VNC2-48Q1B-REEL FTDI, VNC2-48Q1B-REEL Datasheet - Page 62

• Manufacturer Part Number: VNC2-48Q1B-REEL
• Description: USB Interface IC Vinculum-II Dual USB Host/Dev IC QFN-48
• Manufacturer: FTDI
• Type: USB Host/Device Controllerr

Specifications of VNC2-48Q1B-REEL

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Temperature Range: - 40 C to + 85 C
• Supply Current: 25 mA
• Operating Supply Voltage: 1.8 V, 3.3V
• Package / Case: QFN-48
• Description/function: USB Vinculum-II Dual Host/Dev IC QFN-48
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: VINCULUM2

Document No.: FT_000138
VINCULUM-II EMBEDDED DUAL USB HOST CONTROLLER IC Datasheet
1.2
Version -
143
Clearance No.: FTDI#
6.6.2 Read / Write Transaction Asynchronous FIFO Mode
When in Asynchronous FIFO interface mode, the timing of read and write operations on the FIFO
interface are shown in Figure 6-22 and Table 29.
In asynchronous mode an external device can control data transfer driving FIFO_WR# and FIFO_RD#
inputs. In contrast to synchronous mode, in asynchronous mode the 245 FIFO module generates the
output enable EN# signal. EN# signal is effectively the read signal RD#.
Current byte is available to be read when FIFO_RD# goes low. When FIFO_RD# goes high, FIFO_RXF#
output will also go high. It will only become low again when there is another byte to read.
When FIFO_WR# goes low FIFO_TXE# flag will always go high. FIFO_TXE# goes low again only when
there is still space for data to be written in to the module.
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