參數(shù)資料
型號(hào): USS820D-DB
英文描述: USS-820D USB Device Controller
中文描述: 號(hào)- 820D USB設(shè)備控制器
文件頁(yè)數(shù): 41/58頁(yè)
文件大?。?/td> 868K
代理商: USS820D-DB
Agere Systems Inc.
41
Data Sheet, Rev. 4
June 2001
USB Device Controller
USS-820D
Interrupts
Figure 8 describes the device interrupt logic. Each of the indicated USB events are logged in a status register bit.
Each status bit has a corresponding enable bit that allows the event to cause an interrupt. Interrupts can be
masked globally by the T_IRQ bit of the SCR register. The active level and signaling mode (level vs. pulse) of the
IRQN output pin can be controlled by the IRQPOL and IRQLVL bits of the SCR register. All interrupts have equal
priority—firmware establishes its own priority by the order in which it checks these status bits during interrupt
processing.
5-6402
Figure 8. USS-820D Interrupts
USB RESET
USB SUSPEND
IE_SUSP
SUSPEND
USB RESUME
IE_RESUME
RESUME
USB START OF FRAME
PSEUDO START OF FRAME
ENDPOINT 7 RECEIVE COMPLETE
SBIE1[7]
SBI1[7]
ENDPOINT 0 RECEIVE COMPLETE
SBIE[1]
SBI[1]
ENDPOINT 7 TRANSMIT COMPLETE
SBIE1[6]
SBI1[6]
ENDPOINT 0 TRANSMIT COMPLETE
SBIE[0]
SBI[0]
IE_RESET
RESET
SOFIE
ASOF
T_IRQ
INTERRUPT
PRESENT
RISING EDGE
DETECT
&
PULSE
GENERATE
IRQLVL
I
O
IRQN PIN
IRQPOL
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