Altera POS-PHY Level 2 and 3 Compiler Instrukcja Użytkownika Pobierz pdf (Strona 42)

3–14 Chapter 3: Functional Description

Parameters

POS-PHY Level 2 and 3 Compiler User Guide © November 2009 Altera Corporation

Preliminary

For the Atlantic master sink, the dav signal is an input. The slave indicates to the

master that it has data by asserting dav. The master then tries to empty the slave FIFO

buffer. Figure 3–12 shows the behavior of the dav signal. FIFO buffer burst is not

applicable. FIFO buffer remote burst is not applicable.

For the Atlantic slave sink, the dav signal is an output. The dav signal high indicates

that there is space for more data. When the FIFO buffer is below full threshold, dav is

high. When the FIFO buffer is filling, dav remains high until the FIFO buffer reaches

burst threshold. When the FIFO buffer is emptying, dav remains low until the FIFO

buffer reaches full threshold. Figure 3–13 shows the behavior of the dav signal. FIFO

buffer remote burst is not applicable.

For the Atlantic slave source, the dav signal is an output. When dav is high, there is

data to send. When the FIFO buffer is above the empty threshold, dav is high. When

the FIFO buffer is filling, dav remains low until the FIFO buffer reaches empty

threshold. When the FIFO buffer is emptying, dav remains high until the FIFO buffer

reaches burst threshold. Figure 3–14 shows the behavior of the dav signal. FIFO

buffer remote burst is not applicable.

Figure 3–12. Behavior of the dav Signal as an Input to the Atlantic Master Sink (Note 1)

Note to Figure 3–12:

(1) The slave asserts dav high for two reasons: it has passed its threshold, or an EOP has occurred.

Figure 3–13. Behavior of the dav Signal—Atlantic Slave Sink

Figure 3–14. Behavior of the dav Signal—Atlantic Slave Source

lave has no dat

dav

lave has dat

dav

hol

Empt

hol

dav

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