CHAPTER 21:Ethernet MAC
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S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
[bit12] retry_test: Retry test
Bit
Description
0
Normal operation.
1
Backoff between collisions will always be one slot time. Setting this bit to "1" helps test the "too many
retries" condition. Also used in the pause frame tests to reduce the pause counter's decrement time from
512 bit times, to every
RX_CLK
cycle.
[bit11] Reserved
Always read write value. Always write “0”.
[bit10:9] Reserved
Read always returns written value. Write always "0".
[bit8] receive_1536_byte_frames: Receive 1536 byte frames
Bit
Description
0
Ethernet MAC rejects frames above 1518 bytes in length.
1
Ethernet MAC accepts frames up to 1536 bytes in length.
[bit7] unicast_hash_enable: Unicast hash enable
Bit
Description
0
Unicast frames will not be accepted.
1
Unicast frames will be accepted when the 6-bit hash function of the destination address points to a bit
that is set in the Hash register
[bit6] multicast_hash_enable: Multicast hash enable
Bit
Description
0
Multicast frames will not be accepted.
1
Multicast frames will be accepted when the 6-bit hash function of the destination address points to a bit
that is set in the Hash register
[bit5] no_broadcast: No broadcast
Bit
Description
0
Frames addressed to the broadcast address of all ones will be accepted.
1
Frames addressed to the broadcast address of all ones will not be accepted.
[bit4] copy_all_frames: Copy all frames
Bit
Description
0
Only Unicast, Multicast, and Broadcast frames if enabled or frames which match Specific Address 1 to 4
are accepted.
1
All valid frames will be accepted.
[bit3] jumbo_frames: Jumbo frames
Bit
Description
0
Reject jumbo frames.
1
Accept jumbo frames up to 10240 bytes.
Содержание S6J3200 Series
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