DP83916VF National Semiconductor, DP83916VF Datasheet - Page 61

• Manufacturer Part Number: DP83916VF
• Description: IC CTRLR ORIENT NETWK IN 132PQFP
• Manufacturer: National Semiconductor
• Series: SONIC™r

Specifications of DP83916VF

• Controller Type: Network Interface Controller (NIC)
• Interface: Bus
• Mounting Type: Surface Mount
• Package / Case: 132-MQFP, 132-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Voltage - Supply: -
• Operating Temperature: -
• Other names: *DP83916VF

5 0 Bus Interface
5 4 5 5 Memory Cycle for BMODE
Mode
On the rising edge of T1 the SONIC-16 asserts ADS and
ECS to indicate that the memory cycle is starting The ad-
dress (A23–A1) bus status (S2–S0) and the direction
strobe (MWR) are driven and do not change for the remain-
der of the memory cycle On the falling edge of T1 the
SONIC-16 deasserts ECS ADS is deasserted on the rising
edge of T2
FIGURE 5-16 Memory Read BMODE
FIGURE 5-17 Memory Read BMODE
(Continued)
e
0 Asynchronous
61
e
e
In Asynchronous mode RDYi is asynchronously sampled
on the falling edge of both T1 and T2 RDYi does not need
to be synchronized to the bus clock because the chip al-
ways resolves these signals to either a high or low state
Meeting the setup time for RDYi guarantees that the SON-
IC-16 will terminate the memory cycle 1
RDYi was sampled T2 states will be repeated until RDYi is
sampled properly in a low state (see note following)
0 Asynchronous (1 Wait-State)
0 Asynchronous (2 Wait-State)
TL F 11722 – 42
bus clocks after
TL F 11722– 43