NXP Semiconductors MPC5566, Reference Manual

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Boot Assist Module (BAM)
MPC5566 Microcontroller Reference Manual, Rev. 2
16-10 Freescale Semiconductor
• Sets the EXTM bit that enables the EBI for external master operation
• Configures the EBI for external arbitration by setting the EARB bit.
• Configures the EBI signals BB, BG, BR for bus arbitration. Refer to Table 16-6 .
Table 16-6. External Bus Interface Configuration
Pins
1
1
Refer to Chapter 12, “External Bus Interface (EBI) ,” since some signals are not implemented on all devices.
Function After
Device Reset
Function and Value After BAM Execution
Serial Boot Mode
2
or
Internal Boot Mode
2
These values are for serial boot mode only when entered directly using the BOOTCFG signals.
External Boot
with no Arbitration
3
(Single-master Mode)
3
If serial boot is entered indirectly from external boot mode because a valid RCHW was not found, the EBI remains configured
according to these columns.
External Boot
with External Arbitration
3
(Multi-master Mode)
Function Function Function
PCR
Value
Function
PCR
Value
ADDR[8:31] GPIO GPIO ADDR[8:31] 0x0440 ADDR[8:31] 0x0440
DATA[16:31] GPIO GPIO GPIO or
DATA[16:31]
4
4
If the BAM reads a valid RCHW with the PS0 bit clear, DATA[16:31] are reconfigured from GPIO to data bus signals by writing
0x0440 to the pad configuration registers (PCRs).
Default or
0x1440
4
GPIO or
DATA[16:31]
4
Default or
0x1440
4
DATA[0:15] GPIO GPIO DATA[0:15] 0x0440 DATA[0:15] 0x0440
TEA GPIO GPIO GPIO Default
5
5
The BAM does not write to the PCR for this signal; the value is the PCR default value. Refer to Chapter 6, “System Integration
Unit (SIU) ” for the signal PCR default values.
GPIO Default
5
CS[0] GPIO GPIO CS[0] 0x0443 CS[0] 0x0443
CS[1:3] GPIO GPIO GPIO Default
5
GPIO Default
5
WE/BE[0] GPIO GPIO WE[0] 0x0443 WE/BE[0] 0x0443
WE/BE[1:3] GPIO GPIO GPIO Default
5
GPIO Default
5
OE GPIO GPIO OE 0x0443 OE 0x0443
TS GPIO GPIO TS 0x0443 TS 0x0443
TA GPIO GPIO GPIO Default
5
GPIO Default
5
RD_WR GPIO GPIO GPIO Default
5
GPIO Default
5
BDIP GPIO GPIO GPIO Default
5
GPIO Default
5
BB GPIO GPIO GPIO Default
5
BB 0X0443
BG GPIO GPIO GPIO Default
5
BG 0X0443
BR GPIO GPIO GPIO Default
5
BR 0X0443
TSIZ[0:1] GPIO GPIO GPIO Default
5
GPIO Default
5