VNC1L-1A-TRAY FTDI, VNC1L-1A-TRAY Datasheet - Page 19

• Manufacturer Part Number: VNC1L-1A-TRAY
• Description: USB Interface IC USB Vinculum Host /Dev Ctrl IC LQFP-48
• Manufacturer: FTDI

Specifications of VNC1L-1A-TRAY

• Product Category: USB Interface IC
• Rohs: yes
• Operating Supply Voltage: 3.3 V
• Operating Supply Current: 25 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP-48
• Minimum Operating Temperature: - 40 C
• Factory Pack Quantity: 250

Figure 5.5 SPI Slave Mode Data Write
5.2.4 SPI Master Status Read Transaction
The VNC1L has a status byte which determines the state of the Receive and Transmit Buffers. The SPI
master must poll VNC1L and read the status byte.
The Start and Setup sequence is sent to VNC1L by the SPI master, see Figure 5.6. The VNC1L clocks out
its status byte on subsequent rising edge clock cycles from the SPI master. This is followed by a status
bit generated by VNC1L (also on the SDO) which will always be zero (indicating new data).
The meaning of the bits within the status byte sent by VNC1L during a Status Read operation is described
in Table 5.8.
The result of the Status Read transaction is only valid during the transaction itself.
Data read and data write transactions must still check the status bit during a Data Read or Data Write
cycle regardless of the result of a Status Read operation.
Table 5.8 SPI Status Read Byte – bit descriptions.
Bit
0
1
2
3
4
5
6
7
Description
RXF IRQEn
TXE IRQEn
RXF#
TXE#
-
-
-
-
Copyright © 2009 Future Technology Devices International Limited
Description
Receive Buffer Full
Transmit Buffer Empty
Receive Buffer Full Interrupt Enable
Transmit Buffer Empty Interrupt Enable
Vinculum VNC1L Embedded USB Host Controller IC Datasheet Version 2.02
Document Reference No.: FT_000030
Clearance No.: FTDI# 50
19