SPRS902K October 2014 – February 2024 TMS320F28075 , TMS320F28075-Q1 , TMS320F28076
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
MIN | MAX | UNIT | ||
---|---|---|---|---|
Mode 0 | ||||
tc(SDC)M0 | Cycle time, SDx_Cy | 40 | 256 * SYSCLK period | ns |
tw(SDCH)M0 | Pulse duration, SDx_Cy high | 10 | tc(SDC)M0 – 10 | ns |
tsu(SDDV-SDCH)M0 | Setup time, SDx_Dy valid before SDx_Cy goes high | 5 | ns | |
th(SDCH-SDD)M0 | Hold time, SDx_Dy wait after SDx_Cy goes high | 5 | ns | |
Mode 1 | ||||
tc(SDC)M1 | Cycle time, SDx_Cy | 80 | 256 * SYSCLK period | ns |
tw(SDCH)M1 | Pulse duration, SDx_Cy high | 10 | tc(SDC)M1 – 10 | ns |
tsu(SDDV-SDCL)M1 | Setup time, SDx_Dy valid before SDx_Cy goes low | 5 | ns | |
tsu(SDDV-SDCH)M1 | Setup time, SDx_Dy valid before SDx_Cy goes high | 5 | ns | |
th(SDCL-SDD)M1 | Hold time, SDx_Dy wait after SDx_Cy goes low | 5 | ns | |
th(SDCH-SDD)M1 | Hold time, SDx_Dy wait after SDx_Cy goes high | 5 | ns | |
Mode 2 | ||||
tc(SDD)M2 | Cycle time, SDx_Dy | 8 * tc(SYSCLK) | 20 * tc(SYSCLK) | ns |
tw(SDDH)M2 | Pulse duration, SDx_Dy high | 10 | ns | |
tw(SDD_LONG_KEEPOUT)M2 | SDx_Dy long pulse duration keepout, where the long pulse must not fall within the MIN or MAX values listed. Long pulse is defined as the high or low pulse which is the full width of the Manchester bit-clock period. This requirement must be satisfied for any integer between 8 and 20. | (N * tc(SYSCLK)) – 0.5 | (N * tc(SYSCLK)) + 0.5 | ns |
tw(SDD_SHORT)M2 | SDx_Dy Short pulse duration for a high or low pulse (SDD_SHORT_H or SDD_SHORT_L). Short pulse is defined as the high or low pulse which is half the width of the Manchester bit-clock period. | tw(SDD_LONG) / 2 – tc(SYSCLK) | tw(SDD_LONG) / 2 + tc(SYSCLK) | ns |
tw(SDD_LONG_DUTY)M2 | SDx_Dy Long pulse variation (SDD_LONG_H – SDD_LONG_L) | – tc(SYSCLK) | tc(SYSCLK) | ns |
tw(SDD_SHORT_DUTY)M2 | SDx_Dy Short pulse variation (SDD_SHORT_H – SDD_SHORT_L) | – tc(SYSCLK) | tc(SYSCLK) | ns |
Mode 3 | ||||
tc(SDC)M3 | Cycle time, SDx_Cy | 40 | 256 * SYSCLK period | ns |
tw(SDCH)M3 | Pulse duration, SDx_Cy high | 10 | tc(SDC)M3 – 5 | ns |
tsu(SDDV-SDCH)M3 | Setup time, SDx_Dy valid before SDx_Cy goes high | 5 | ns | |
th(SDCH-SDD)M3 | Hold time, SDx_Dy wait after SDx_Cy goes high | 5 | ns |
The SDFM clock inputs (SDx_Cy pins) directly clock the SDFM module when there is no GPIO input synchronization. Any glitches or ringing noise on these inputs can corrupt the SDFM module operation. Special precautions should be taken on these signals to ensure a clean and noise-free signal that meets SDFM timing requirements. Precautions such as series termination for ringing due to any impedance mismatch of the clock driver and spacing of traces from other noisy signals are recommended.
See the "SDFM: Manchester Mode (Mode 2) Does Not Produce Correct Filter Results Under Several Conditions" advisory in the TMS320F2807x Real-Time MCUs Silicon Errata.