MPC8536E-ANDROID Freescale Semiconductor, MPC8536E-ANDROID Datasheet - Page 685

• Manufacturer Part Number: MPC8536E-ANDROID
• Description: HARDWARE/SOFTWARE ANDROID OS
• Manufacturer: Freescale Semiconductor
• Series: PowerQUICC ™r
• Type: MPUr

Specifications of MPC8536E-ANDROID

• Contents: Board
• For Use With/related Products: MPC8536
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Each memory bank (chip select) can be assigned to any of these three types of machines through the
machine select bits of the base register for that bank (BRn[MSEL]), as illustrated in
match occurs, the corresponding machine (GPCM, FCM, or UPM) then takes ownership of the external
signals that control the access and maintains control until the transaction ends.
13.4.1
The following subsections describe the basic architecture of the eLBC.
13.4.1.1
The defined base addresses are written to the BRn registers, while the corresponding address masks are
written to the ORn registers. Each time a local bus access is requested, the internal transaction address is
compared with each bank. Addresses are decoded by comparing the 17 MSBs of the address, masked by
ORn[AM], with the base address for each bank (BRn[BA]). If a match is found on a memory controller
bank, the attributes defined in the BRn and ORn for that bank are used to control the memory access. If a
match is found in more than one bank, the lowest-numbered bank handles the memory access (that is, bank
0 has priority over bank 1).
13.4.1.2
The local bus uses a multiplexed address/data bus. Therefore the eLBC must distinguish between address
and data phases, which take place on the same bus (LAD pins). The LALE signal, when asserted, signifies
an address phase during which the eLBC drives the memory address on the LAD pins. An external address
Freescale Semiconductor
Basic Architecture
Address and Address Space Checking
External Address Latch Enable Signal (LALE)
Bank Select
Comparator
MPC8536E PowerQUICC III Integrated Processor Reference Manual, Rev. 1
Address
Figure 13-29. Basic Operation of Memory Controllers in the eLBC
MSEL
Field
32-bit Physical
RAM Address (A)
32-bit System
Address
Internal Memory Access Request Select
UPM A/B/C
Signals Timing Generator
External Signals
FCM buffer
RAM
FCM
GPCM
Enhanced Local Bus Controller
Figure
13-29. If a bank
13-43