LAN9221 Datasheet, PDF (128/151 Pages) SMSC Corporation – High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O

High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
Chapter 6 Timing Diagrams
6.1
Equivalent Test Load
Output timing specifications assume an equivalent test load as illustrated in Figure 6.1 below.
OUTPUT
Test load varies dependent on VDDVARIO:
VDDVARIO = 3.3V ± 300mV: 25pF
VDDVARIO = 2.5V ± 10%: 10pF
VDDVARIO=1.8V ± 10%: 10pF
6.2
Figure 6.1 Equivalent Test Load
Host Interface Timing
The LAN9221/LAN9221i supports the following host cycles:
Read Cycles:
„ PIO Reads (nCS or nRD controlled)
„ PIO Burst Reads (nCS or nRD controlled)
„ RX Data FIFO Direct PIO Reads (nCS or nRD controlled)
„ RX Data FIFO Direct PIO Burst Reads (nCS or nRD controlled)
Write Cycles:
„ PIO writes (nCS and nWR controlled)
„ TX Data FIFO direct PIO writes (nCS or nWR controlled)
All timing measurements were verified under the following conditions:
Note: The specified test load used for output timing is dependant on VDDVARIO.
Temperature: ................................................................................................................................ Note 6.1
Load Capacitance (VDDVARIO = 3.3V +/- 300mV):........................................................................ 25pF
Load Capacitance (VDDVARIO = 2.5V +/- 10%): ............................................................................ 10pF
Load Capacitance (VDDVARIO = 1.8V +/- 10%): ............................................................................ 10pF
Note 6.1 0^oC to +70^oC for commercial version, -40^oC to +85^oC for industrial version.
Revision 2.6 (12-04-08)
128
DATASHEET
SMSC LAN9221/LAN9221i