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<Basic operation>
• Polling is performed starting from the second clock in the basic operation cycle.
• Inquires are made sequentially, starting from PHY address 0 (2nd, 4th, 6th, ... clock), and the result of the
inquiry is returned at the next clock (3rd, 5th, 7th ... clock).
• The result of polling all the PHY devices is passed to the switch circuit at the 27th clock.
• The PHY device that outputs a cell is selected at the 54th clock (if no PHY device has a cell to output, nothing
is selected).
46
CHAPTER 3 FUNCTIONAL OUTLINE
Figure 3-7. Polling Operation during Cell Output
2
3
UP0
27
Polling
circuit
Switch
circuit
54
: Number of clocks
0
PHY
1
PHY
2
4
3
PHY
5
.
.
.
11
24
PHY
25
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