MPC8272ADS Freescale Semiconductor, MPC8272ADS Datasheet - Page 63

• Manufacturer Part Number: MPC8272ADS
• Description: KIT DEVELOPMENT MPC8272
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8272ADS

• Contents: Board
• For Use With/related Products: MPC8272
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

As can be seen in Figure 5-6, the FLASH CS is distributed to four CS signals. The
distribution depends on the size of the FLASH module installed - it is read by the BCSR
using the PD(1-7) pins.
The Hard-Reset configuration word stored in the FLASH differs from the one stored in the
E
FLASH is 32 bits.
5.7.1
Support is given to 5V- and 12-V programmable modules. The selection between V
voltage levels is done with a dedicated jumper. To avoid inadvertent programming or
erasure of the Flash, Motorola recommends leaving the jumper open so that no V
applied to the Flash SIMM.
5.8
The MPC8272ADS is provided with 8KBytes of E
The E
configuration for the board. The E
Reset Configuration Word during power-on reset and for storing the PCI configuration
data. It is used as a back-up for the Flash memory in case the Flash is not installed or the
data it holds is incorrect. As a back-up, it holds the default Hard-Reset configuration word
and the default PCI configuration. The Hard-Reset configuration word stored in the
E
Size - the E
or CS4, which depends on the chip-select used by the Flash. The selection of the chip-select
is done by a dip-switch. The E
The device used is ATMEL AT28HC64B, a 5-V Byte alterable E
time with byte-wide JEDEC pinout. Although the device is placed in a socket, it can be
programmed onboard. In order to program the device onboard, it must be unlocked - it can
be locked to prevent unauthorized alterations of its contents. The lock can be done by
hardware or software. The hardware lock is done by write inhibit - the MPC8272 does not
assert WE during write cycles (set in the BRx register). The software lock is achieved by
writing a unique sequence to the device. To unlock, a different unique sequence has to be
written
2
2
PROM in the BPS field which is the Boot Port Size - the E
PROM differs from the one stored in the FLASH in the BPS field which is the Boot Port
2
PROM resides on a socket in case it is desired to replace or re-program a different
E
Flash Programming Voltage
2
2
PROM is 8 bits while the FLASH is 32 bits. It uses a single chip-select, CS0
PROM Memory
2
PROM connection scheme is shown in Figure 5-7.
Chapter 5. Module Design
2
PROM is used only for the purpose of supplying the
2
PROM memory in a PLCC package.
2
PROM is 8 bits while the
2
PROM, 150ns access
E2PROM Memory
PP
PP
is