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CS493292-CL 数据表(PDF) 10 Page - Cirrus Logic |
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CS493292-CL 数据表(HTML) 10 Page - Cirrus Logic |
10 / 86 page CS49300 Family DSP 10 DS339PP4 1.8. Switching Characteristics — Motorola® Host Mode (TA = 25 °C; VA, VD[3:1] = 2.5 V ±5%; Inputs: Logic 0 = DGND, Logic 1 = VD, CL = 20 pF) Notes: 1. Certain timing parameters are normalized to the DSP clock, DCLKP, in nanoseconds. DCLKP = 1/DCLK. The DSP clock can be defined as follows: External CLKIN Mode: DCLK == CLKIN/4 before and during boot DCLK == CLKIN after boot Internal Clock Mode: DCLK == 10MHz before and during boot, i.e. DCLKP == 100ns DCLK == 65 MHz after boot, i.e. DCLKP == 15.4ns It should be noted that DCLK for the internal clock mode is application specific. The application code users guide should be checked to confirm DCLK for the particular application. 2. This specification is characterized but not production tested. A 470 ohm pull-up resistor was used for characterization to minimize the effects of external bus capacitance. 3. See Tmdd from Motorola Host Mode in Table 7 on page 45 Parameter Symbol Min Max Unit Address setup before CS and DS low Tmas 5- ns Address hold time after CS and DS low Tmah 5- ns Delay between DS then CS low or CS then DS low Tmcdr 0 ∞ ns Data valid after CS and RD low with R/W high (Note 3) Tmdd -21 ns CS and DS low for read (Note 1) Tmrpw DCLKP + 10 - ns Data hold time after CS or DS high after read Tmdhr 5- ns Data high-Z after CS or DS high low after read (Note 2) Tmdis -22 ns CS or DS high to CS and DS low for next read (Note 1) Tmrd 2*DCLKP + 10 - ns CS or DS high to CS and DS low for next write (Note 1) Tmrdtw 2*DCLKP + 10 - ns Delay between DS then CS low or CS then DS low Tmcdw 0 ∞ ns Data setup before CS or DS high Tmdsu 20 - ns CS and DS low for write (Note 1) Tmwpw DCLKP + 10 - ns R/W setup before CS AND DS low Tmrwsu 5- ns R/W hold time after CS or DS high Tmrwhld 5- ns Data hold after CS or DS high Tmdhw 5- ns CS or DS high to CS and DS low with R/W high for next read (Note 1) Tmwtrd 2*DCLKP + 10 - ns CS or DS high to CS and DS low for next write (Note 1) Tmwd 2*DCLKP + 10 - ns |
类似零件编号 - CS493292-CL |
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类似说明 - CS493292-CL |
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