NXP Semiconductors MPC5566 - Page 669

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