Using the SRAM Interface with AT90S/LS8515 and ATmega161

When using the SRAM interface with devices placed in the STK500 board, some additional straps are required. The reason is that the RD, WR and ALE signals are not on the same port pins for the AT90S8515/ATmega161(L) and ATmega103(L)/ ATmega128(L), so these signals must be routed manually using two of the 2-wire cables.

Table 1. Signal Routing Required for AT90S8515A and ATmega161(L)
Connections STK500 STK501 Description
Write Signal WR PD6 PG0 Connect PD6:STK500 to PG0:STK501
Read Signal RD PD7 PG1 Connect PD7:STK500 to PG1:STK501
Address Latch Enable ALE PE1 PG2 Connect PE1:STK500 to PG2:STK501
Figure 1. Enabling SRAM Interface for Devices in STK500

Parent topic: Using the STK501 top module