Sharp LH79524 - Network Configuration Register (NETCONFIG); Table 6-8. NETCONFIG Register; Table 6-9. NETCONFIG Fields

Ethernet MAC Controller LH79524/LH79525 User’s Guide
6-22 Version 1.0
6.3.2.2 Network Configuration Register (NETCONFIG)
This register allows general network configuration.
Table 6-8. NETCONFIG Register
BIT 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIELD ///
IGNORE
ENFRM
DISCARDFCS
LENGTHCHK
RESET 0000000000000000
TYPE RO RO RO RO RO RO RO RO RO RO RO RO RW RW RW RW
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIELD
RXBUFOS
PAUSEEN
RETRY
DIV ///
RECBYTE
UNIHASHEN
MULTIHASHEN
NOBCAST
CPYFRM
JUMBOFRM
BITRATE
FULLDUPLEX
///
RESET 0000100000000000
TYPE RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW
ADDR 0xFFFC7000 + 0x04
Table 6-9. NETCONFIG Fields
BITS NAME FUNCTION
31:20 /// Reserved Reading returns 0. Write the reset value.
19 IGNORE
Ignore RX FCS This bit causes frames with FCS/CRC errors to not be rejected
and no FCS error statistics to be counted. For normal operation, this bit must be
programmed to 0.
1 = Do not reject frames with FCS/CRC errors or count FCS errors
0 = Normal operation
18 ENFRM
Enable Frames Enable frames to be received in half-duplex mode while transmitting.
1 = Enable frame receipt in half-duplex mode while transmitting
0 = Disable frame receipt in half-duplex mode while transmitting
17 DISCARDFCS
Discard Receive FCS Specifies whether the FCS field of received frames will be
copied to memory.
1 = Do not copy FCS field to memory
0 = Copy FCS field to memory
16 LENGTHCHK
Receive Length Field Checking Enable Specifies whether frames with measured
lengths shorter than their length fields will be discarded. Frames containing a type ID
in bytes 13 and 14 (length/type ID = 0600) will not be counted as length errors.
1 = Discard frames with length shorter than length field
0 = Do not discard frames with length shorter than length field
15:14 RXBUFOS
Receive Buffer Offset Indicates the number of bytes by which the received data
is offset from the start of the first receive buffer.
13 PAUSEEN
Pause Enable Specifies if transmission will pause when a valid Pause frame is
received.
1 = Pause transmission if a valid Pause frame is received
0 = Do not pause on receipt of a Pause frame