Network Card User Manual

www.ti.com Ethernet Media Access Controller (EMAC) Registers
5.30 MAC Status Register (MACSTATUS)
The MAC status register (MACSTATUS) is shown in Figure 69 and described in Table 67.
Figure 69. MAC Status Register (MACSTATUS)
31 30 24 23 20 19 18 16
IDLE Reserved TXERRCODE Rsvd TXERRCH
R-0 R-0 R-0 R-0 R-0
15 12 11 10 8
RXERRCODE Reserved RXERRCH
R-0 R-0 R-0
7 3 2 1 0
Reserved RXQOSACT RXFLOWACT TXFLOWACT
R-0 R-0 R-0 R-0
LEGEND: R = Read only; R/W = Read/Write; -n = value after reset
Table 67. MAC Status Register (MACSTATUS) Field Descriptions
Bit Field Value Description
31 IDLE EMAC idle bit. This bit is set to 0 at reset; one clock after reset it goes to 1.
0 The EMAC is not idle.
1 The EMAC is in the idle state.
30-24 Reserved 0 Reserved
23-20 TXERRCODE 0-Fh Transmit host error code. These bits indicate that EMAC detected transmit DMA related host errors.
The host should read this field after a host error interrupt (HOSTPEND) to determine the error. Host
error interrupts require hardware reset in order to recover. A 0 packet length is an error, but it is not
detected.
0 No error
1h SOP error; the buffer is the first buffer in a packet, but the SOP bit is not set in software.
2h Ownership bit not set in SOP buffer
3h Zero next buffer descriptor pointer without EOP
4h Zero buffer pointer
5h Zero buffer length
6h Packet length error (sum of buffers is less than packet length)
19 Reserved 0 Reserved
18-16 TXERRCH 0-7h Transmit host error channel. These bits indicate which transmit channel the host error occurred on.
This field is cleared to 0 on a host read.
0 The host error occurred on transmit channel 0
1h The host error occurred on transmit channel 1
2h The host error occurred on transmit channel 2
3h The host error occurred on transmit channel 3
4h The host error occurred on transmit channel 4
5h The host error occurred on transmit channel 5
6h The host error occurred on transmit channel 6
7h The host error occurred on transmit channel 7
15-12 RXERRCODE 0-Fh Receive host error code. These bits indicate that EMAC detected receive DMA related host errors.
The host should read this field after a host error interrupt (HOSTPEND) to determine the error. Host
error interrupts require hardware reset in order to recover.
0 No error
2h Ownership bit not set in SOP buffer
4h Zero buffer pointer
11 Reserved 0 Reserved
111
SPRUFI5B–March 2009–Revised December 2010 Ethernet Media Access Controller (EMAC)/Management Data Input/Output
(MDIO)
Submit Documentation Feedback
© 2009–2010, Texas Instruments Incorporated