Datasheet
Vinculum-II Embedded Dual USB Host Controller IC
Version 1.7
Document No.: FT_000138 Clearance No.: FTDI#143
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:
A2
Z
A1
Z
A0
Z
R/W#
Z
Z
Z
Z
Z
Z
TXE
RXF
ACK
Figure 6.7 SPI Command and Status Structure
Field
Description
Address of slave being used in a multi-slave environment. This would typically be used in the
scenario where a shareddata busis used.
A2:A0
R/W#
Z
Set to ‘1’ for a read and ‘0’ for a write.
Tri-stated.
Transmit Empty.
TXE
When ‘1’ the Slave transmit bufferhas no new data to transmit.
When ‘0’ the Slave transmit bufferdoes have new data.
Receive Full.
RXF
When ‘1’ the Slave receive buffer has new data which has not been read yet.
When ‘0’ the Slave receive buffer is empty and canbe safely written to.
ACK
Set to ‘1’ when a Slave has correctly decodedits address.
Table 6.6 SPI Command and Status Fields
44
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