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参数资料
| 型号： | MPC8272ADS |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 63/158页 |
| 文件大小： | 0K |
| 描述： | KIT DEVELOPMENT MPC8272 |
| 标准包装： | 1 |
| 类型： | MPU |
| 适用于相关产品： | MPC8272 |
| 所含物品： | 板 |
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E2PROM Memory
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 2 PROM in the BPS field which is the Boot Port Size - the E 2 PROM is 8 bits while the
FLASH is 32 bits.
5.7.1
Flash Programming Voltage
Support is given to 5V- and 12-V programmable modules. The selection between V PP
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 PP is
applied to the Flash SIMM.
5.8
E 2 PROM Memory
The MPC8272ADS is provided with 8KBytes of E 2 PROM memory in a PLCC package.
The E 2 PROM resides on a socket in case it is desired to replace or re-program a different
configuration for the board. The E 2 PROM is used only for the purpose of supplying the
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 2 PROM differs from the one stored in the FLASH in the BPS field which is the Boot Port
Size - the E 2 PROM is 8 bits while the FLASH is 32 bits. It uses a single chip-select, CS0
or CS4, which depends on the chip-select used by the Flash. The selection of the chip-select
The device used is ATMEL AT28HC64B, a 5-V Byte alterable E 2 PROM, 150ns access
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
Chapter 5. Module Design
相关PDF资料 |
PDF描述 |
|---|---|
| MPC8308-RDB | BOARD REF DESIGN MPC8308 |
| MPC8309-KIT | KIT EVALUATION FOR MPC830X |
| MPC8315E-RDB | PROCESSOR BOARD PWRQUICCII PBGA |
| MPC8349E-MITX-GP | KIT REFERENCE PLATFORM MPC8349E |
| MPC8349E-MITXE | BOARD REFERENCE FOR MPC8349 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC8272CVR | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MPC8272 PowerQUICC II Family Hardware Specifications |
| MPC8272CVRB | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications |
| MPC8272CVRE | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications |
| MPC8272CVRI | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications |
| MPC8272CVRM | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications |
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