C6416 datasheet(79/134 Pages) TI1

79 / 134 page

SMJ320C6414, SMJ320C6415, SMJ320C6416

FIXEDPOINT DIGITAL SIGNAL PROCESSORS

SGUS050A − JANUARY 2004 − REVISED MARCH 2004

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

PARAMETER MEASUREMENT INFORMATION (CONTINUED)

timing parameters and board routing analysis

The timing parameter values specified in this data sheet do not include delays by board routings. As a good

board design practice, such delays must always be taken into account. Timing values may be adjusted by

increasing/decreasing such delays. TI recommends utilizing 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 34 and Figure 15).

Figure 15 represents a general transfer between the DSP and an external device. The figure also represents

board route delays and how they are perceived by the DSP and the external device.

Table 34. Board-Level Timings Example (see Figure 15)

NO.

DESCRIPTION

Clock route delay

Minimum DSP hold time

Minimum DSP setup time

External device hold time requirement

External device setup time requirement

Control signal route delay

External device hold time

External device access time

DSP hold time requirement

DSP setup time requirement

Data route delay

ECLKOUTx

(Output from DSP)

ECLKOUTx

(Input to External Device)

Control Signals†

(Output from DSP)

Control Signals

(Input to External Device)

Data Signals‡

(Output from External Device)

Data Signals‡

(Input to DSP)

† Control signals include data for Writes.

‡ Data signals are generated during Reads from an external device.

Figure 15. Board-Level Input/Output Timings

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