SGUS033A February 2002 – May 2016 SMJ320C6203
PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
All input and output timing parameters are referenced to 1.5 V for both 0 and 1 logic levels.
All rise and fall transition timing parameters are referenced to VIL MAX and VIH MIN for input clocks, and VOL MAX and VOH MIN for output clocks.
The timing parameter values specified in this data sheet do not include delays by board routings. As a good board design practice, always account for such delays. Timing values may be adjusted by increasing/decreasing such delays. TI recommends using the available I/O buffer information specification (IBIS) models to analyze the timing characteristics correctly. If needed, external logic hardware such as buffers may be used to compensate any timing differences.
For inputs, timing is most impacted by the round-trip propagation delay from the DSP to the external device and from the external device to the DSP. This round-trip delay tends to negatively impact the input setup time margin, but also tends to improve the input hold time margins (see Table 1 and Figure 4).
Figure 4 represents a general transfer between the DSP and an external device. Figure 4 also represents board route delays and how they are perceived by the DSP and the external device.
NO. | DESCRIPTION |
---|---|
1 | Clock route delay |
2 | Minimum DSP hold time |
3 | Minimum DSP setup time |
4 | External device hold time requirement |
5 | External device setup time requirement |
6 | Control signal route delay |
7 | External device hold time |
8 | External device access time |
9 | DSP hold time requirement |
10 | DSP setup time requirement |
11 | Data route delay |