AX88780_07 ASIX [ASIX Electronics Corporation], AX88780_07 Datasheet - Page 52

• Manufacturer Part Number: AX88780_07
• Description: High-Performance Non-PCI Single-Chip 32-bit 10/100M Fast Ethernet Controller
• Manufacturer: ASIX [ASIX Electronics Corporation]

Appendix A3. Synchronous and asynchronous timing selection
A3-2. AX88780 is asynchronous to host MCU.
references to select clock frequency of host MCU and AX88780.
A3-1. AX88780 is synchronous with host MCU.
AX88780 can support synchronous or asynchronous access from host MCU. Below information provides some
The timing selection is suitable for both 32-bit and 16-bit mode.
The timing selection is suitable for both 32-bit and 16-bit mode.
Note: The reference clock is from OSC, and it’s not the output of host MCU. For instance, if AX88780 runs in
asynchronous mode and refers a 100MHz clock from OSC, whereas MCU runs in 125Mhz environment. In
such condition, MCU must at least offer 60ns (min 6 reference clock of 100Mhz) access timing to AX88780.
The 60ns for MCU is almost reached to 8 clocks (125MHz). We recommend that it is needed to extend the
access timing of MCU to AX88780.
Frequency
Max 100MHz
Frequency
Max 100MHz
Single or Burst
Single or Burst
Access type
Access type
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Valid access timing (OEN/WEN active timing)
Min 5 clocks
Valid access timing (OEN/WEN active timing)
Min 6 reference clocks (Note)
ASIX ELECTRONICS CORPORATION
AX88780