MPC8308CVMAFD Vs MPC8308CVMAFDA Hi, We would like to seek your technical expertise regarding the following part numbers: MPC8308CVMAFD MPC8308CVMAFDA Could you please clarify whether there are any differences between these two part numbers? According to the datasheet, the additional letter “A” indicates a revision level. However, we could not find any further information explaining the specific revision or its impact on the device. We would appreciate your confirmation on whether these two part numbers are electrically and functionally equivalent and interchangeable. Thank you very much for your assistance. Re: MPC8308CVMAFD Vs MPC8308CVMAFDA ### 1. Difference Between the Two Part Numbers The only difference between **MPC8308CVMAFD** and **MPC8308CVMAFDA** is the **internal silicon stepping / revision**: * **`MPC8308CVMAFD`**: Represents **Silicon Revision 1.0**. * **System Version Register (SVR):** `0x8101_0110` * **`MPC8308CVMAFDA`**: Represents **Silicon Revision 1.1** (the trailing letter **“A”** designates Rev 1.1 in Freescale/NXP’s part numbering scheme). * **System Version Register (SVR):** `0x8101_0111` Both devices share identical nominal parameters: * **Package:** 473-pin MAPBGA (19 mm × 19 mm, 0.8 mm pitch) * **Temperature Grade:** Extended / Industrial (`C` = -40°C to 105°C $T_j$) * **Core Frequency:** 333 MHz (`AF`) * **DDR Data Rate:** 266–333 MHz (`D`) * **Lead-free / RoHS:** Pb-free MAPBGA (`VM`) --- ### 2. Hardware Equivalence (Form, Fit, Function) * **Electrically & Mechanically:** **100% Pin-to-Pin and Drop-in Equivalent.** * No PCB layout, schematic, routing, power supply, or decoupling changes are required. * Ball assignments, voltage rails ($V_{DD} = 1.0\text{V}$, $G_{VDD} = 1.8\text{V}$, $N_{VDD} = 3.3\text{V}$), I/O drive strengths, and AC/DC timing specifications are identical. --- ### 3. Silicon Differences & Software Impact Silicon Revision 1.1 (`MPC8308CVMAFDA`) was released to incorporate minor internal bug/errata fixes over Revision 1.0. For 99% of applications, **Rev 1.1 is fully backward-compatible with Rev 1.0**. However, keep the following two software considerations in mind: 1. **System Version Register (SVR) Checks:** * If your bootloader (U-Boot), kernel, or proprietary firmware explicitly reads and matches the exact 32-bit SVR value: * Rev 1.0 returns `0x8101_0110` * Rev 1.1 returns `0x8101_0111` * Ensure any hardware revision checks in your code mask out or accept the lower 4 bits (e.g., matching against `0x8101_011x` or checking $\ge \text{Rev } 1.0$) so the boot sequence does not halt. 2. **Silicon Errata Workarounds:** * Several known errata present in Rev 1.0 were resolved or improved in Rev 1.1 (documented in the *MPC8308 Chip Errata*, document `MPC8308CE`). * Software workarounds implemented in firmware for Rev 1.0 will continue to operate harmlessly on Rev 1.1. --- ### Summary Recommendation **MPC8308CVMAFDA is the direct, recommended replacement for MPC8308CVMAFD.** They are form, fit, and functional drop-in replacements. You can safely substitute `MPC8308CVMAFDA` without board redesign, provided your firmware does not hardcode an exact match check on the SVR register.
記事全体を表示