參數(shù)資料
型號: LQ80221
英文描述: LAN Transceiver
中文描述: 網(wǎng)絡收發(fā)器
文件頁數(shù): 31/91頁
文件大小: 907K
代理商: LQ80221
80220/80221
4-31
MD400159/E
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 s set, an nterrupt s signalled by an ow going pulse
on MDIO when MDC s high and the serial port s n the dle
state, as shown in the timing diagram in Figure 10. Once
MDIO is forced low to indicate the interrupt condition,
MDIO stays ow until MDC returns ow. 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 nterrupt pulse s delayed until one clock bit
after the serial port access cycle is ended as shown in
Figure 10.
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