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Networking Silicon — GD82559ER
10.4.2.4 EEPROM Interface Timings
The 82559ER is designed to support a standard 64x16, or 256x16 serial EEPROM. Table 27
provides the timing parameters for the EEPROM interface signals. The timing parameters are
illustrated in Figure 30.
Figure 29. Flash Timings for a Read Cycle
FLADDR
FLCS#
FLOE#
FLDATA-R
Address Stable
Data In
T35
T37
T38 T39
T36
Table 27. EEPROM Timing Parameters
Symbol Parameter Min Max Units Notes
T50 t
EFSK
Serial Clock Frequency 1 Mhz
EEPROM fsk =
1 MHz
T51 t
ECSS
Delay from EECS High to EESK High 300 ns
EEPROM tcss
= 50 ns
T52 t
ECSH
Delay from EESK Low to EECS Low 30 ns
EEPROM tcsh
= 0 ns
T53 t
EDIS
Setup Time of EEDI to EESK 300 ns
EEPROM tdis
= 150 ns
T54 t
EDIH
Hold Time of EEDI after EESK 300 ns
EEPROM tdih
= 150 ms
T55 t
ECS
EECS Low Time 750 ns
EEPROM tcs =
250 ns