TIP255 User Manual Issue 1.0.6
Page 6 of 13
1 Product Description
The TIP255 is an IndustryPack
®
compatible module that offers an easy and reliable way to implement
2 Mbytes of SRAM memory with battery backup.
The 2 Mbyte SRAM is organized in two banks, each bank is providing 512k x 16 bit memory. For all
SRAM devices battery backup is provided by an on board lithium cell. During normal operation
(standard 5V supply applied to the SRAM’s) the capacity of the lithium cell is monitored every 24
hours by the battery monitor device. In addition an interrupt is generated if the battery voltage is too
low. The battery monitor device switches the power supply of the SRAM’s from the standard 5V to the
battery if the 5V drop below the threshold level of the battery monitor device. At this point any active
access to the SRAM’s is executed correctly within 1.5 µs. After this time further accesses to the
SRAM’s are not possible.
Accesses to the TIP255 SRAM memory occur within the IP memory space. The IP I/O space holds the
Interrupt Control Register, the Interrupt and Battery Status Register and the Interrupt Vector Register.
Industry
Pack
I/O
Interface
Pack
logic
Interface
Industry
ID-PROM
4 Mbit SRAM
(512 Kbyte)
Local
Control
Logic
Bank1
1 Mbyte SRAM
16 bit wide
Bank2
Local +3.3V
1 Mbyte SRAM
16 bit wide
4 Mbit SRAM
(512 Kbyte)
4 Mbit SRAM
(512 Kbyte)
4 Mbit SRAM
(512 Kbyte)
Nonvolatile
SRAM Controller
Battery
Figure 1-1 : Block Diagram
CAUTION! - This system contains a lithium battery. Lithium batteries may explode if
mishandled.
Please refer to chapter “Security Warning (Lithium Battery)”.
