MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 404

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

Fast Ethernet Controller (FEC)
If the DA is a group (multicast) address and flow control is disabled, then the microcontroller will
perform a group hash table lookup using the 64-entry hash table programmed in GAUR and
GALR. If a hash match occurs, the receiver accepts the frame.
If flow control is enabled, the microcontroller will do an exact address match check between the
DA and the designated PAUSE DA (01:80:C2:00:00:01). If the receive block determines that the
received frame is a valid PAUSE frame, then the frame will be rejected. Note the receiver will
detect a PAUSE frame with the DA field set to either the designated PAUSE DA or the unicast
physical address.
If the DA is the individual (unicast) address, the microcontroller performs an individual exact
match comparison between the DA and 48-bit physical address that the user programs in the PALR
and PAUR registers. If an exact match occurs, the frame is accepted; otherwise, the
microcontroller does an individual hash table lookup using the 64-entry hash table programmed in
registers, IAUR and IALR. In the case of an individual hash match, the frame is accepted. Again,
the receiver will accept or reject the frame based on PAUSE frame detection, shown in
Figure
19-27.
If neither a hash match (group or individual), nor an exact match (group or individual) occur, then
if promiscuous mode is enabled (RCR[PROM] = 1), then the frame will be accepted and the MISS
bit in the receive buffer descriptor is set; otherwise, the frame will be rejected.
Similarly, if the DA is a broadcast address, broadcast reject (RCR[BC_REJ]) is asserted, and
promiscuous mode is enabled, then the frame will be accepted and the MISS bit in the receive
buffer descriptor is set; otherwise, the frame will be rejected.
In general, when a frame is rejected, it is flushed from the FIFO.
MCF5235 Reference Manual, Rev. 2
19-40
Freescale Semiconductor