Cabletron Systems ESXMIM Installation Manual page 19

Parts of the ESXMIM
SDRAM SIMM Slot
The ESXMIM motherboard provides the option of upgrading memory
capacity by using Single In-line Memory Modules (SIMMs).
The ESXMIM comes with 4 Megabytes (MB) of Shared Dynamic
Random Access Memory (SDRAM). SDRAM holds packets coming onto
the module temporarily while forwarding, filtering, and error checking
decisions are made.
LDRAM SIMM Slot
The ESXMIM comes with 4 MB of Local Dynamic Random Access
Memory (LDRAM). LDRAM is the "Main" memory from which the
switching functionality of the ESXMIM operates.
FLASH Memory SIMM Slot
The ESXMIM incorporates 2 MB of FLASH Electrically Erasable
Programmable Read Only Memory (FLASH EEPROM). FLASH
memory holds the operating instruction code of the ESXMIM. When the
module is activated, the instruction code (firmware) held in FLASH
memory is forwarded to Main memory, decompressed, and used to startup
the ESXMIM.
The use of FLASH memory, in conjunction with the runtime download
capabilities of the ESXMIM, allows for the downloading of firmware to
the module without requiring that the module be shut down. The firmware
download may be performed at any time during the operation of the
module, and the new firmware image will be utilized at the next reset of
the module.
Dip Switch Bank
The ESXMIM provides a bank of eight dual-position, or "dip" switches.
Several of these switches are used for testing purposes during the
manufacturing process. The dip switches can also be used to clear the
NVRAM of the ESXMIM which contains configuration and local
management settings, or to force the ESXMIM to request a new firmware
image from a properly configured BOOTP server.
ESXMIM/ESXMIM-F2 Installation Guide 2-5