8.2.290 GMAC Express MAC Screening Type 1 Register
Screening Type 1 registers are used to allocate up to 6 priority queues to received frames based on certain IP or UDP fields of incoming frames.
| Name: | GMAC_EMAC_ST1R |
| Offset: | 0x1500 |
| Reset: | 0x00000000 |
| Property: | Read/Write |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| UDPE | DSTCE | UDPM[15:12] | |||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| UDPM[11:4] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| UDPM[3:0] | DSTCM[7:4] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| DSTCM[3:0] | QNB[2:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | ||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
Bit 29 – UDPE UDP Port Match Enable
When UDP port match enable is set (bit 29), the UDP Destination Port of the received UDP frame is matched against bits 27:12.
Bit 28 – DSTCE Differentiated Services or Traffic Class Match Enable
When DS/TC match enable is set (bit 28), the DS (differentiated services) field of the received IPv4 header or TC field (traffic class) of IPv6 headers are matched against bits 11:4.
Bits 27:12 – UDPM[15:0] UDP Port Match
When UDP port match enable is set (bit 29), the UDP Destination Port of the received UDP frame is matched against bits 27:12.
Bits 11:4 – DSTCM[7:0] Differentiated Services or Traffic Class Match
When DS/TC match enable is set (bit 28), the DS (differentiated services) field of the received IPv4 header or TC field (traffic class) of IPv6 headers are matched against bits 11:4.
Bits 2:0 – QNB[2:0] Queue Number (0–5)
If a match is successful, then the queue value programmed in bits 2:0 is allocated to the frame.