TVME8240 User Manual Issue 1.2.9
Page 11 of 70
2 Description
2.1 Processor
The TVME8240 uses the Motorola MPC8240 Embedded PowerPC processor.
2.2 Local Memory Bus
The TVME8240 uses the MPC8240 integrated memory controller for accessing the local memory
devices.
The TVME8240 provides the following devices on the local memory bus:
•
Board mounted Memory FLASH (8 Mbyte, 64 bit wide)
•
Socket Boot FLASH (1Mbyte, 8 bit wide)
•
SDRAM memory (64 Mbyte, 64 bit wide)
•
NVRAM (8 Kbyte, 8 bit wide) / Real-Time Clock / Watchdog (M48T59 compatible)
•
16550 compatible Dual UART (8 bit wide)
•
Utility Registers (8 bit wide)
2.2.1 FLASH Memory
The TVME8240 provides two banks of FLASH memory:
•
Bank 0 consists of two 32-pin PLCC sockets each populated with a 512 K x 8 bit FLASH device for
a total of 1 Mbyte 8 bit wide Boot FLASH.
•
Bank 1 consists of four 1 M x 16 bit on board FLASH devices providing a total of 8 Mbyte 64 bit
wide Memory FLASH.
2.2.2 SDRAM Memory
The TVME8240 provides four 8 M x 16 bit SDRAM devices, building up 64 Mbyte 64 bit wide SDRAM
memory.
2.2.3 NVRAM / Real-Time Clock
The TVME8240 uses an ST M48T59 compatible device to provide 8 KB of non-volatile static RAM and
real-time clock.
The M48T59 device consists of two parts:
•
A 28-pin 330mil SO device which contains the RTC, 8 Kbyte SRAM and sockets for the Snaphat
battery.
•
A Snaphat battery that is placed on top of the device.
Please refer to the M48T59 manual for details.
