IOBUS12 datasheet(62/88 Pages) FTDI

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Datasheet

Vinculum-II Embedded Dual USB Host Controller IC

V ers ion 1 .7

Doc ument N o.: FT _000138 C learance N o.: FT DI# 1 43

6.7.1 Read / Write Transaction Synchronous FIFO Mode

When in Synchronous FIFO interface mode, the timing of read and write operations on the FIFO interface

are shown in Figure 6.23 Synchronous FIFO mode Read / Write Cycle and Table 6.19

Synchronous FIFO mode Read / Write Timing

In synchronous mode data can be transmitted to and from the FIFO module on each clock edge. An

external device synchronises to the CLKOUT output and it also has access to the output enable OE# input

to control data flow. An external device should drive output enable OE# low before pulling RD# line

down.

When bursts of data are to be read from the module RD# should be kept low. RXF# remains low when

there is still data to be read. Similarly when bursts of data are to be written to the module WR# should

be kept low. TXE# remains low when there is still space available for the data to be written.

Figure 6.23 Synchronous FIFO mode Read / Write Cycle

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