FT2232HQ-REEL FTDI, FT2232HQ-REEL Datasheet - Page 38

• Manufacturer Part Number: FT2232HQ-REEL
• Description: USB Interface IC USB HS to Dual UART/ FIFO/SPI/JTAG/I2C
• Manufacturer: FTDI

Specifications of FT2232HQ-REEL

• Mounting Style: SMD/SMT
• Package / Case: QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.9 CPU-style FIFO Interface Mode Description
CPU-style FIFO interface mode is designed to allow a CPU to interface to USB via the FT2232H. This mode
is enabled in the external EEPROM. The interface is achieved using a chip select bit (CS#) and address bit
(A0). When either Channel A or Channel B are in CPU-style Interface mode the IO signal lines are
configured as given in Table 3.10.
This mode uses a combination of CS# and A0 to determine the operation to be carried out. The following
truth-table, Table 4.7, gives the decode values for particular operations.
CS#
1
0
0
Table 4.7 CPU-Style FIFO Interface Operation Select
The Status read is shown in Table 4.8
Data Bit
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
Table 4.8 CPU-Style FIFO Interface Operation Read Status Description
Note that bits 7 to 4 can be arbitrary values and that X= not used.
The timing of reading and writing in this mode is shown in Figure 4.17 and Table 4.9.
Figure 4.17 CPU-Style FIFO Interface Operation Signal Waveforms.
D7..0
WR#
RD#
CS#
A0
Copyright © 2010 Future Technology Devices International Limited
A0
X
0
1
Data
1
1
1
1
X
X
X
X
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
t1
t2
Valid
t3
Valid
RD#
X
Read Data Pipe
Read Status
Status
Data available (=RXF)
Space available (=TXE)
Suspend
Configured
X
X
X
X
t4
t5
t6
t7
Document No.: FT_000061
Valid
Clearance No.: FTDI#77
Datasheet Version 2.10
WR#
X
Write Data Pipe
Send Immediate
Valid
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