ST STM32F101 series Reference Manual

DocID13902 Rev 15 1018/1128
RM0008 Ethernet (ETH): media access control (MAC) with DMA controller
1064
Bits 5, 7, and 0 reflect the conditions discussed in Table 216.
• RDES1: Receive descriptor Word1
Bit 3 RE: Receive error
When set, this bit indicates that the RX_ERR signal is asserted while RX_DV is asserted
during frame reception.
Bit 2 DE: Dribble bit error
When set, this bit indicates that the received frame has a non-integer multiple of bytes (odd
nibbles). This bit is valid only in MII mode.
Bit 1 CE: CRC error
When set, this bit indicates that a cyclic redundancy check (CRC) error occurred on the
received frame. This field is valid only when the last descriptor (RDES0[8]) is set.
Bit 0 PCE: Payload checksum error
When set, it indicates that the TCP, UDP or ICMP checksum the core calculated does not
match the received encapsulated TCP, UDP or ICMP segment’s Checksum field. This bit is
also set when the received number of payload bytes does not match the value indicated in
the Length field of the encapsulated IPv4 or IPv6 datagram in the received Ethernet frame.
Table 216. Receive descriptor 0
Bit 5:
frame
type
Bit 7: IPC
checksum
error
Bit 0: payload
checksum
error
Frame status
00 0
IEEE 802.3 Type frame (Length field value is less than
0x0600.)
1 0 0 IPv4/IPv6 Type frame, no checksum error detected
10 1
IPv4/IPv6 Type frame with a payload checksum error (as described
for PCE) detected
11 0
IPv4/IPv6 Type frame with an IP header checksum error (as
described for IPC CE) detected
11 1
IPv4/IPv6 Type frame with both IP header and payload checksum
errors detected
00 1
IPv4/IPv6 Type frame with no IP header checksum error and the
payload check bypassed, due to an unsupported payload
01 1
A Type frame that is neither IPv4 or IPv6 (the checksum offload
engine bypasses checksum completely.)
0 1 0 Reserved
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
DIC
RBS2 RBS2
RER
RCH
Reserved
RBS
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw

ST STM32F101 series Specifications

General

Brand	ST
Model	STM32F101 series
Category	Computer Hardware
Language	English