Service manual

The XMI Corner is located on the <REFERENCE>(xma2) module and
contains interface logic.
The memory control gate array transfers data between the XMI Corner
and the DRAMs. The memory control gate array also controls address
multiplexing, command decoding, arbitration, and CSR logic functions.
Address and control logic modifies address bits received from the XMI
Corner. These modified address bits are used to control the selection of
the DRAMs during reading and writing.
Memory is arranged in two or four banks of DRAMs. Each bank contains
either 155 or 299 DRAMs on each memory module.
The data in the EEPROM is used to initialize the memory control gate array.
After a power-up or system reset, the data in the EEPROM is loaded into
the memory control gate array.
MS65A Memory 6–7