DP83907VF National Semiconductor, DP83907VF Datasheet - Page 16

• Manufacturer Part Number: DP83907VF
• Description: IC CONTROLLR AT/LANII TP 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83907VF

• Controller Type: Network Interface Controller (NIC)
• Interface: Twisted Pair
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 150mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-MQFP, 160-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP83907VF

4 0 Functional Description
A second DMA channel (Remote DMA) is used as a slave
DMA to transfer data between the local buffer memory and
the host system The Local DMA and Remote DMA are in-
ternally arbitrated with the Local DMA channel having high-
est priority Both DMA channels use a common external bus
clock to generate all required bus timing External arbitration
is performed with a standard bus request bus acknowledge
handshake protocol
4 9 TWISTED PAIR INTERFACE MODULE
The TPI consists of five main logical functions
a) The Receiver Smart Squelch responsible for determin-
ing when valid data is present on the differential receive
inputs (RXI
g
) and receiving the data
FIGURE 13 Twisted Pair Interface Module Block Diagram
(Continued)
16
b) The Collision function checks for simultaneous transmis-
c) The Link Detector Generator checks the integrity of the
d) The Jabber disables the transmitter if it attempts to
e) The TX Driver and Pre-emphasis transmits Manchester
sion and reception of data on the TXO
cable connecting the two twisted pair MAUs
transmit a longer than legal packet
encoded data to the twisted pair network via the sum-
ming resistors and transformer filter
g
and RXI
TL F 12082 – 8
g
pins