VNC2-32L1B-REEL Datasheet, PDF (44/88 Pages) List of Unclassifed Manufacturers – Future Technology Devices International Ltd

Datasheet
Vinculum-II Embedded Dual USB Host Controller IC
Version 1.5
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:
A2
A1
A0 R/W#
Z
Z
Z
Z
Status:
Z
Z
Z
Z
TXE
RXF
ACK
Z
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.
Z
Tri-stated.
Transmit Empty.
TXE
When „1‟ the Slave transmit buffer has no new data to transmit.
When „0‟ the Slave transmit buffer does 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 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
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