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Rabbit 6000 User’s Manual
digi.com
286
The receiver can receive frames independent of the address (promiscuous mode), or it can receive
frames with a physical address match, a broadcast address match, or a multicast address match.
Normal DMA transfers of data begin once an address match occurs, and continue until the end-
frame delimiter is recognized or the line goes idle because of a collision. The network receiver
calculates the CRC across the entire frame in parallel with character assembly, and reports the
result when the end-frame delimiter is recognized. Normally frames with bad CRC are discarded.
The receiver also reports misaligned end-frame delimiters (those that do not occur on byte bound-
aries).
The network port implements the NLP receive link integrity test state machine, which requires
link integrity pulses to be detected at certain intervals in the absence of other network activity. If
the network receiver enters the NLP Link Test Fail state because of missing link-test pulses, this
state machine requires seven successive properly timed link test pulses (or an equal number of
FLP bursts) before reporting that the link is again active. The reset state of this state machine is
link-inactive. Note that this is a subtle difference relative to the normal 10Base-T receive link-
integrity state machine, which requires either link test pulses or carrier sense to make the link
active.
The network port implements the auto-negotiation algorithm to determine half-duplex or full-
duplex operation. In addition to its normal automatic operation, this feature can be disabled or
commanded to execute under software control.
There is a dedicated 2.5 V regulator in the Rabbit 6000 to power the Ethernet PHY. Several pins
come off the chip to allow for bypass capacitors. The regulator is disabled if Network Port B is
disabled.
The I/O interface consists of differential pair circuits for transmit and receive and four LED out-
puts for link, TX, RX, and speed status.
Summary of Contents for 6000
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