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P5040/P5020 Reference Design Board User Guide, Rev. 0
Freescale Semiconductor
23
Architecture
NOTE
The P5040/P5020RDB has default DIP-switch settings that can be manually
repositioned as per user selected configuration levels. Several RCW bits
only can be changed by DIP-switches.
3
PORESET: After Negation
1. P5040/P5020 begins the configuration process and starts loading reset
configuration.
2. Host debugger controls PORESET processor signal (which sets a chosen
configuration).
4
Configuration Input
Reset configuration inputs are sampled to determine the following:
• Configuration source: CFG_RCW_SRC[4...0]
• CFG_DBG_RST_DIS
• CFG_ENG_USE[3...0]
• CFG_PLL_CONFIG_SEL_B
• CFG_POR_AINIT
• CFG_RCW_SRC_SLEW
• CFG_TEST_PORT_DIS
• CFG_TEST_PORT_MUX_SEL
• CFG_XVDD_SEL
• DRAM Type Select (DDR3 or DDR3L): CFG_DRAM_TYPE
• General Purpose Input: CFG_GPINPUT[15...0]. Only two[1...0] are driven.
• NAND FLASH ECC Enable: CFG_ELBC_ECC
• Response Disable: CFG_RSP_DIS
• System Version Register: CFG_SVR[1...0]
5
Configuration Time
Time required varies according to configuration source and CLKIN frequency.
Table 12. PORESET Sequence
Step
Sequence Stage
Description