TXC-06880BIOG Transwitch Corporation, TXC-06880BIOG Datasheet - Page 102

• Manufacturer Part Number: TXC-06880BIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-06880BIOG

• Operating Supply Voltage (typ): 1.8/3.3V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

400C RW
Envoy-CE2 Device
DATA SHEET
TXC-06880
1 0 2 o f 1 2 2
(hex)
Addr
RO
RW
RW
RO
Mode
9-0
11-10
15-12
16
17
18
19
23-20
31-24
Range
Bit
Port 0 Ethernet Status and Configuration Register Description
value after
0x37
0xF
1
0
0
0
0xA
Default
reset
-
Memory Maps and Bit Descriptions
HALF-DUPLEX REGISTER
Collision Window: This is a programmable field representing the slot
time or collision window during which collisions occur in properly
configured networks. Since the collision window starts at the beginning of
transmission, the preamble and SFD are included. Its default value of
0x37 (55d) corresponds to the count of frame bytes at the end of the
window.
Reserved
Retransmission Maximum: This is a programmable field specifying the
number of retransmission attempts following a collision before aborting
the frame due to excessive collisions. The Standard specifies the attempt
limit to be 0xF (15d).
Excessive Defer:
0 - Causes the Tx MAC to allow transmission of a packet that has been
excessively deferred
1 - Configures the Tx MAC to abort transmission of a packet that has
been excessively deferred
No Backoff:
0 - Causes the Tx MAC to follow the binary exponential backoff rule
1 - Configures the Tx MAC to immediately re-transmit following a collision
Backpressure No Backoff:
0 - Causes the Tx MAC to follow the binary exponential backoff rule
1 - Configures the Tx MAC to immediately re-transmit, following a
collision, during backpressure
Alternate Binary Exponential Backoff Enable:
0 - Causes the Tx MAC to follow the standard binary exponential backoff
rule
1 - Configures the Tx MAC to use the Alternate Binary Exponential
Backoff Truncation setting instead of the IEEE 802.3 standard tenth
collision. The Standard specifies that any collision after the tenth uses
“210 - 1” as the maximum backoff time
Alternate Binary Exponential Backoff Truncation: This field is used
when Alternate Binary Exponential Backoff Enable is set. The value
programmed is substituted for the Ethernet standard value of ten.
Reserved
Description
-
PRELIMINARY TXC-06880-MB, Ed. 4
February 2005