Receiver Maximum Frame Low Register
158h
7
6
5
4
3
2
1
0
RMPS7
1
RMPS6
1
RMPS5
1
RMPS4
0
RMPS3
0
RMPS2
0
RMPS1
1
RMPS0
0
Bits 7- 0: Receiver Maximum Frame (RMPS[0:7])
Eight bits of sixteen-bit value. Register description below.
Register Name:
SU.RMFSRH
Register Description:
Receiver Maximum Frame High Register
Register Address:
159h
Bit #
7
6
5
Name
RMPS15
RMPS14
RMPS13
RMPS12
Default
0
0
0
4
3
2
1
0
RMPS11
0
RMPS10
1
RMPS9
1
RMPS8
1
0
Bits 7- 0: Receiver Maximum Frame (RMPS[8:15])
This value is the receiver’s maximum frame size (in bytes),
up to a maximum of 2016 bytes. Any frame received greater than this value is rejected. The frame size includes
destination address, source address, type/length, data and crc-32. The frame size is not the same as the frame
length encoded within the IEEE 802.3 frame.
Any values programmed that are greater than 2016 will have
unpredictable behavior and should be avoided.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
SU.RQLT
Receive Queue Low Threshold (Watermark)
15Ah
7
6
5
4
3
2
1
0
RQLT7
0
RQLT6
0
RQLT5
1
RQLT4
1
RQLT3
0
RQLT2
1
RQLT1
1
RQLT0
1
Bits 0 - 7: Receive Queue Low Threshold (RQLT[0:7])
The receive
queue low threshold for the connection, in
increments of 32 packets of 2048 bytes each. The value of this register is multiplied by 32 * 2048 bytes to
determine the byte location of the threshold. Note that the receive queue is for data that was received from the
Ethernet Interface to be sent to the Serial Interface.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
SU.RQHT
Receive Queue High Threshold (Watermark)
15Bh
7
6
5
4
3
2
1
0
RQHT7
0
RQHT6
0
RQHT5
1
RQHT4
1
RQHT3
1
RQHT2
0
RQHT1
1
RQHT0
0
Bits 0 – 7: Receive Queue High Threshold (RQTH[0:7])
The receive
queue high threshold for the connection, in
increments of 32 packets of 2048 bytes each. The value of this register is multiplied by 32 * 2048 bytes to