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ADM5120
Register Description
Bits
Type Name
Initial value
Description
31:28 RW Req_lat
AHB request latency = the AHB bus request latency,
4: 4 clocks latency between requests
4.4.10 CPUp_conf, offset 0x24
Bits
Type Name
Description
Initial value
0
RW
DisCPUport
Disable CPU port = 1: disable the switch CPU port, and
so send packets to CPU and clear all the packets in the
switch buffer
1
1
RW
CRC_padding
CRC padding from CPU = 1: the packet from CPU with
CRC
0
2 RW
bridge
mode bridge
testing
mode:
0: default
1: forward to CPU, if the DA is the port, belonged to the
other VLAN (for the bridge mode testing)
0
8:3
Reserved
Not
Applicable
14:9 RW
DisUN_port
Disable unknown packets, from port(s), forward to CPU
→
1: no send unknown packet from the port0 to port5
to CPU
15 Reserved
Not Applicable
21:16 RW
DisMC_port
Disable multicast packets, from port(s), forward to CPU
→
1: no send MC from the port0 to port5 to CPU
23:17
Reserved
Not
Applicable
29:24 RW
DisBC_port
Disable broadcast packets, from port(s), forward to CPU
→
1: no send BC from the port0 to port5 to CPU
31:30 RW Reserved
Not
Applicable
4.4.11 Port_conf0, offset 0x28
Bits
Type Name
Description
Initial value
5:0 RW Dis_port
Disable
port
→
1: port disable (if dumb mode, default
= 0)
7:6
Reserved
Not
Applicable
13:8 RW
En_MC
enable all MC packet broadcast to port in the same
VLAN (
not including CPU
)
→
1: enable Layer2 MC
broadcast to ports, 0: do not broadcast MC
15:14
Reserved
Not
Applicable
21:16 RW
En_BP
Enable back pressure
→
1: enable back pressure (but
need qualify BP_mode)
ADMtek Inc.
4-10