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80221 bảng dữ liệu(PDF) 31 Page - LSI Computer Systems

tên linh kiện 80221
Giải thích chi tiết về linh kiện  100BASE-TX/10BASE-T Ethernet Media Interface Adapter
PDF  91 Pages
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nhà sản xuất  LSI [LSI Computer Systems]
Trang chủ  http://www.lsicsi.com
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80221 bảng dữ liệu(HTML) 31 Page - LSI Computer Systems

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80220/80221
4-31
MD400159/E
31
INTERNAL
INTERRUPT
MDC
MDIO
MDIO HI-Z
PULLED HIGH EXTERNALLY
MDIO HI-Z
PULLED HIGH EXTERNALLY
INTERRUPT
PULSE
INTERNAL
INTERRUPT
MDC
MDIO
LAST TWO BITS
OF READ CYCLE
MDIO HI-Z
PULLED HIGH EXTERNALLY
INTERRUPT
PULSE
MDIO HI-Z
PULLED HIGH EXTERNALLY
B0
B1
Figure 10. MDIO Interrupt Pulse
this bit is set, an interrupt is signalled by an low going pulse
on MDIO when MDC is high and the serial port is in the idle
state, as shown in the timing diagram in Figure 10. Once
MDIO is forced low to indicate the interrupt condition,
MDIO stays low until MDC returns low. Once MDC returns
a.) Interrupt Happens During Idle.
b.) Interrupt Happens During Read Cycle.
low, then MDIO goes back to high impedance state. If the
interrupt occurs while the serial port is being accessed,
then the MDIO interrupt pulse is delayed until one clock bit
after the serial port access cycle is ended as shown in
Figure 10.



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