参数资料
型号: SM320VC33HFGM150
厂商: TEXAS INSTRUMENTS INC
元件分类: 数字信号处理
英文描述: 32-BIT, 75 MHz, OTHER DSP, CQFP164
封装: NCTB, CERAMIC, MO-113AA, QFP-164
文件页数: 35/56页
文件大小: 669K
代理商: SM320VC33HFGM150
SM320VC33, SMJ320VC33
DIGITAL SIGNAL PROCESSOR
SGUS034E - FEBRUARY 2001 - REVISED OCTOBER 2002
40
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251-1443
interrupt response timing
The following table defines the timing parameters for the INTx signals.
timing requirements for INT3-INT0 response (see Figure 28)
MIN
NOM
MAX
UNIT
tsu(INT-H1L)
Setup time, INT3- INT0 before H1 low
4*
ns
th(H1L-INT)
Hold time, INT3- INT0 after H1 low
0
ns
tw(INT)
Pulse duration, interrupt to ensure only one interrupt
P + 5*
1.5P
2P - 5*
ns
* Not production tested
P = tc(H)
The interrupt (INTx) pins are synchronized inputs that can be asserted at any time during a clock cycle. The
TMS320C3x interrupts are selectable as level- or edge-sensitive. Interrupts are detected on the falling edge of
H1. Therefore, interrupts must be set up and held to the falling edge of the internal H1 for proper detection. The
CPU and DMA respond to detected interrupts on instruction-fetch boundaries only.
For the processor to recognize only one interrupt when level mode is selected, an interrupt pulse must be set
up and held such that a logic-low condition occurs for:
D A minimum of one H1 falling edge
D No more than two H1 falling edges
D Interrupt sources whose edges cannot be specified to meet the H1 falling edge setup and hold times must
be further restriced in pulse width as defined by tw(INT) (parameter 51) in the table above.
When EDGEMODE=1, the falling edge of the INT0-INT3 pins are detected using synchronous logic (see
Figure 7). The pulse low and high time should be two CPU clocks or greater.
The TMS320C3x can set the interrupt flag from the same source as quickly as two H1 clock cycles after it has
been cleared.
If the specified timings are met, the exact sequence shown in Figure 28 occurs; otherwise, an additional delay
of one clock cycle is possible.
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