DS33Z41 Quad IMUX Ethernet Mapper
Register Name: |
| SU.RFSB0 |
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Register Description: |
| Receive Frame Status Byte 0 |
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Register Address: |
| 154h |
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Bit # | 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 | |
Name | FL7 | FL6 |
| FL5 | FL4 |
| FL3 | FL2 | FL1 | FL0 |
Default | 0 | 0 |
| 0 | 0 |
| 0 | 0 | 0 | 0 |
Bits 7 to 0: Frame Length (FL7 to FL0). These 8 bits are the low byte of the length (in bytes) of the received frame, with FCS and Padding. If Automatic Pad Stripping is enabled, this value is the length of the received packet without PCS or Pad bytes. The upper 6 bits are contained in SU.RFSB1.
Register Name: |
| SU.RFSB1 |
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Register Description: |
| Receive Frame Status Byte 1 |
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Register Address: |
| 155h |
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Bit # | 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 | |
Name | RF | WT |
| FL13 | FL12 |
| FL11 | FL10 | FL9 | FL8 |
Default | 0 | 0 |
| 0 | 0 |
| 0 | 0 | 0 | 0 |
Bit 7: Runt Frame (RF). This bit is set to 1 if the received frame was altered by a collision or terminated within the collision window.
Bit 6: Watchdog Timeout (WT). This bit is set to 1 if a packet receive time exceeds 2048 byte times. After 2048 byte times the receiver is disabled and the received frame will fail CRC check.
Bits 5 to 0: Frame Length (FL13 to FL8). These 6 bits are the upper bits of the length (in bytes) of the received frame, with FCS and Padding. If Automatic Pad Stripping is enabled, this value is the length of the received packet without PCS or Pad bytes.
Register Name: |
| SU.RFSB2 |
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Register Description: |
| Receive Frame Status Byte 2 |
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Register Address: |
| 156h |
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Bit # | 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 | |
Name | — | — |
| CRCE | DB |
| MIIE | FT | CS | FTL |
Default | 0 | 0 |
| 0 | 0 |
| 0 | 0 | 0 | 0 |
Bit 5: CRC Error (CRCE). This bit is set to 1 if the received frame does not contain a valid CRC value.
Bit 4: Dribbling Bit (DB). This bit is set to 1 if the received frame contains a
Bit 3: MII Error (MIIE). This bit is set to 1 if an error was found on the MII bus.
Bit 2: Frame Type (FT). This bit is set to 1 if the received frame exceeds 1536 bytes. It is equal to zero if the received frame is an 802.3 frame. This bit is not valid for runt frames.
Bit 1: Collision Seen (CS). This bit is set to 1 if a late collision occurred on the received packet. A late collision is one that occurs after the
Bit 0: Frame Too Long (FTL). This bit is set to 1 if a frame exceeds the 1518 byte maximum standard Ethernet frame. This bit is only an indication, and causes no frame truncation.
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