DM9302
10/100Mbps Ethernet Fiber/Twisted Pair Media Converter with Local bus
6.21 Receive Check Sum Control Status Register (32H)
Bit
Name
Default
Description
7
UDPS
HP0,RO
UDP Checksum Status
1: UDP packet checksum is fail.
0: UDP packet checksum is OK or it is not a UDP packet.
6
5
TCPS
IPS
HP0,RO
HP0,RO
TCP Checksum Status
1: TCP packet checksum is fail.
0: TCP packet checksum is OK or it is not a TCP packet.
IP Checksum Status
1: IP packet checksum is ail
0: IP packet checksum is OK or it is not an IP packet.
4
3
2
1
UDPP
TCPP
IPP
HP0,RO
HP0,RO
HP0,RO
This is an UDP Packet
This is a TCP Packet
This is an IP Packet
RCSEN
HPS0,RW Receive Checksum Checking Enable
When set, the checksum status will store in packet first byte of status header.
HPS0,RW Discard Checksum Error Packet
When set, IP/TCP/UDP checksum field is error, this packet will be discarded.
0
DCSE
6.22 uP Data Bus driving capability Register (38H)
Bit
Name
Default
Description
RESERVED
0,RW
reserved
7
SD Bus Current Driving/Sinking Capability
00: 2mA
ISA_CURR
P01,RW 01: 4mA (default)
10: 6mA
6:5
11: 8mA
4:3
2
Reserved
STEP
P0,RW
P0,RW
Reserved
Data Bus Output stepping
1: disabled
0: enabled
Eliminate IOW spike
1: eliminate about 2ns IOW spike
Eliminate IOR spike
1: eliminate about 2ns IOR spike
1
0
IOW_SPIKE
IOR_SPIKE
P0,RW
P1,RW
6.23 IRQ Pin Control Register (39H)
Bit
Name
Default
Description
7:2
Reserved
PS0,RO
Reserved
IRQ Pin Output Type Control
1
0
IRQ_TYPE
IRQ_POL
PET0,RW 1: IRQ Open-Collector output
0: IRQ direct output
IRQ Pin Polarity Control
PET0,RW 1: IRQ active low
0: IRQ active high
Preliminarydatasheet
DM9302-15-DS-P01
July 30, 2009
21
DAVICOM [ DAVICOM SEMICONDUCTOR, INC. ]
