Spi Flash Boot; Figure 41: Spi Flash: Serial Output Timing; Figure 42: Spi Flash: Serial Input Timing - Siemens ERTEC 200P-2 Manual

5) Start GDMA job (in HW-triggered request mode)
6) Start timer with write access to TIMER_GATE_TRIG_CONTROL_REG (sets
tim_4(5)_clk_en and tim_4(5)_int_gate_trig bits)
Block transfer is repeated as follows:
5) Start GDMA job (in HW-triggered request mode)
Start timer with write access to TIMER_GATE_TRIG_CONTROL_REG (sets
6)
tim_4(5)_clk_en and tim_4(5)_int_gate_trig bits)

SPI Flash Boot

2.3.10.7.5
An SPI can also be used to boot I-TCM and D-TCM (256 KByte in total). This boot pro-
cess can involve acyclic communication data or application code for rapid execution (e.g.
for the digital IO of the ECO PN). To meet fast start-up requirements, booting must be
completed within ca. 100 - 150 msec. High-speed SPI flash is therefore required.Figure
41: SPI flash: serial output timing and Figure 42: SPI flash: serial input timing show the
timing for a 7-MHz SPI flash (in this case Winbond W25X10/20/40). Table 19: Timing
parameters for SPI flash (75 MHz) lists the critical timing parameters.
At a frequency of 25 MHz, booting 256 KByte takes ca. 85 msec.
Copyright © Siemens AG 2016. All rights reserved
Technical data subject to change

Figure 41: SPI flash: serial output timing

Figure 42: SPI flash: serial input timing

343 ERTEC 200P-2 Manual
Version 1.0