CHAPTER 21:Ethernet MAC
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
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[bit6] transmit_under_run: Transmit under run
This bit is set if the transmitter was forced to terminate a frame that it had already began transmitting
due to further data being unavailable. This bit is set if a transmitter status write back has not completed
when another status write back is attempted. When using the DMA interface configured for internal
FIFO mode, this bit is also set when the transmit DMA has written the SOP data into the FIFO and
either the AHB bus was not granted in time for further data, or because an AHB not OK response was
returned, or because a used bit was read. When using the DMA interface configured for packet buffer
mode, this bit will never be set. When using the external FIFO interface, this bit is also set when the
tx_r_underflow input is asserted during a frame transfer. Cleared by writing a 1.
[bit5] transmit_complete: Transmit complete
This bit is set when a frame has been transmitted. Cleared by writing “1” to this bit.
[bit4] amba_error:
Transmit frame corruption due to AMBA (AXI) errors
Set if an error occurs whilst midway through reading transmit frame from system memory including
RRESP or BRESP errors and buffers exhausted mid frame (if the buffers run out during transmission of
a frame then transmission stops, FCS shall be bad and tx_er asserted). Also set in DMA packet buffer
mode if single frame is too large for configured packet buffer memory size. Cleared by writing “1” to this
bit.
[bit3] transmit_go: Transmit ongoing
While transmit is ongoing this bit reads as “1”. Writing has no effect.
[bit2] retry_limit_exceeded: Retry limit exceeded
Cleared by writing a one to this bit.
[bit1] collision_occurred: Collision occurred
Set by the assertion of collision. Cleared by writing a one to this bit. When operating in 10/100 mode,
this status indicates either a collision or a late collision. In gigabit mode, this status is not set for a late
collision..
[bit0] used_bit_read: Used bit read
Used bit read Set when a transmit buffer descriptor is read with its used bit set. Cleared by writing a
one to this bit.
Summary of Contents for S6J3200 Series
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