User Guide

NSD-5
3. System Module PAMS Technical Documentation
Page 12 Nokia Corporation Issue 1 05/02
Table 1 illustrates the signal characteristics of the interface. Also see the MAD4 Techni-
cal Specification (Reference 1) for decoding memory map and chip selects.
Figure 4: Memory interface
Signal
Level (V)
Low High
Functional description
MEMAD(21:0) < 0.62 > 2.24 MCU/DSP address bus to external memory
MEMDA(15:0) < 0.62 > 2.24 MCU/DSP bidirectional data bus to external
memory
MEMRDX < 0.62 > 2.24 Read strobe to external memory
MEMWRX < 0.62 > 2.24 Write strobe to external memory
ROM1SELX < 0.62 > 2.24 FLASH chip select
ROM2SELX < 0.62 > 2.24 Not used
RAMSELX < 0.62 > 2.24 SRAM chip select
EEPROMSDA < 0.62 > 2.24 EEPROM serial data