IOBUS0 datasheet(44/88 Pages) FTDI

tên linh kiện	IOBUS0

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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

The command and status formats for this mode can be seen in Figure 6.7 below with a description of

each field in Table 6.6:

Command:

Status:

Figure 6.7 SPI Command and Status Structure

Field

Description

A2:A0

Address of slave being used in a multi-slave environment. This would typically be used in the

scenario where a shared data bus is used.

R/W#

Set to ‘1’ for a read and ‘0’ for a write.

Tri-stated.

TXE

Transmit Empty.

When ‘1’ the Slave transmit buffer has no new data to transmit.

When ‘0’ the Slave transmit buffer does have new data.

RXF

Receive Full.

When ‘1’ the Slave receive buffer has new data which has not been read yet.

When ‘0’ the Slave receive buffer is empty and can be safely written to.

ACK

Set to ‘1’ when a Slave has correctly decoded its address.

Table 6.6 SPI Command and Status Fields

R/W#

TXE

RXF

ACK

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