參數(shù)資料
型號: TMX320VC5421
廠商: Texas Instruments, Inc.
元件分類: 數(shù)字信號處理
英文描述: DIGITAL SIGNAL PROCESSOR
中文描述: 數(shù)字信號處理器
文件頁數(shù): 65/88頁
文件大?。?/td> 1156K
代理商: TMX320VC5421
TMS320VC5421
DIGITAL SIGNAL PROCESSOR
SPRS098 – DECEMBER 1999
65
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
reset, BIO, interrupt, and XIO timings
timing requirements for reset, BIO, interrupt, and XIO [H = 0.5 t
c(CO)
]
(see Figure 32, Figure 33,
and Figure 34)
MIN
MAX
UNIT
th(RS)
th(BIO)
th(INT)
th(XIO)
tw(RSL)
tw(BIO)A
tw(INTH)A
tw(INTL)A
tw(INTL)WKP
tsu(RS)
tsu(BIO)
tsu(INT)
tsu(XIO)
The external interrupts (INT0–INT1, NMI) are synchronized to the core CPU by way of a two flip-flop synchronizer which samples these inputs
with consecutive falling edges of CLKOUT. The input to the interrupt pins is required to represent a 1-0-0 sequence at the timing that is
corresponding to a three-CLKOUT sampling sequence.
If the PLL mode is selected, then at power-on sequence, or at wakeup from IDLE3, RS must be held low for at least 50
μ
s to ensure
synchronization and lock-in of the PLL.
§RS can cause a change in clock frequency, changing the value of H (see the software-programmable phase-locked loop (PLL) section).
Hold time, RS after CLKOUT low
0
ns
Hold time, BIO after CLKOUT low
Hold time, INTn, NMI, after CLKOUT low
0
ns
0
ns
Hold time, XIO after CLKOUT low
Pulse duration, RS low§
Pulse duration, BIO low, asynchronous
Pulse duration, INTn, NMI high (asynchronous)
Pulse duration, INTn, NMI low (asynchronous)
Pulse duration, INTn, NMI low for IDLE2/IDLE3 wakeup
Setup time, RS before CLKIN low§
0
ns
4H+5
ns
5H
ns
4H
ns
4H
ns
8
ns
5
ns
Setup time, BIO before CLKOUT low
9
12
ns
Setup time, INTn, NMI, RS before CLKOUT low
Setup time, XIO before CLKOUT low
9
13
ns
10
8
ns
BIO
CLKOUT
A_RS, B_RS,
INTn, NMI
CLKIN
th(BIO)
th(RS)
tsu(INT)
tw(BIO)A
tsu(BIO)
tw(RSL)
tsu(RS)
Figure 32. Reset and BIO Timings
A
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