Datasheet
ENC424J600/624J600
DS39935C-page 92 2010 Microchip Technology Inc.
REGISTER 9-2: ETXSTAT: ETHERNET TRANSMIT STATUS REGISTER
U-0 U-0 U-0 R-0 R-0 R-0 R-0 R-0
— — — r rLATECOL
(1)
MAXCOL
(1)
EXDEFER
(1)
bit 15 bit 8
R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0
DEFER
(1)
r r CRCBAD COLCNT3
(1)
COLCNT2
(1)
COLCNT1
(1)
COLCNT0
(1)
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-13
Unimplemented: Read as ‘0’
bit 12-11
Reserved: Ignore on read
bit 10
LATECOL: Transmit Late Collision Status bit
(1)
1 = A collision occurred after transmitting more than MACLCONH + 8 bytes. The last transmission was
aborted.
0 = No late collision occurred during the last transmission
bit 9
MAXCOL: Transmit Maximum Collisions Status bit
(1)
1 = MACLCONL + 1 collisions occurred while transmitting the last packet. The last transmission was
aborted.
0 = MACLCONL or less collisions occurred while transmitting the last packet
bit 8
EXDEFER: Transmit Excessive Defer Status bit
(1)
1 = The medium was busy with traffic from other nodes for more than 24,288 bit times. The last
transmission was aborted.
0 = The MAC deferred for less than 24,288 bit times while transmitting the last packet
bit 7
DEFER: Transmit Defer Status bit
(1)
1 = The medium was busy with traffic from other nodes, so the MAC was forced to temporarily defer
transmission of the last packet
0 = No transmit deferral or an excessive deferral occurred while attempting to transmit the last packet
bit 6-5
Reserved: Ignore on read
bit 4
CRCBAD: Transmit CRC Incorrect Status bit
1 = The FCS field of the last packet transmitted did not match the CRC internally generated by the
MAC during transmission
0 = The FCS field of the last packet transmitted was correct or the MAC is configured to append an
internally generated CRC
bit 3-0
COLCNT<3:0>: Transmit Collision Count Status bits
(1)
Number of collisions that occurred while transmitting the last packet.
Note 1: Applicable in Half-Duplex mode only; collisions and deferrals are not possible in Full-Duplex mode.