MSC8154E Datasheet, PDF (46/68 Pages) Freescale Semiconductor, Inc – Quad-Core Digital Signal Processor with Security

Electrical Characteristics
2.6.3 TDM Timing
Table 31 provides the input and output AC timing specifications for the TDM interface.
Table 31. TDM AC Timing Specifications for 62.5 MHz¹
Parameter
Symbol²
Min
Max
Unit
TDMxRCK/TDMxTCK
t_DM
16.0
—
ns
TDMxRCK/TDMxTCK high pulse width
t_{DM_HIGH}
7.0
—
ns
TDMxRCK/TDMxTCK low pulse width
t_{DM_LOW}
7.0
—
ns
TDM all input setup time
t_DMIVKH
3.6
—
ns
TDMxRD hold time
t_DMRDIXKH
1.9
—
ns
TDMxTFS/TDMxRFS input hold time
t_DMFSIXKH
1.9
—
ns
TDMxTCK High to TDMxTD output active
t_{DM_OUTAC}
2.5
—
ns
TDMxTCK High to TDMxTD output valid
t_DMTKHOV
—
9.8
ns
TDMxTD hold time
t_DMTKHOX
2.5
—
ns
TDMxTCK High to TDMxTD output high impedance
t_{DM_OUTHI}
—
9.8
ns
TDMxTFS/TDMxRFS output valid
t_DMFSKHOV
—
9.25
ns
TDMxTFS/TDMxRFS output hold time
t_DMFSKHOX
2.0
—
ns
Notes: 1. The symbols used for timing specifications follow the pattern t_{(first two letters of functional block)(signal)(state)(reference)(state)} for inputs
and t_{(first two letters of functional block)(reference)(state)(signal)(state)} for outputs. For example, t_HIKHOX symbolizes the output internal
timing (HI) for the time t_serial memory clock reference (K) goes from the high state (H) until outputs (O) are invalid (X).
2. Output values are based on 30 pF capacitive load.
3. Inputs are referenced to the sampling that the TDM is programmed to use. Outputs are referenced to the programming edge
they are programmed to use. Use of the rising edge or falling edge as a reference is programmable. T_DMxTCK and T_DMxRCK are
shown using the rising edge.
4. All values are based on a maximum TDM interface frequency of 62.5 MHz.
Figure 20 shows the TDM receive signal timing.
TDMxRCK
t_DMIVKH
TDMxRD
t_DMIVKH
TDMxRFS
TDMxRFS (output)
t_DM
t_{DM_HIGH}
t_{DM_LOW}
t_DMRDIXKH
t_DMFSIXKH
t_DMFSKHOV
Figure 20. TDM Receive Signals
t_DMFSKHOX
MSC8154E Quad-Core Digital Signal Processor with Security Data Sheet, Rev. 0
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Freescale Semiconductor