參數(shù)資料
型號: FT2232HQ-TRAY
廠商: Future Technology Devices International Ltd
元件分類: 總線控制器
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQCC64
封裝: LEAD FREE, QFN-64
文件頁數(shù): 32/63頁
文件大?。?/td> 1598K
代理商: FT2232HQ-TRAY
Copyright 2010 Future Technology Devices International Limited
38
Document No.: FT_000061
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 2.10
Clearance No.: FTDI#77
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#
A0
RD#
WR#
1
X
0
Read Data Pipe
Write Data Pipe
0
1
Read Status
Send Immediate
Table 4.7 CPU-Style FIFO Interface Operation Select
The Status read is shown in Table 4.8
Data Bit
Data
Status
bit 0
1
Data available (=RXF)
bit 1
1
Space available (=TXE)
bit 2
1
Suspend
bit 3
1
Configured
bit 4
X
bit 5
X
bit 6
X
bit 7
X
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.
CS#
WR#
RD#
A0
Valid
t3
t1
t2
t4
t5
t6
t7
D7..0
Figure 4.17 CPU-Style FIFO Interface Operation Signal Waveforms.
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