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RM0008
29.8.2
MMC register description
Ethernet MMC control register (ETH_MMCCR)
Address offset: 0x0100
Reset value: 0x0000 0000
The Ethernet MMC Control register establishes the operating mode of the management
counters.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
Bits 31:4 Reserved
Bit 3 MCF: MMC counter freeze
When set, this bit freezes all the MMC counters to their current value. (None of the MMC
counters are updated due to any transmitted or received frame until this bit is cleared to 0. If
any MMC counter is read with the Reset on Read bit set, then that counter is also cleared in
this mode.)
Bit 2 ROR: Reset on read
When this bit is set, the MMC counters is reset to zero after read (self-clearing after reset). The
counters are cleared when the least significant byte lane (bits [7:0]) is read.
Bit 1 CSR: Counter stop rollover
When this bit is set, the counter does not roll over to zero after it reaches the maximum value.
Bit 0 CR: Counter reset
When it is set, all counters are reset. This bit is cleared automatically after 1 clock cycle.
Ethernet MMC receive interrupt register (ETH_MMCRIR)
Address offset: 0x0104
Reset value: 0x0000 0000
The Ethernet MMC receive interrupt register maintains the interrupts generated when
receive statistic counters reach half their maximum values. (MSB of the counter is set.) It is
a 32-bit wide register. An interrupt bit is cleared when the respective MMC counter that
caused the interrupt is read. The least significant byte lane (bits [7:0]) of the respective
counter must be read in order to clear the interrupt bit.
31 30 29 28 27 26 25 24 23 22 21 20 19 18
Reserved
Bits 31:18 Reserved
Bit 17 RGUFS: Received Good Unicast Frames Status
This bit is set when the received, good unicast frames, counter reaches half the maximum
value.
Ethernet (ETH): media access control (MAC) with DMA controller
Reserved
17
16 15 14 13 12 11 10
rc_r
Doc ID 13902 Rev 12
9
8
7
6
9
8
7
6
Reserved
rc_r rc_r
5
4
3
2
1
0
rw rw rw rw
5
4
3
2
1
0
Reserved
1019/1096
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