DS33Z41 Maxim Integrated Products, DS33Z41 Datasheet - Page 125

• Manufacturer Part Number: DS33Z41
• Description: Network Controller & Processor ICs Quad Inverse-Multipl exing Ethernet Mappe
• Manufacturer: Maxim Integrated Products

Specifications of DS33Z41

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Bit 12: Late Collision Control (LCC). When set to 1, enables retransmission of a collided packet even after the
collision period. When this bit is clear, retransmission of late collisions is disabled.
Bit 10: Disable Retry (DRTY). When set to 1, the MAC makes only a single attempt to transmit each frame. If a
collision occurs, the MAC ignores the current frame and proceeds to the next frame. When this bit equals 0, the
MAC will retry collided packets 16 times before signaling a retry error.
Bit 8: Automatic Pad Stripping (ASTP). When set to 1, all incoming frames with less than 46 byte length are
automatically stripped of the pad characters and FCS.
Bits 7 and 6: Back-Off Limit (BOLMT1 and BOLMT0). These two bits allow the user to set the back-off limit
used for the maximum retransmission delay for collided packets. Default operation limits the maximum delay for
retransmission to a countdown of 10 bits from a random number generator. The user can reduce the maximum
number of counter bits as described in the table below. See IEEE 802.3 for details of the back-off algorithm.
Bit 5: Deferral Check (DC). When set to 1, the MAC will abort packet transmission if it has deferred for more
than 24,288 bit times. The deferral counter starts when the transmitter is ready to transmit a packet, but is
prevented from transmission because CRS is active. If the MAC begins transmission but a collision occurs after
the beginning of transmission, the deferral counter is reset again. If this bit is equal to zero, then the MAC will
defer indefinitely.
Bit 3: Transmitter Enable (TE). When set to 1, packet transmission is enabled. When equal to zero,
transmission is disabled.
Bit 2: Receiver Enable (RE). When set to 1, packet reception is enabled. When equal to zero, packets are not
received.
Bit 7
0
0
1
1
Bit 6
0
1
0
1
Random Number Generator
Bits Used
10
8
4
1
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