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參數資料
型號: ISD-300A1
英文描述: Universal Serial Bus
中文描述: 通用串行總線
文件頁數: 54/67頁
文件大小: 580K
代理商: ISD-300A1
ISD-300A1
49
October 19, 2001
SYS_IRQ Interface Timing
The timing specifications for SYS_IRQ relative to the USB interrupt pipe data are given below.
T
HD:IRQ
T
SU:DAT
SYS_IRQ
INPUT PIN
T
HD:DATA
Figure 7 – SYS_IRQ Interface Timing
SYS_IRQ Parameter
Interrupt pipe data set up time
SYS_IRQ hold time
Interrupt pipe data hold time
Symbol
T
SU:DAT
T
HD:IRQ
T
HD:DATA
Value
0 ns
150 ns
150 ns
Table 28 – SYS_IRQ Interface Timing
ATA/ATAPI Port Timing Characteristics
All input signals on the ATA/ATAPI port are considered asynchronous, and are synchronized to the chip’s
internal system clock. All output signals are clocked using the chip’s internal system clock, for which there
is no external reference. Thus, the output signals should be considered asynchronous. The PIO mode used
for data register accesses is retrieved from the device or specified in the ISD-300A1 configuration bytes.
Clock
Crystal
KDS AT-49 crystal, 10pf load capacitance.
Note: Clock signal frequency is measured at V
DD33
/2 point. Rise and fall times should be 2 ns or less.
Frequency
30 MHz ± 0.005%
Duty Cycle
n/a
Table 29 – Clock Requirements
Reset
The ISD-300A1 requires an off-chip power-on reset circuit. NRESET must be held asserted for a
minimum of 1 ms after power is stable.
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