FT122 Datasheet, PDF (23/47 Pages) Future Technology Devices International Ltd. – FT122 ENHANCED USB DEVICE CONTROLLER WITH PARALLEL BUS IC Datasheet Version 1.1

Document No.: FT_000647
FT122 ENHANCED USB DEVICE CONTROLLER WITH PARALLEL
BUS IC Datasheet Version 1.1
Clearance No.: FTDI# 313
6.3 Data Flow Commands
6.3.1 Read Interrupt Register
Command
Data
: F4h
: Read 1 or 2 bytes (Default Mode); Read 1-4 bytes (Enhanced Mode)
Bit
Symbol
0 Endpoint 0 Out
1 Endpoint 0 In
2 Endpoint 1 Out
3 Endpoint 1 In
4 Endpoint 2 Out
5 Endpoint 2 In
6 Bus Reset
7 Suspend Change
Reset
0
0
0
0
0
0
0
0
Table 6-10 Interrupt Register Byte 1
Description
Interrupt for endpoint 0 OUT buffer. Cleared by Read
Last Transaction Status command.
Interrupt for endpoint 0 IN buffer. Cleared by Read Last
Transaction Status command.
Interrupt for endpoint 1 OUT buffer. Cleared by Read
Last Transaction Status command.
Interrupt for endpoint 1 IN buffer. Cleared by Read Last
Transaction Status command.
Interrupt for endpoint 2 OUT buffer. Cleared by Read
Last Transaction Status command.
Interrupt for endpoint 2 IN buffer. Cleared by Read Last
Transaction Status command.
Interrupt for bus reset. This bit will be cleared after
reading.
Interrupt for USB bus suspend status change. This bit
will be set to ‘1’ when FT122 goes to suspend (missing 3
continuous SOFs) or resumes from suspend. This bit will
be cleared after reading.
Bit
Symbol
Reset
Description
0 DMA EOT
0
Interrupt for end of DMA transfer. This bit will be cleared
after reading.
7-1 Reserved
0b’xxxxxxx Reserved
Table 6-11 Interrupt Register Byte 2
Bit
Symbol
Reset
Description
0 Endpoint 3 Out
0
Interrupt for endpoint 3 OUT buffer. Cleared by Read
Last Transaction Status command.
1 Endpoint 3 In
0
Interrupt for endpoint 3 IN buffer. Cleared by Read Last
Transaction Status command.
2 Endpoint 4 Out
0
Interrupt for endpoint 4 OUT buffer. Cleared by Read
Last Transaction Status command.
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