DP83907VF National Semiconductor, DP83907VF Datasheet - Page 55

• 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

6 0 Operation of DP83907
This is the type of cycle used to read from a data transfer port in 16-bit mode These accesses are entirely asynchronous with
the DP83907 responding when it decodes the correct address on SA0– 9 and an IORD If AEN is high the cycle will be ignored
CHRDY is deasserted if the DP83907 is not ready to respond and asserted when ready If it is ready immediately CHRDY is not
deasserted IO16 is generated when an address within the DP83907’s data transfer port is decoded to indicate to the system
that this is a 16-bit transfer If the IO16CON bit in Configuration Register B is low then it will be a straight decode of the SA0– 9
lines If that bit is high the IO16 output will be generated after IORD goes active to indicate that this is a 16-bit transfer and the
address should be even SA0 low The data will appear on SD0– 15
This is the type of cycle used to write to a data transfer port in 16-bit mode These accesses are entirely asynchronous with the
DP83907 responding when it decodes the correct address on SA0– 9 and an IOWR If AEN is high the cycle will be ignored
CHRDY is deasserted if the DP83907 is not ready to respond and asserted when ready If it is ready immediately CHRDY is not
deasserted IO16 is generated when an address within the DP83907’s data transfer port is decoded to indicate to the system
that this is a 16-bit transfer If the IO16CON bit in Configuration Register B is low then it will be a straight decode of the SA0– 9
lines If that bit is high the IO16 output will be generated after IOWR goes active to indicate that this is a 16-bit transfer and the
address should be even SA0 low The data will be taken from SD0 – 15
(Continued)
16-Bit I O Slave Write
16-Bit I O Slave Read
55
TL F 12082 – 38
TL F 12082 – 39