Rev. 1.43
User's
Guide
13
2
Peripherals description
The VSBC-6862 offers a wide choice of on-board peripheral or bus interface, which makes this board
very versatile. Most of these peripherals comes either directly from the processor interface, like the
serial ports, or from other interface unit, like the real time clock calendar.
The following sections will describe these peripheral features.
2.1. FLASH memory
Two banks of 4 or 8 MBytes Flash memory devices are available, for a total of 8 or 16 MBytes Flash.
Each Flash bank is formed by a group of two 16-bit devices, which provide a resulting 32-bit bus
interface for efficient instruction program storage.
Each bank is controlled by the Chip Select 0 (CS0) or Chip Select 2 (CS2) signal.
The Flash memory bank connected to the Chip Select 0 is the boot device. This bank must contain
both ResetWord used by the PowerQUICC II configuration and the boot code.
The VSBC-6862 provides a 'Bootbank' jumper to provide the ability to invert the CS0 and CS2 signals,
thus inverting the bootable Flash memory bank.
One Flash memory bank is also shared with the VME bus. This permits an external master to
reprogram the VSBC-6862 Firmware or use this memory as non-volatile device.
This device is command set compatible with JEDEC standard E
2
PROMs.
Commands are written to the command register using standard microprocessor write timings. Register
contents serve as input to an internal state-machine, which controls the erase and programming
circuitry.
2.2. SDRAM memory
This memory is handled by the powerful SDRAM timing machine contained in the MPC-8260.
The Chip Select 1 is used to control this memory.
The SDRAM machine provides an interface to synchronous DRAMs, using SDRAM pipelining, bank
interleaving, and back-to-back page mode to achieve the highest performance. This controller
supports directly all the SDRAM possibilities, like pipelining and interleaving.
The VSBC-6862 is supplied with 128 MBytes SDRAM on-board, organized with four 16 Mbitsx16
devices.
The 64 bits wide data bus is directly connected on the 60x bus of the MPC-8260 to achieve the best
performance.
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