PXR40RM Datasheet, PDF (297/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Boot Assist Module (BAM)
9.5.6.2 EBI Configuration for multiplexed Address and Data Development Bus
Boot Mode
The BAM program sets up EBI related registers as shown in the Table 9-13.
Table 9-13. Development Bus/EBI Register Settings multiplexed mode.
Register
Function
Value
Comments
EBI_MCR
EBI_CAL_BR0
EBI_CAL_OR0
SIU_PCR259-
SIU_PCR262
SIU_PCR305-
SIU_PCR307
SIU_PCR263–
SIU_PCR277
SIU_PCR257
SIU_PCR278-
SIU_PCR293
SIU_PCR256
SIU_PCR295
SIU_PCR297
SIU_PCR298
SIU_PCR299
EBI_CAL_BR0
The following registers are programmed when RCHW[PS0] = 1
—
0x0000_0806 AD multiplexed mode, small port size use D16-31
—
0x2000_0883 Sets the base address to 0x2000_0000,16-bit wide
bus, AD multiplexed mode, burst Inhibit
—
0xFF80_00F0 Set 15 wait states, 8MB
D_ADD[12:15],
0x440
Set pads to 20pf drive strength
D_ADD[9:11]
D_ADD_DAT[16:30]
0x840
Set pads to 20pf drive strength
D_ADD_DAT[31]
D_ADD_DAT[0:15]
0x440
Set pads to 20pf drive strength
D_CS0
0x443
Set pads to 20pf drive strength and pull-up enable
D_WE0
D_OE
D_TS
D_ALE
The following register is reprogrammed when RCHW[PS0] = 0
—
0x2000_0083 Sets the base address to 0x2000_0000,32-bit wide
bus, AD multiplexed mode, burst Inhibit
If the boot memory device is 32 bit wide, the RCHW must be programmed in two first half-words of the
memory because when the MCU tries to read RCHW, the EBI is configured to use data lines 16–31 for
16-bit port accesses.
9.5.7 Enabling Debug of a Censored Device
When a device is in a censored state, the debug port (JTAG/Nexus) is disabled and only JTAG BSDL
commands can be used. Access to the Nexus/JTAG clients on a censored device requires inputting the
proper password into the JTAG Censorship Control Register during reset.
NOTE
When the debug port is enabled on a censored device, it is enabled only until
the next reset.
Figure 9-8 shows the logic that enables access to Nexus clients in a censored device using the JTAG port.
Freescale Semiconductor
PXR40 Microcontroller Reference Manual, Rev. 1
9-17